The configuration is the same as the original award-winning Rogers AB1, where each subwoofer functions as a stand for the partnering LS3/5A.

Each active subwoofer utilises two Rogers LS3/5A bass units. Each bass unit is mass loaded with a specific resin to lower the resonant frequency and stiffen the bextrene cone. Stiffening the cone dramatically improves the low-frequency definition and bass attack of the subwoofer system, greatly enhancing low-level spatial detail.

*AB3a will work with all LS3/5A speakers.

Each subwoofer cabinet is constructed from 12mm birch plywood (the same cabinet material used in our award-winning Classic LS3/5A speakers) and houses a 50 Watt mono amplifier.

Each amplifier is adjustable for gain, frequency and phase response. Depending on the speaker position and room acoustics, the amplifier can be tailored to match the listening room acoustic perfectly.

The recommended connection is via the high-level Speakon input. Speakon connection leads are supplied with the subwoofers for ease of connection. Simply plug in the Speakon connector to the amplifier and connect the other end of the lead to the main systems power amplifier speaker terminals.

Supplied in a black satin finish with matching plinths, the Rogers AB3a’s greatly enhance the performance of any LS3/5A speaker system and is compatible with both the 15 Ohm and 11 Ohm versions.

Rogers AB3a Active Subwoofer Specifications

· Woofers: 2 x Rogers Mass loaded LS3/5A woofers per AB3a
· Amplifier: 50 Watt Class B transistor amplifier
· Frequency cut range: 40Hz-220Hz
· High level: Speakon gain input ( lead supplied)
· Phase control: 0-180 Degrees
· Standard Finish: Satin Black
· Rear Grille: Black Tygan
· Dimensions: H 60cm x W19cm x D16.5cm
· Weight: 11Kg (each AB3a)

+ Rogers LS3/5A / LS3/5A SE speakers sold separately

Artykuł Rogers AB3a Active Subwoofer pochodzi z serwisu Rogers HiFi.

Meet the E20a/ii. The first in a new series of valve amplifiers from Rogers.

Originally conceived in 1995, the original Rogers E20a’s raison d’etre was to drive the Rogers LS3/5a loudspeakers to the highest possible sound quality, perfectly blending the „then“ modern digital era with the pure sonics of Class A and valve technology.

Fast forward to 2020 and Rogers have extensively revised the original E20a into the new E20a/ii to perfectly complement the new „Reborn“ LS3/5a Classic and LS5/9 Classic loudspeakers.

Based around the existing circuit and Push-Pull 6L6 output valves, the new E20a/ii has an updated circuit design and still operates in pure class A to provide a vivid, dynamic and wholly musical performance.

Handmade in the UK at Rogers

• Non-magnetic aluminium Chassis and lid; minimising eddy currents for improved sound quality

• All surfaces are anodised for high quality and long life.

• Larger higher quality output transformers deliver increased dynamics and phenomenal bass response.

• Silver-plated output speaker terminals ensure optimum signal transfer to loudspeakers.

• Gold plated, chassis-mounted phono sockets, hard-wired; for optimum low-level signal transfer.

• Hard-wired LCOFC loom ensures the most natural sonic performance.

• Decoupled PCB mountings minimise microphonic resonances, improving dynamic response.

• High quality selected components for the best possible sound quality and reliability.

• 18mm thick CNC machined anodised aluminium front panel; for maximum chassis rigidity.

• Sleek cosmetic re-design of chassis; for a striking visual appearance.

• Remote control provided allows easy volume adjustments.

• Available in two versions: Line and Phono.

• 

• Faithful to the music

  Following such an extensive revision, its no wonder that the new Rogers E20a/ii delivers a simply sublime sonic performance regardless of music genre. Key to its overall performance is preserving the natural structure and tone of the music. A great number of audio products focus on micro detail that they miss the musical message, effectively bleaching it out. The new E20a/ii is natural, dynamic, utterly captivating, with striking visuals to match.

  Like the original, the E20a/ii will quickly become a collector’s item and enjoyed by music lovers everywhere.

Inputs: MM Phono/L1, Line 2, Line 3, Line 4
Outputs: Optional Line out
Type: Push Pull Cathode Follower
Output Power: 18 Watts per channel Class A at 8 Ohms 1KHz 3% THD
Bias: Self Biasing
Frequency Response: 20Hz-20KHz +/- 0.5dB
Input Sensitivity: Phono 6mV Line 150mV
Matching Output: Impedance 8 Ohms
Input Impedance: Phono 47K Ohms Line 100K Ohms

Valves
Output: 4 x 6L6GT
Phase Splitter: 2 x 6SN7
Anode Follower: 1 x 12AX7
Phono Stage: 2 x 12AX7
Power Consumption: 160 Watts
Fuse Ratings: 240V Supply, 1A surge resistant | 120V Supply, 3.15A surge resistant
Weight: 13Kg Net 15Kg Gross
Dimensions (H x W x D): 160 x 450 x 390mm, 160 x 450 x 450mm (inc knobs/sockets)

Artykuł AMPLIFIER Rogers E20a/II <br /> <b>MADE IN HEAVEN</b> pochodzi z serwisu Rogers HiFi.

Für den LS5 / 9 haben wir eine passende Panzerholzbasis entworfen, die ab November erhältlich sein wird.

Reservierungen können heute vorgenommen werden. Jede Reservierung wird mit 10% Rabatt belohnt.

Der Lautsprecherständer ist wie rote High Heels auf einem formschönen Bein. Eigentlich ist es nicht bekannt – ist das Bein ein Accessoire zu Schuhen oder eine notwendige Ergänzung zum Bein?
Hauptsache, schöne Beine in schönen Filzstiefeln machen Eindruck.
Bei Lautsprechern ist dieser Eindruck außergewöhnlich. Der Schall erreicht Sie aus der richtigen Höhe und der Lautsprecher ist zusätzlich gegen unerwünschte Resonanz geschützt.

Artykuł Rogers speaker stands for LS5/9 speakers – Lautsprecherständer pochodzi z serwisu Rogers HiFi.

Meticulously manufactured in the UK to traditional BBC standards

· Constructed from the finest 9mm Russian Birch plywood
· All joints are hardwood battened with beech fillets
· Balanced real wood veneers
· Cabinet walls critically damped with bituminous damping panels
· Beautiful black Tygan grille
· Walnut, Rosewood, and Olive finish as standard
· Other finishes to special order, please ask

The smallest of details don’t make a small difference, they make all the difference

· Single wire, 4mm Multi-Contact sockets
· Sockets are silver-plated for the best connection
· Choice of beautiful real-wood veneers
· Cabinets handbuilt by master-craftsman
· Standard finishes: rosewood, walnut and olive

True to the source, true to the listener

With its high-frequency level adjustment (set by resistor jump links) for optimum pair matching, the Rogers LS5/9 Classic speakers are perfect for monitoring use in the mastering studio as they are for those who want the finest music reproduction at home.

Sometimes what you cannot see, is just as important as what you can

· Latest version of the 34mm Audax HD34 Tweeter
· Tweeter has been adapted by Rogers with the addition of a dispersion loading protective plate
· Midrange and Bass are handled by a Rogers specified 210mm woofer
· Critically flared polypropylene Mid/Bass cone is terminated by an inverted half roll of select vinyl
· Hand-finished and pair-matched in the UK

Not everything that matters can be measured, so listening to every element matters too

· Single layer one-ounce copper track fibreglass PCB
· High-quality dividing network uses ten reactive elements
· High-quality dividing network uses 17 resistors
· High voltage Metalised capacitors
· All components hand soldered with silver solder
· High-frequency level is set by resistor jump links:
– Ensures optimum pair matching
– Eessential for monitor use

LS5/9 Specifications

· System type: Two way bass reflex
· Tweeter: Audax 34mm with phase correction
· Mid/Bass: Rogers 210 mm polypropylene cone vinyl surround
· Crossover: 3KHz 27 precision element 18dB per Octave
· Sensitivity: 89dB for 1W at 1M
· Nominal Impedance: 8 Ohms
· Power handling: 100 Watts unclipped
· Maximum SPL: 106 dBA typical in room
· Cabinet: 9mm Birch plywood hardwood battens
· Grille: Black Tygan
· Finish: Walnut, Rosewood and Olive
· Connections: Stereo pair 4mm banana sockets
· Dimensions: 460mm x 275mm x 285mm (HxWxD)
· Weight: 12Kg (each speaker)

Artykuł Rogers LS5/9 Classic pochodzi z serwisu Rogers HiFi.

LS3/5A 70th Anniversary 2018 VERY LIMITED EDITION – Universally accepted as “the reference for miniature systems” the Rogers LS3/5a 70th Anniversary ‚limited‘ Editon grade two monitor delivers a wholly exceptional degree of tonal accuracy

Specifically designed for broadcasting environments where space is at a premium, each speaker is matched to within one dB of a BBC standard. Within the domestic environment, the LS3/5a delivers a performance of unparalleled purity, its balance being ideally suited to classical material.

The 70th Anniversary edition harps back to the original 15 Ohm design, later design was 11 Ohm…so the 70th Anniversary uses the original transformer type inductors with the special addition of WBT bi-wire speaker terminals rear plaque and signed certificate. A limited run of 210 pairs, 3 x 70 ( 70 pairs for Asia, 70 for EU and 70 for ROW) is scheduled, the first 70 pairs have been sold… the second production run is due in June 2018 and the third run October 2018. Finish Rosewood red.

Artykuł LS3/5A 70th Anniversary 2018 VERY LIMITED EDITION pochodzi z serwisu Rogers HiFi.

Rogers LS3/5a XLR BBC Monitor Speaker

XLR Connector

The speaker cable will have some form of colour coding or ribbing on the insulating material as to which conductor is „+“ positive. For the left speaker solder the + conductor to the XLR connector pin number 2 and solder the other connector negative to the XLR connector pin number 3. Then connect the other end of the lead to the amplifier output for left hand channel, take care to ensure that the „+“ conductor is connected to the „+“ or red connector of the amplifier and that the other conductor is connected to the or black connector of the amplifier.

Repeat the procedure for the right-hand speaker.

If on audition the sound lacks bass and the image is vague, then one of the speakers

has been wired up out of phase, check both speaker and amplifier connections to ensure that the red „+“ from the amplifier is connected to the speaker XLR pin 2. Connecting the speakers out of phase will not damage you amplifier or speakers in any way.

The speakers can be supplied in a specially adapted aluminum case – Cat.No. LS3/5a XLR Alu BOX)

Introduction

Thank you for choosing to purchase Rogers loudspeakers. We are confident that these loudspeakers will provide you with high quality sound and music reproduction for many years.

Please read the short section of this manual headed ‚Quick Installation’. It contains essential information to enable you to get your speakers up and running safely.

To obtain the maximum performance and benefit your new speakers can bring, please take time to read the remainder of this manual and to familiar yourself with the speakers. You will find the rest of this manual contains helpful advice on connecting-up, matching equipment, room placement and maintenance.

Rogers – over half century of excellence

In 1947, an armed forces communications engineer turned his expertise to audio amplifiers. Jim Rogers took up a license to produce the Williams mono valve amplifier thus founding the company.

In the early years Rogers was best known for its amplification products but by 1954 could boast a complete ‚Junior‘ system comprising amplifier, AM tuner and compact loudspeakers. The 1960s were dominated by the launch of stereo and the Rogers stereo ‚Cadet‘ integrated amplifier become a world best seller.

Loudspeaker development at Rogers included unique horn-loaded designs, and even a wall hanging system called the ’Wafer¹ that was well ahead of the times. The transistor revolutionized the entire communications / entertainment world and Rogers was on of the first manufacturers to offer transistor products including the famous Ravensboume and Ravensbrook stereo amplifiers and tuners.

Transistor amplifiers offered ever more power and the focus of development passed to loudspeaker materials prompting the BBC to begin extensive research into monitor speakers for studio use. Fundamental acoustic research and scaling techniques produced the compact LS3/5a that become a benchmark product used throughout the broadcast industry in a wide variety of monitoring situations. Rogers took up a license to produce the LS3/5a and began to produce speakers of its own using the latest polymer materials derived from BBC research. Still innovating, Rogers now uses the world’s first carbon fibre dome tweeter.

In 21st century, Rogers has been continuing its spirit in developing the high-end audio product to reproduce the most natural sound reflecting every details of the original recordings. To celebrate the sixties history, Rogers specially works with BBC again to launch the new LS3/5a limited edition to satisfy the needs of the global audiophiles.

Quick Installation

Unpack your loudspeakers carefully and retain the packing for possible future use.

Position you speakers approximately where you want them and select cable runs of appropriate length.

Switch off the amplifier. Check the Bi-wire links are in place between the terminal on the rear of each speaker. Deal with each channel separately. Identify the left speaker of the pair as the speaker on the left when viewed from the listening positions.

Connect the black terminal on the amplifier left channel (possible marked ‚ negative‘ or with a symbol) to the black terminal on the left loudspeaker. Connect the red terminal on the amplifier left channel (possibly marked positive or with a ‚+‘ symbol) to the red terminal on the left loudspeaker. Make the connections to the upper pair of terminals marked HF.

Repeat these connections for the right channel. Check the integrity of the connections and that there are no shorted wires. Turn down the volume and switch on the amplifier. Select a known source and turn up the volume cautiously.

Details of how to check for phase and polarity, channel identification and the benefits of bi-wiring and bi-amping can be found later in this booklet.

Unpacking

Always unpack speakers with care so as not to damage the finish. It is always advisable to open the packaging at one end, invert the carton with the open flaps folded back so the loudspeaker is standing on the floor. Then remove the packaging from the loudspeaker. Care should be taken with larger or heavier models to avoid back or muscle strain. Get someone to help you if you are in any doubt. Retain all the packaging materials in case you need to transport the speakers later.

Connecting up your system

Cables

Connecting cables have an important effect on final sound quality. Similar lengths of good quality speaker cable should be used. Your dealer can advise you of suitable cables for your installation. Longer cable runs will generally require heavier gauge cables.

All system connections should be clean and tight. Cleaning of all signal path connections in your system is recommended annually. Simply breaking and remaking each connection ensuring a positive contact is all that is needed.

Conventional wiring

Switch off the amplifier. Never make or break any connection with the amplifier powered or with the volume turned up.

Leave the Bi-wire links fitted between the input terminals in place. Take each channel separately to avoid confusion. First, identify the amplifier left channel. You will be connecting these terminals to the left loudspeaker, this is the speaker on the left as seen from the chosen listening position.

HF: High Frequency LF: Low Frequency

Connect the black terminal on the amplifier left channel (possibly marked ’negative‘ or with a ‚-‚ symbol) to the black terminal on the left loudspeaker. Make the connections to the upper pair of terminals marked HF. Your speaker cable maybe ribbed or overprinted along on conductor to help with wiring up. Now connect the red terminal on the amplifier left channel (possibly marked ‚positive‘ or with a ‚+‘ symbol) to the red terminal on the left loudspeaker. Repeat this process for the right channel with the second length of cable. Refer to the diagrams.

Bi-wiring

Rogers loudspeakers feature split crossovers to allow for bi-wiring. This can improve the overall sound quality for the cost of a second set of cables. Bi-wiring keeps the low frequency ground currents from modulating the higher frequency signals int he trebles ‚leg‘ of the crossover network. The split crossover design permits the mid/treble and bass sections to be fed separately.

Two lengths of four-core bi-wire cable or additional lengths of your existing cable are required.

HF: High Frequency LF : Low Frequency

Switch off the amplifier. You may find it helpful to label the cables before starting to wire up the system. Label one pair of cables HF and one pair LF. Remove the Bi-wire links from between the speaker terminals and store them in case you wish to revert to conventional wiring at any point in the future.

Take each channel separately. Connect the black terminal on the amplifier left channel (possibly market ’negative‘ or with a ‚-‚ symbol) to the black HF terminal on the left loudspeaker. Make certain your connection is to the upper pair of terminals market HF. Your speaker cable maybe ribbed or over-printed along one conductor to help with wiring up. Now connect the red terminal on the amplifier left channel (possibly marked ‚positive‘ or with a ‚+‘ symbol) to the red HF terminal on the left loudspeaker.

Repeat this process for the cable pair you have marked LF connecting the same amplifier terminals but making the connections on the left speaker to the lower pair of terminals also market LF. Refer to the diagrams.

Repeat for the HF and LF right channel connections.

Bi-amping

Bi-amping uses separate full bandwidth power amplifier to drive the separate HF (high frequency) and LF (low frequency) legs of the crossover network and appropriate drivers.

Two lengths of four-core bi-wire cable or additional lengths of your existing cable are required.

HF: High Frequency

Switch off the amplifier. You may find it helpful to label the cables and power amplifiers before starting to wire up the system. Label one pair of cables HF and one pair LF. Remove the shorting links from between the speaker terminals and store them in case you wish to revert to conventional wiring at any point in the future. Designate one amplifier High (HF) and one Low (LF).

Take each channel separately. Connect the black terminal on the HF amplifier left channel (possibly marked ’negative‘ or with a ‚-‚ symbol) to the black HF terminal on the left loudspeaker. Make certain your connection is to the upper pair of terminals marked HF. Your speaker cable may be ribbed or over-printed along one conductor to help with wiring up. Now connect the red terminal on the HF amplifier left channel (possible marked ‚positive‘ or with a ‚+‘ symbol) to the red HF terminal on the left loudspeaker.

It is easier at this stage to wire up the right channel for the HF amplifier connecting the black terminal on the HF amplifier right channel (possibly marked ’negative‘ or with a symbol) to the black HF terminal on the right loudspeaker. Then connect the red terminal on the HF amplifier right channel (possibly marked ‚positive‘ or with a ‚+‘ symbol) to the red HF terminal on the right loudspeaker.

Repeat these four connections using the cable pair you have marked LF connecting the left and right LF amplifier terminals to the lower pair of terminals, also marked LF, on the left and right speakers. Refer to the diagrams.

Power ratings

Rogers speakers are designed to present an easy load to the amplifier and, to make the most of the power available, they are efficient enough to produce reasonable sound pressure levels even with lower powered amplifiers.

Because our drive units and crossover networks are conservatively rated and constructed using the latest high technology materials the finished speaker has very high technology materials the finished speaker has very high-power handling capabilities. The recommended amplifier range reflects this lower efficiency and upper power handling limits in offering a range of powers that will suit each model. Room size will influence choice. Installations in larger rooms will require amplifiers from the upper end of the range to produce wholly satisfactory sound levels, while in small rooms an amplifier near the minimum recommended power rating will be able to produce adequate volumes.

Loudspeakers are rarely damaged by being overdriven by large amplifiers, a low powered amplifier used at a high volume setting is much more likely to damage your loudspeakers due to the amplifier ‚clipping‘ the music signal and creating a ’spray‘ of high level, high frequency distortion that can rapidly bum out a tweeter or midrange driver voice coil. It is preferable to use a 200 watt amplifier cautiously at half power into 100 watt rated loudspeakers than it is to run a 50 watt amplifier at full volume into the same speakers.

Phasing

It is important to observe the correct polarity when you wire up your system. There are two areas of concern – channel identification and phase.

Correct channel connections should ensure that the left amplifier channel is connected to the left speaker (the speaker on the left as seen from the listening position). A test CD, record or tape can be used to identify the correct channels.

It is recommended that you connect positive terminals on the amplifier to positive terminals on the speaker, ie. red to red and black to black. Reversing the connections on both channels achieves a reversal in absolute phase. This may mean that the speaker bass cone moves backwards rather than forwards on the transient or beginning of a bass note. Come listeners are sensitive to this effect. You should note that absolute phase will differ from recording to recording and sometimes between amplifiers. You may wish to experiment.

Positioning

The correct frequency response (tonal balance) is achieved from your loudspeakers with their grilles in place. Removal of the grilles will compromise high and mid frequency performance.

Loudspeakers should never be placed tightly in the comers of rooms. Though this dramatically increases the bass in one frequency band, it produces a cancellation ’suck-ouf in the next. Though certain types of music may be artificially enhanced, the effect is very unnatural as can be heard in reproduced speech as a ‚boomy‘ or congested quality.

Placing stand mounted speakers on the floor will create a similar effect.

If speakers have to be placed close to the comers of a room they should be place asymmetrically with respect to the two walls, that is at a different distance from the side and rear wall. Careful listening and experimentation with positions can minimize the effects of room reflections on bass reinforcement and cancellation.

Reflections at higher frequencies from any large flat sound-reflecting surface (wall, mirror, furniture) can adversely affect stereo imaging. Soft furnishings and fabrics can be used to change reflections if the speakers can conveniently be repositioned

Caring for your loudspeaker

The real wood veneers used on certain models can be maintained by regular dusting and gentle cleaning with furniture polish and a soft cloth. Over use of waxy polishes may change the colour of the veneers.

The high-quality synthetic veneers chosen for some Rogers loudspeaker systems will retain their appearance for many years if dusted regularly and cleaned periodically with furniture polish. Spray polish onto the cloth. Do not spray polish onto the loudspeaker as this may damage the drive units.

Grille cloth is best kept clean with a length of sticky tape wrapped around the hand adhesive side out or with a clean soft brush. Do not use undue pressure as you may damage the drive units beneath the grille.

Warning

Rogers loudspeakers should not be connected to any amplifier which exceeds the recommended amplifier requirements, as stated within the individual model specifications.

Artykuł Rogers LS3/5a XLR <br />BBC Monitor Speaker pochodzi z serwisu Rogers HiFi.

Rogers Monitor 1 65th Anniversary Edition

Artykuł Rogers Monitor 1 <br />65th Anniversary Edition pochodzi z serwisu Rogers HiFi.

Rogers AB-1 Auxiliary Bass One Subwoofer specialy designed for the legendary LS3/5a Monitor Speaker to extend the range of low frequency, sensitivity and reduce overall impedance by presenting an easier load for the amplifier. The easy to connect design allows you to install the system quickly and enjoy unparalleled audio playbeck.

New edition – soon.

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Artykuł Rogers AB-1 <br />Auxiliary Bass One Subwoofer pochodzi z serwisu Rogers HiFi.

Rogers LS3/5a Speaker Monitor 65th Anniversary Edition

Standmount Speaker
Iconic and Timeless Design
Worldwide Acclaim
Multiple Award Winner
Beautiful Construction
2-way Configuration

Introduction

Thank you for choosing to purchase Rogers loudspeakers. We are confident that these loudspeakers will provide you with high quality sound and music reproduction for many years.

Please read the short section of this manual headed ‚Quick Installation’. It contains essential information to enable you to get your speakers up and running safely.

To obtain the maximum performance and benefit your new speakers can bring, please take time to read the remainder of this manual and to familiar yourself with the speakers. You will find the rest of this manual contains helpful advice on connecting-up, matching equipment, room placement and maintenance.

Rogers – over half century of excellence

In 1947, an armed forces communications engineer turned his expertise to audio amplifiers. Jim Rogers took up a license to produce the Williams mono valve amplifier thus founding the company.

In the early years Rogers was best known for its amplification products but by 1954 could boast a complete ‚Junior‘ system comprising amplifier, AM tuner and compact loudspeakers. The 1960s were dominated by the launch of stereo and the Rogers stereo ‚Cadet‘ integrated amplifier become a world best seller.

Loudspeaker development at Rogers included unique horn-loaded designs, and even a wall hanging system called the ’Wafer¹ that was well ahead of the times. The transistor revolutionized the entire communications / entertainment world and Rogers was on of the first manufacturers to offer transistor products including the famous Ravensboume and Ravensbrook stereo amplifiers and tuners.

Transistor amplifiers offered ever more power and the focus of development passed to loudspeaker materials prompting the BBC to begin extensive research into monitor speakers for studio use. Fundamental acoustic research and scaling techniques produced the compact LS3/5a that become a benchmark product used throughout the broadcast industry in a wide variety of monitoring situations. Rogers took up a license to produce the LS3/5a and began to produce speakers of its own using the latest polymer materials derived from BBC research. Still innovating, Rogers now uses the world’s first carbon fibre dome tweeter.

In 21st century, Rogers has been continuing its spirit in developing the high-end audio product to reproduce the most natural sound reflecting every details of the original recordings. To celebrate the sixties history, Rogers specially works with BBC again to launch the new LS3/5a limited edition to satisfy the needs of the global audiophiles.

Quick Installation

Unpack your loudspeakers carefully and retain the packing for possible future use.

Position you speakers approximately where you want them and select cable runs of appropriate length.

Switch off the amplifier. Check the Bi-wire links are in place between the terminal on the rear of each speaker. Deal with each channel separately. Identify the left speaker of the pair as the speaker on the left when viewed from the listening positions.

Connect the black terminal on the amplifier left channel (possible marked ‚ negative‘ or with a symbol) to the black terminal on the left loudspeaker. Connect the red terminal on the amplifier left channel (possibly marked positive or with a ‚+‘ symbol) to the red terminal on the left loudspeaker. Make the connections to the upper pair of terminals marked HF.

Repeat these connections for the right channel. Check the integrity of the connections and that there are no shorted wires. Turn down the volume and switch on the amplifier. Select a known source and turn up the volume cautiously.

Details of how to check for phase and polarity, channel identification and the benefits of bi-wiring and bi-amping can be found later in this booklet.

Unpacking

Always unpack speakers with care so as not to damage the finish. It is always advisable to open the packaging at one end, invert the carton with the open flaps folded back so the loudspeaker is standing on the floor. Then remove the packaging from the loudspeaker. Care should be taken with larger or heavier models to avoid back or muscle strain. Get someone to help you if you are in any doubt. Retain all the packaging materials in case you need to transport the speakers later.

Connecting up your system

Cables

Connecting cables have an important effect on final sound quality. Similar lengths of good quality speaker cable should be used. Your dealer can advise you of suitable cables for your installation. Longer cable runs will generally require heavier gauge cables.

All system connections should be clean and tight. Cleaning of all signal path connections in your system is recommended annually. Simply breaking and remaking each connection ensuring a positive contact is all that is needed.

Conventional wiring

Switch off the amplifier. Never make or break any connection with the amplifier powered or with the volume turned up.

Leave the Bi-wire links fitted between the input terminals in place. Take each channel separately to avoid confusion. First, identify the amplifier left channel. You will be connecting these terminals to the left loudspeaker, this is the speaker on the left as seen from the chosen listening position.

HF: High Frequency LF: Low Frequency

Connect the black terminal on the amplifier left channel (possibly marked ’negative‘ or with a ‚-‚ symbol) to the black terminal on the left loudspeaker. Make the connections to the upper pair of terminals marked HF. Your speaker cable maybe ribbed or overprinted along on conductor to help with wiring up. Now connect the red terminal on the amplifier left channel (possibly marked ‚positive‘ or with a ‚+‘ symbol) to the red terminal on the left loudspeaker. Repeat this process for the right channel with the second length of cable. Refer to the diagrams.

Bi-wiring

Rogers loudspeakers feature split crossovers to allow for bi-wiring. This can improve the overall sound quality for the cost of a second set of cables. Bi-wiring keeps the low frequency ground currents from modulating the higher frequency signals int he trebles ‚leg‘ of the crossover network. The split crossover design permits the mid/treble and bass sections to be fed separately.

Two lengths of four-core bi-wire cable or additional lengths of your existing cable are required.

HF: High Frequency LF : Low Frequency

Switch off the amplifier. You may find it helpful to label the cables before starting to wire up the system. Label one pair of cables HF and one pair LF. Remove the Bi-wire links from between the speaker terminals and store them in case you wish to revert to conventional wiring at any point in the future.

Take each channel separately. Connect the black terminal on the amplifier left channel (possibly market ’negative‘ or with a ‚-‚ symbol) to the black HF terminal on the left loudspeaker. Make certain your connection is to the upper pair of terminals market HF. Your speaker cable maybe ribbed or over-printed along one conductor to help with wiring up. Now connect the red terminal on the amplifier left channel (possibly marked ‚positive‘ or with a ‚+‘ symbol) to the red HF terminal on the left loudspeaker.

Repeat this process for the cable pair you have marked LF connecting the same amplifier terminals but making the connections on the left speaker to the lower pair of terminals also market LF. Refer to the diagrams.

Repeat for the HF and LF right channel connections.

Bi-amping

Bi-amping uses separate full bandwidth power amplifier to drive the separate HF (high frequency) and LF (low frequency) legs of the crossover network and appropriate drivers.

Two lengths of four-core bi-wire cable or additional lengths of your existing cable are required.

HF: High Frequency

Switch off the amplifier. You may find it helpful to label the cables and power amplifiers before starting to wire up the system. Label one pair of cables HF and one pair LF. Remove the shorting links from between the speaker terminals and store them in case you wish to revert to conventional wiring at any point in the future. Designate one amplifier High (HF) and one Low (LF).

Take each channel separately. Connect the black terminal on the HF amplifier left channel (possibly marked ’negative‘ or with a ‚-‚ symbol) to the black HF terminal on the left loudspeaker. Make certain your connection is to the upper pair of terminals marked HF. Your speaker cable may be ribbed or over-printed along one conductor to help with wiring up. Now connect the red terminal on the HF amplifier left channel (possible marked ‚positive‘ or with a ‚+‘ symbol) to the red HF terminal on the left loudspeaker.

It is easier at this stage to wire up the right channel for the HF amplifier connecting the black terminal on the HF amplifier right channel (possibly marked ’negative‘ or with a symbol) to the black HF terminal on the right loudspeaker. Then connect the red terminal on the HF amplifier right channel (possibly marked ‚positive‘ or with a ‚+‘ symbol) to the red HF terminal on the right loudspeaker.

Repeat these four connections using the cable pair you have marked LF connecting the left and right LF amplifier terminals to the lower pair of terminals, also marked LF, on the left and right speakers. Refer to the diagrams.

Power ratings

Rogers speakers are designed to present an easy load to the amplifier and, to make the most of the power available, they are efficient enough to produce reasonable sound pressure levels even with lower powered amplifiers.

Because our drive units and crossover networks are conservatively rated and constructed using the latest high technology materials the finished speaker has very high technology materials the finished speaker has very high-power handling capabilities. The recommended amplifier range reflects this lower efficiency and upper power handling limits in offering a range of powers that will suit each model. Room size will influence choice. Installations in larger rooms will require amplifiers from the upper end of the range to produce wholly satisfactory sound levels, while in small rooms an amplifier near the minimum recommended power rating will be able to produce adequate volumes.

Loudspeakers are rarely damaged by being overdriven by large amplifiers, a low powered amplifier used at a high volume setting is much more likely to damage your loudspeakers due to the amplifier ‚clipping‘ the music signal and creating a ’spray‘ of high level, high frequency distortion that can rapidly bum out a tweeter or midrange driver voice coil. It is preferable to use a 200 watt amplifier cautiously at half power into 100 watt rated loudspeakers than it is to run a 50 watt amplifier at full volume into the same speakers.

Phasing

It is important to observe the correct polarity when you wire up your system. There are two areas of concern – channel identification and phase.

Correct channel connections should ensure that the left amplifier channel is connected to the left speaker (the speaker on the left as seen from the listening position). A test CD, record or tape can be used to identify the correct channels.

It is recommended that you connect positive terminals on the amplifier to positive terminals on the speaker, ie. red to red and black to black. Reversing the connections on both channels achieves a reversal in absolute phase. This may mean that the speaker bass cone moves backwards rather than forwards on the transient or beginning of a bass note. Come listeners are sensitive to this effect. You should note that absolute phase will differ from recording to recording and sometimes between amplifiers. You may wish to experiment.

Positioning

The correct frequency response (tonal balance) is achieved from your loudspeakers with their grilles in place. Removal of the grilles will compromise high and mid frequency performance.

Loudspeakers should never be placed tightly in the comers of rooms. Though this dramatically increases the bass in one frequency band, it produces a cancellation ’suck-ouf in the next. Though certain types of music may be artificially enhanced, the effect is very unnatural as can be heard in reproduced speech as a ‚boomy‘ or congested quality.

Placing stand mounted speakers on the floor will create a similar effect.

If speakers have to be placed close to the comers of a room they should be place asymmetrically with respect to the two walls, that is at a different distance from the side and rear wall. Careful listening and experimentation with positions can minimize the effects of room reflections on bass reinforcement and cancellation.

Reflections at higher frequencies from any large flat sound-reflecting surface (wall, mirror, furniture) can adversely affect stereo imaging. Soft furnishings and fabrics can be used to change reflections if the speakers can conveniently be repositioned

Caring for your loudspeaker

The real wood veneers used on certain models can be maintained by regular dusting and gentle cleaning with furniture polish and a soft cloth. Over use of waxy polishes may change the colour of the veneers.

The high-quality synthetic veneers chosen for some Rogers loudspeaker systems will retain their appearance for many years if dusted regularly and cleaned periodically with furniture polish. Spray polish onto the cloth. Do not spray polish onto the loudspeaker as this may damage the drive units.

Grille cloth is best kept clean with a length of sticky tape wrapped around the hand adhesive side out or with a clean soft brush. Do not use undue pressure as you may damage the drive units beneath the grille.

Warning

Rogers loudspeakers should not be connected to any amplifier which exceeds the recommended amplifier requirements, as stated within the individual model specifications.

Artykuł Rogers LS3/5a <br />Speaker Monitor <br />65th Anniversary Edition pochodzi z serwisu Rogers HiFi.

Dear Marek,

Andy will produce Rogers E20a amplifier first and the sample first launch in Japan October show. I will update any information to you at ASAP.

Best Regards,
Ng Chi Kwan

Senior Sales & Marketing Manager
Electrical Appliances Group
Wo Kee Hong Group

2018-08-26 20:30

Artykuł Rogers E20a <br />Stereo Integrated Valve Amplifier pochodzi z serwisu Rogers HiFi.