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BeoMaster 2400

Bang & Olufsen BeoMaster 2400-2

Beomaster 2400 together with Beomaster 1900 were two advanced FM stereo receivers. They had identical technical specification and performance. Both were easy to use and easy to live with.

Beomaster 2400 had the additional convenience of a cordless ultrasonic remote control module by which you could operate radio, amplifier and Beogram 2400 or 4004 record decks from a distance. Both receivers had touch-sensitive controls for operating the features and functions you used every day. All the secondary switches and adjustments were protected beneath a hinged lid, but an illuminated readout panel showed you the set’s operational status at a glance.

Equipped with the slim remote-control module you could select between four pre-set radio stations or record player input, adjust the volume up or down or put the System into Stand-by. The illuminated panel with its large display allowed to to easily see the state of play from anywhere in the room. The phase-locked loop decoder ensured a wide separation between stereo channels and remained stable over a very long lifetime. When a stereo broadcast was received, a symbol ‘S’ lit up automatically on the fascia of the set. Automatic Frequency Control (AFC) kept the selected radio station spot on tune, and a muting circuit cut out inter-station noise during tuning.

The stereo amplifier produced 2 x 30 watts RMS of high-fidelity output and had DIN sockets for the connection of two pairs of speakers, a record-player and a tape or cassette recorder.

A headphone connection was provided beneath the front edge of the unit. Controls not needed every day were situated beneath a hinged lid. These included tone and balance adjustment, FM pre-setting, loudness, AFC and MONO/STEREO switches, and a switch for selecting a basic initial volume level. This facility allowed you to choose the volume at which the amplifier began to play each time it was switch on – no matter how controls were left the previous time. On its primary control panel Beomaster 2400 had no knobs or buttons. The panel functioned electronically and needed only the contact of your finger to activate it. However, the ultrasonic remote control would have proved more useful. The set’s sophisticated indicator system would tell you instantly that your commands had been obeyed.

Beomaster 2400 was superceded by Beomaster 2400-2 in 1980.

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BeoMaster 2400-2

Bang & Olufsen BeoMaster 2400-2

Beomaster 2400 together with Beomaster 1900 were two advanced FM stereo receivers. They had identical technical specification and performance. Both were easy to use and easy to live with.

Beomaster 2400 had the additional convenience of a cordless ultrasonic remote control module by which you could operate radio, amplifier and Beogram 2400 or 4004 record decks from a distance. Both receivers had touch-sensitive controls for operating the features and functions you used every day. All the secondary switches and adjustments were protected beneath a hinged lid, but an illuminated readout panel showed you the set’s operational status at a glance.

Equipped with the slim remote-control module you could select between four pre-set radio stations or record player input, adjust the volume up or down or put the System into Stand-by. The illuminated panel with its large display allowed to to easily see the state of play from anywhere in the room. The phase-locked loop decoder ensured a wide separation between stereo channels and remained stable over a very long lifetime. When a stereo broadcast was received, a symbol ‘S’ lit up automatically on the fascia of the set. Automatic Frequency Control (AFC) kept the selected radio station spot on tune, and a muting circuit cut out inter-station noise during tuning.

The stereo amplifier produced 2 x 30 watts RMS of high-fidelity output and had DIN sockets for the connection of two pairs of speakers, a record-player and a tape or cassette recorder.

A headphone connection was provided beneath the front edge of the unit. Controls not needed every day were situated beneath a hinged lid. These included tone and balance adjustment, FM pre-setting, loudness, AFC and MONO/STEREO switches, and a switch for selecting a basic initial volume level. This facility allowed you to choose the volume at which the amplifier began to play each time it was switch on – no matter how controls were left the previous time. On its primary control panel Beomaster 2400 had no knobs or buttons. The panel functioned electronically and needed only the contact of your finger to activate it. However, the ultrasonic remote control would have proved more useful. The set’s sophisticated indicator system would tell you instantly that your commands had been obeyed.

Beomaster 2400 was superceded by Beomaster 2400-2 in 1980.

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Beomaster 4401

Bang & Olufsen Beomaster 4401

This was a variant of the Beomaster 4400 but which had a black fascia instead of the aluminium front seen on the Beomaster 4400. It seemed to be designed mainly for the US market but numbers made seem to be few and it has attained almost mythical status amongst European collectors. Bang & Olufsen themselves have not got one in their collection and in fact did not even have a picture.

However the enthusiast is not so easily thwarted! Thanks to the superb investigating powers of Frede Kristenssen of Classic Audio, we present the Beomaster 4401!

A more detailed description will follow once the model has been serviced, but essentially it has the same design and performance as the Beomaster 4400.

Two of these receivers are known to exist and examination would suggest that these were design studies taken to a production level. Some evidence of prototype wiring is present but clearly the parts are anodised in black.

Investigations have not completely uncovered the status of this model. There is one line of thinking which suggests that a number of these were made – in the region of a thousand with the majority going to the United States. However other insiders at B&O suggest that only a handful exist and it would seem that they are now in the hands of enthusiasts.

Reports of a matching Beogram , the 4001, are not backed up by any official data and unlike the Beomaster 4401, no service manual has yet been found.

In use the Beomaster 4401 is no different from a normal 4400. Except in this case the 4401 was restored by Classic Audio. This means that this Beomaster exceeds all the factory specifications.

How does it sound? Very modern despite it being over 30 years old. Lots of power and superb dynamics and extremely neutral. Many Beomasters have a warm slightly veiled sound but this one is a clear as a bell. It works equally well with small and large speakers and is easily able to control the bass on Beovox M100s which are a bit of a handful.

The tuner is a delight, pulling in weak stations with ease though the pre-sets are no easier to use than those on the Beomaster 3000. The geared wheels on the Beomaster 2200 are vastly better.

Connections are limited to DIN sockets – the useful RCA sockets are no longer there. This receiver also was the last to feature ambiophonics and a switch to activate the rear channels was fitted to the rear of the unit where most users would never see it!

In this users opinion, this is the best receiver made by B&O. The later Beomaster 8000 was more powerful but the 8000 is prone to going off specification very quickly due to the use of a particular type of capacitor. Therefore an 8000 in proper fettle is a rare beast indeed.

The 4400 is therefore a hidden gem; clothed in the skin of the lesser 3000 and 4000, it hides its splendour till called upon to play. Buy one now – these are true bargains!

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BeoMaster 8000

Bang & Olufsen BeoMaster 8000

Beomaster 8000 was an advanced FM receiver with a rated output of 2 x 150 watts IHF A-202. It had the power, precision and overall performance to reproduce all types of music with the utmost fidelity.

The radio section united the principle of the modern digital frequency synthesizer tuner with a precise, automatic fine-tuning system to give unparalleled accuracy and long-term stability of reception. The set’s control panel gave instant access to all sound sources – an associated record deck and two tape decks and any of 9 user-programmable FM stations. The visual feedback indicated which sources were playing and their volume settings. Controls for secondary functions were protected beneath a hinged lid.

The infra-red BeoLab Terminal was for its time, complex technology tamed. It gave easy, direct access to music and allowed the control of a musical experience from anywhere in your room and operate Beogram 8002 and Beocord 8004 if these were part of your system. A single touch is all there was between what you wanted and the fulfilment of your wish. Radio programmes, cassettes and records were all available at the touch of a button.

In the early 1980s the technical quality of records, tapes and FM transmissions was vastly improved. Improvement meant increased dynamic range.

Increased dynamic range in sound sources makes great demands on hi-fi components. They must accommodate a greater range of tones: from the very faintest tinkle of a triangle to the loudest roll of the bass drum; and reproduce each tone accurately. This requires powerful, serious hi-fi components. Power to accommodate the dynamics, and accuracy to ensure that the fundamentals and harmonics of each tone are reproduced faithfully, i.e. with the intervals and relative intensity that gives each instrument its characteristic quality.

The 2 x 150 watts RMS Beomaster 8000 high fidelity FM receiver had the power, precision and overall performance level to help you achieve this goal. Up to the time of its introduction, it was Bang & Olufsen’s most accomplished receiver to date. During its construction phase, the company focused on one major goal: that none of its circuits or components should be able to limit or distort the sound signals it received before the amplifier’s power output level was exhausted.

In accordance with this, a special circuit registered, and the “clipping” function indicated when you should regulate volume level, if you wanted to ensure continued undistorted sound. Volume was controlled by a 60-step electronic attenuator. This regulated both channels together, in balance, and allowed precise adjustments.

A digital frequency synthesizer tuner was incorporated. It was a further development of other constructions since this tuner locked stations onto their actual transmission frequencies, rather than using a mere internally-generated frequency reference.

Beomaster 8000 had the most comprehensive user-programmable facilities imaginable. They were placed out of view in the programming compartment because you didn’t need to use them every day. The primary controls were external. To keep you informed, whenever the music system was in use, the status of the primary settings was displayed on the Beomaster’s large communication panel. Beomaster 8000 formed the heart of the Beosystem 8000.

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BeoCenter 2800

Bang & Olufsen BeoCenter 2800

Beocenter 2800 was a unique combination of FM/AM tuner, a 2 x 25 watts RMS hi-fi power amplifier and record player. The tuner section offered Long and Medium wave reception as well as FM. There were facilities for pre-setting the four FM stations you listen to most frequently. Ceramic filters, AFC, split-supply output and a phase-locked loop decoder were some of the features that ensured outstanding reception and reproduction of even distant stations.

The record player was fully automatic – one master switch controlled all operations. The anti-skating device was built into the arms suspension and worked automatically. Electronic Servo Drive (ESD) ensured constantly correct speed. There were sockets for tape deck, two sets of stereo speakers and headphones.

This was a compact, space-saving unit which was easy to use thanks to automatic circuits and logical controls. Beocenter 2800 could be made up as part of the Beosystem 2800, when linked together with other compatible Bang & Olufsen products

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BeoGram 1500 (1978)

Bang & Olufsen BeoGram 1500 1978

Beogram 1500 combined ease of operation and advanced technology in a simple, straightforward way. All its operations were controlled via a single button.

Another advantage of this totally integrated design was its immunity to external shock and vibrations. The electronic servo drive system ensured correct turntable speed at all times. The low-mass arm had built-in bias compensation, and the MMC 20S pickup tracked at only 1,5 grams.

The unique pendulum spring suspension helped make the Beogram range of record players immune to the external shock and vibrations which would cause most other record decks to mistrack and damage the record groove.

Beogram 1500 could be made up as part of the Beosystem 1500, when linked together with other compatible Bang & Olufsen products.

This deck was the basic model of its time but the inherent design of this deck meant that the performance was extremely similar to the top of the range radial decks. Very easy to set up and simple to use, a true bargain buy in later years.

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BeoCord 1900

Bang & Olufsen BeoCord 1900

Beocord 1900 equalled Bang & Olufsen’s top-of-the-line cassette deck (Beocord 5000) in terms of specifications and performance, but it but it did not have the same wide range of facilities and operational refinements.

This does not mean that the Beocord 1900 was difficult to operate. On the contrary, the slanting front panel which contained all the operational facilities made the set’s controls handy and easily accessible. The cassette eject mechanism was air damped so that delivery was gentle and controlled. Two large VU meters enabled accurate setting of recording levels.

The microphones socket was placed discreetly under a sliding panel together with a balance control which enabled signal level adjustment in both channels. All the features which characterised high quality and high performance levels in cassette decks were incorporated. These included a combined recording/play-back Sendust tape head and Dolby B Noise Reduction circuits.

Beocord 1900 used precision techniques that ensured stable tape drive and the highest standards of recording and playback. Yet despite its comprehensive facilities it was easy to use and harmonised comfortably with many different Beosystems.

Beocord 1900 could be made up as part of the Beosystem 1900 or Beosystem2400, when linked together with other compatible Bang & Olufsen products.

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Beovox M150.2

Bang & Olufsen Beovox M150.2

Beovox Uni-Phase MS150 and M150 were Bang & Olufsen’s answer to the need for loudspeakers that could cope with greater dynamic range and increased demand for serious, no-gimmick sound reproduction.

They were B&O’s biggest and most perfected loudspeakers up to the time of their introduction, designed to reproduce sound with a natural, linear phase quality – even at very high sound pressure levels. Their power handling capacities were specified at 150 watts RMS. However, effective overload protection circuits enabled them to handle brief passages of music way above their ratings.

Both speakers reproduced all types of music – from the faintest to the loudest notes – with extreme accuracy and precision, without adding to or subtracting from the signals they received.

In addition, the MS150 was designed to reproduce a clean, powerful bass in a relatively large room. That is why it was fitted with a monitor quality sub-woofer and had a net volume of 64 litres. It reproduced the lowest of tones that any record, tape or FM broadcast could deliver. Apart from the sub-woofer, all other speaker drivers in both models were identical.

Behind this successful design lay a new acoustic technology, an integrated loudspeaker design which put Bang & Olufsen in control of all the parameters that affected the loudspeakers’ performance. That is, all, except the room acoustics in which they were situated.

The new technology was based upon the use of Fourier analysis, computer-aided design and simulation techniques and laser holography. It helped prove measuring, calculating and testing techniques and thereby led to better cross-over filters’ design, refinement of patented linear phase techniques, control cabinet resonances and the minimisation of diffractions caused by the cabinet’s traditionally sharp-edged profiles. There was also a redesigning of the necessary drivers in order to meet precise construction requirements and perform optimally.

A monitor quality sub-woofer, a 20cm bass unit and a 64 litre net cabinet secured clean, powerful, bass reproduction. The mid-range unit, a 7,5cm dome tweeter, was aperiodically tuned to secure the exact frequency response characteristic required, while the super tweeter ensured excellent high frequency response.

Beovox M150-2 featured a 3-unit configuration to ensure monitor-quality sound reproduction in the 38 – 22000 Hz frequency range. Power handling capacity was 150 watts RMS with overload protection on all drive units. The 7,5cm unit acted as a mid-range filler-driver to eliminate audible phase distortion, so the music was always crisp and well defined with individual instruments correctly ‘positioned’ in the musical landscape. Pedestals were included as standard equipment.

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Beovox M150

Bang & Olufsen Beovox M150

Beovox Uni-Phase MS150 and M150 were Bang & Olufsen’s answer to the need for loudspeakers that could cope with greater dynamic range and increased demand for serious, no-gimmick sound reproduction.

They were B&O’s biggest and most perfected loudspeakers up to the time of their introduction, designed to reproduce sound with a natural, linear phase quality – even at very high sound pressure levels. Their power handling capacities were specified at 150 watts RMS. However, effective overload protection circuits enabled them to handle brief passages of music way above their ratings.

Both speakers reproduced all types of music – from the faintest to the loudest notes – with extreme accuracy and precision, without adding to or subtracting from the signals they received.

In addition, the MS150 was designed to reproduce a clean, powerful bass in a relatively large room. That is why it was fitted with a monitor quality sub-woofer and had a net volume of 64 litres. It reproduced the lowest of tones that any record, tape or FM broadcast could deliver. Apart from the sub-woofer, all other speaker drivers in both models were identical.

Behind this successful design lay a new acoustic technology, an integrated loudspeaker design which put Bang & Olufsen in control of all the parameters that affected the loudspeakers’ performance. That is, all, except the room acoustics in which they were situated.

The new technology was based upon the use of Fourier analysis, computer-aided design and simulation techniques and laser holography. It helped prove measuring, calculating and testing techniques and thereby led to better cross-over filters’ design, refinement of patented linear phase techniques, control cabinet resonances and the minimisation of diffractions caused by the cabinet’s traditionally sharp-edged profiles. There was also a redesigning of the necessary drivers in order to meet precise construction requirements and perform optimally.

A monitor quality sub-woofer, a 20cm bass unit and a 64 litre net cabinet secured clean, powerful, bass reproduction. The mid-range unit, a 7,5cm dome tweeter, was aperiodically tuned to secure the exact frequency response characteristic required, while the super tweeter ensured excellent high frequency response.

Beovox M150-2 featured a 3-unit configuration to ensure monitor-quality sound reproduction in the 38 – 22000 Hz frequency range. Power handling capacity was 150 watts RMS with overload protection on all drive units. The 7,5cm unit acted as a mid-range filler-driver to eliminate audible phase distortion, so the music was always crisp and well defined with individual instruments correctly ‘positioned’ in the musical landscape. Pedestals were included as standard equipment.

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BeoVox M75

Bang & Olufsen BeoVox M75

Beovox Uni-Phase M100 and M75 were the top models in the 1979 – 1980 range of Bang & Olufsen speakers.

They reproduced sound with studio monitor quality, which, in practice meant that even at very high sound pressure levels (volume) they reproduced sound with constantly neutral, linear phase quality. They could also withstand hard-working conditions similar to those met in sound studios, because they were effectively protected against damage from overloading. Their power-handling capacities were specified at 100 and 75 watts RMS respectively; however, their unique overload protection circuits permitted them to handle music passages above these rated capacities.

Special emphasis was placed on Beovox M100’s ability to reproduce clean, powerful bass. That it why it was given a ported bass-reflex cabinet with a 30,5cm woofer. The cabinet’s volume was 89 litres. Bass response went down to 27Hz (measured at +/- 4 – 8 dB).

Beovox M75 had outstanding overall performance too, and was equally suitable for medium-sized or larger rooms. Both models had specially-designed pedestals which could be adjusted to the correct listening height and angle.