BeoLab 4500 was a wall speaker which was no more than 8cm deep. It had a built-in (active) amplifier and extended bass reproduction, which used the wall as a reflector. The display told you which source that BeoLab 4500 was reproducing at any one time.
There were two versions of this panel loudspeaker. The pure Beovox 4500 loudspeaker (shown here) and BeoLab 4500 with built-in amplifier and Dynamic Bass Equaliser (shown in main picture above), which automatically compensated for the inability of the human ear to perceive deep bass tones at low volume
The design of BeoLab 4500 and Beovox 4500 was based an acoustic principle that allowed the loudspeaker to use the wall to enhance the bass level. The cabinet let the sound waves reflect off the wall and out into the room without delay. This made it possible to reduce the depth of the cabinet to just 8cm, so the loudspeaker becomes a natural part of the wall décor.
BeoLab 4500 had a display which indicated sound source, volume and which track on CD or tape that you were listening to. In looks, it was similar to the BeoLab 5000 active speaker, but smaller. The display too was in a green-coloured LED as opposed to BeoLab 5000’s orange. Both loudspeakers were available with blue or grey fabric.
Quality loudspeakers provide well-modulated sound expression, and at the same time a visual personality that also commands attention. Bang & Olufsen’s BeoLab 3000 and Beovox 3000 loudspeakers had both the voice and the looks for a leading, acoustic role. Because of their thin shape, they became known as Panel loudspeakers.
Panel loudspeakers were one of the most exciting examples of how Bang & Olufsen united advanced technology and stunning design to achieve totally new effects. They didn’t look like high specification loudspeakers,, but their sound gave them away. Even at full volume they kept the total sound picture in perfect balance.
The elegant, flat loudspeakers were designed to be hung on the wall. And with their calm surfaces of blue or grey fabric coupled with beautiful, polished steel they looked like works of art presented in their own right. The idea of the panel speakers was based upon an advanced, acoustic principle that uses the wall as an active part of the sound reproduction, without causing the wall itself to vibrate.
They were available with or without amplifier and display showing which source was playing, at what volume, and which track number on a CD or tape you were listening to.
With display and amplifier the panel, speakers were called BeoLab 3000. Without, they were known as Beovox 3000.
The options depended on which Bang & Olufsen sound system was connected. You obtained maximum utilisation from Beosystems 6500, 4500, 3500 and Beocenters 9500 and 8500.
Why build amplifiers into the loudspeakers instead of keeping them separate?
Because you can reduce the size of the cabinet volume to one-third of the size of a conventional loudspeaker with the same sound capacity.
The principle is called Active Loudspeakers, and what you get is a compact loudspeaker that can play at high volume without distortion or damage to its drive units. Furthermore, when amplifier, treble and bass units are paired for the same task, they can be tailored to compensate for each other’s shortcomings. What you hear is music that sounds exactly like the instrument it originally came from.
Mounting Options
Wall mounting brackets were supplied with this model. No other mounting solution wall offered.
Bang & Olufsen’s preferred supplier for brackets and stands, STBbrackets, have made a range of solutions specifically for this model. Distributed throughout the World by the Bang & Olufsen store network, the STB options add to the diversity of mounting options and positions available.
»Wall Mounting Brackets
Wall Bracket for BeoVox & BeoLab flat panel speaker range
WB3000 has been introduced to meet a growing demand to mount Bang & Olufsen flat panel speakers to the wall. The bracket (sold as a pair) is a faithful reproduction of the original which was supplied with the speakers. These beautiful speakers can now be installed on to the wall, where they are a genuine and authentic Bang & Olufsen statement.
BeoLab 2500 are active loudspeakers designed to match the BeoSound Ouverture and the BeoSound 3000. With their built-in amplifiers, they sound as if they’re three times their size. Hang them on the wall or place them on bookshelves.
They match both the Beocenter Ouverture and 3000 (previous to this they were used with both the BeoSound 2300 and 2500 music systems) with perspective and clarity, despite their modest dimensions. The explanation of the wide sound lies in the built-in amplifiers in each cabinet: one for bass and one for treble, so that they never have to compete for the same amplifier.
Features:
BeoLab 2500 are active loudspeakers with 2 built-in power amplifier modules to combine with the current (2002) BeoSound 3000 and BeoSound Ouverture. As speakers for the BeoSound 2300 and 2500 music systems, they were available in Blue Lapis, Black Granite, Red Garnet, Green Malachite, Yellow Dolomite and Silver Galena. However, new metal frets were introduced at the end of 2001. From the previous replaceable cloth fronts, they are now manufactured in pearlescent aluminium (see below). These new perforated metal frets presently come in 5 different colours – natural aluminium, black, blue, green and russet to match those of BeoSound 1.
“When it comes to sound reproduction we believe there’s only one relevant parameter: How close can we come to the originally recorded sound. We feel an obligation not to disturb the intentions of the artist by adding unnatural elements to the acoustic image. Therefore all Bang & Olufsen loudspeakers share the same goal. They differ in size and shape and in terms of sound pressure level. But they are all developed to reproduce the natural, unaltered sound as closely as possible ” – Bang & Olufsen catalogue 2001 – 2002
Adaptive Bass Linearisation
Adaptive Bass Linearisation (ABL) is a process patented by B&O and is incorporated in BeoLab loudspeakers. The idea is to use the surplus capacity in amplifiers and driver units, arising by normal listening levels, for a bass extension – a sound reproduction with more bass, than the loudspeaker otherwise would be able to produce.
The function is adaptive. This means that the loudspeaker adapts to the signal it receives. Loudspeaker drivers are therefore fully exploited, without suffering mechanical or electronic abuse, and the built in amplifiers are not subjected to signals would otherwise create an overload situation.
ABL gives stunning bass reproduction considering the size of the loudspeaker in which it is incorporated, under normal listening levels.
Mounting Options
BeoLab2500 were originally mounted to the HiFi with wall bracket 2087 or physically separated and mounted onto furniture as a bookshelf option.
Beogram CD 7000 was distinctive because of its authentic sound reproduction as well as its large dynamic range. It was equally suitable for symphonic music and rock. Its many functions allowed you to pre-programme tracks for playback in any desired order. This CD player was the last in line as far as separates were concerned, replaced with the likes of Beocenter 2300 and Beocenter 2500.
Features:
Exclusive computer-controlled CD loading mechanism with extremely fast access time
CD tray machined from a 4mm solid aluminium plate for maximum mechanical stability and convenient loading
Disc tray cut-outs with rubber lining for 12 and 8cm discs
Spring-suspended CD mechanism and magnetic disc clamp
Special functions, such as scan and sequence programming, were carried out from Beolink 7000
Dynamic readout on Beolink 7000 of all functions, track bar, remaining time, elapsed time, scan, etc.
CD players are now among the simplest constructions in the electronic world and standard players are based on very few components, a simple electronic layout and use of economical materials, both inside the product and in the cabinet. In the construction of CD7000 the main objectives were the achievement of excellent mechanical stability, convincing sonic qualities and easy access to the CD functions.
The loading mechanism, the way the clamp function and the suspension of the CD mechanism were all points that received special attention. The high quality of the mechanical solutions was continued in the electronic circuitry and both were highly integrated and interdependent of each other.
The CD tray was very solid and elegant and the loading mechanism extremely durable. The tray was made from a 4mm thick sheet of aluminium and the conical recess for the CD was milled and diamond polished to the smallest of tolerances – to prevent dust gathering in the recess. The circular rubber profile protected the disc during loading and unloading, while the triangular cut-out facilitated unloading. To avoid static build-up the tray was connected to ground and to avoid ‘ringing’, a damping plate was placed at the innermost part of the tray, inside the cabinet.
The motorised movement of the CD tray was very fast and gentle. The movement was controlled by the microcomputer via an optocoupler and was a very stable mechanical solution with two parallel chrome plated brass rail tubes and precision plastic roller bearings. A nylon coated steel cord wire was applied for maximum duration and quiet transport. The electronically governed transport was very smooth, started the movement slowly, then speeded up very quickly, decelerating when the disc approached the clamp. Furthermore, it secured against possible damage occurring from obstacles either in front of the tray or in between tray and cabinet.
While the tray approached the clamp the disc was gently lifted off the tray and clamped between the CD mechanism and magnet. The magnet was placed on a bridge across the CD mechanism and when it engaged the disc the magnet was lifted away from the bridge. While the disc was rotating, the magnet was not in contact with the cabinet, but only the disc and CD mechanism.
This assembly was insulated very efficiently from the cabinet to prevent vibrations from the outside. A special suspension was designed, with 4 steel springs, encased in rubber. The springs ensured that the CD mechanism was fixed in the horizontal plane (i.e. across the disc), while a certain amount of movement was allowed in the vertical plane (i.e. up and down). Test showed that the servo system counteracts movements in the vertical plane better than in the horizontal plane, and the suspension thus was a good compromise with regard to immunity from external vibrations. The inherent frequency of the suspension was placed at 25 Hz to avoid tracking and focusing errors, which were prone to emerge if the CD mechanism was subjected to vibrations around 100 Hz and upward. Furthermore, at this frequency interference with the inherent frequency of the CD cabinet was also avoided.
The electronics
The CD format is one of the most precisely defined audio formats, but it is still possible to design differentiated products. The electronic solutions in CD 7000 were just as elaborate, the computer controlled loading just being one of the elements. Separate power supplies were available for the digital and analogue parts, and in connection with a careful print layout Bang & Olufsen achieved the most respectable electronic specifications. The digital-to-analogue filtering was special as well. First, a standard digital filtering (4 x oversampling) was applied to filter away the sidebands below 176,4 kHz. The analogue filtering at 176,4 kHz was carried out by a modified order filter. To avoid remnants of the 176,4kHz sideband having an effect on the filtering, a special suction circuit cut off the frequencies above 156,4 kHz. The modified filter was known as a ‘Bessel elliptical filter’. It had a very gentle filter characteristic and was not susceptible to ripple phenomena, phase distortion or ageing.
The functions
As with the other sources, operation was via the Beolink 7000, with full display readout of all functions. Special functions available included: the space function, where a pause of 4 seconds was added between tracks to facilitate track search on a tape recorded from CD 7000. Scan gave playback of the first 15 seconds of each track and was especially useful in connection with a sequence programming.
While you were scanning the CD, tracks could either be selected (compiled) or omitted and when the last track had been scanned, playback of the programmed sequence commenced. Sequence programming could also be carried out independently of the scan function and if you used the select programming, playback could be non-chronological. If you used the reject programming to leave out specific tracks, playback would be chronological.
Beogram 7000 could, ideally, be used as part of Beosystem 7000
Like many Bang & Olufsen turntables, Beogram 7000 was designed with a tangential arm, which ensured optimal playing of the record. It also came equipped with the patented OPP system (Optimal Pivot Point), so that the pick-up – MMC2 – was not disturbed by vibrations.
Fully automatic and remote controlled via Beolink 7000
Integrated MMC 2 pickup cartridge
Tangential tonearm with OPP (Optimum Pivot Point)
Pendulum suspended sub-chassis
Built-in RIAA amplifier
By the mid-1990s the CD had rapidly become a replacement for the black vinyl record with many new albums released only in the CD format. This is why Bang & Olufsen ceased production of its record decks, with Beogram 7000 being the last in a very long line of high quality turntables. However, even today the vinyl format is alive, as so many treasured record collections were originally based on the vinyl format in its heyday, with many more of the more esoteric albums still awaiting CD reissue. The requirements that have to be met by a record player have become threefold:
“The preservation of precious vinyl records in as perfect a condition as possible
The ability to pick up information from the grooves and reproduce them faithfully
The operation must be made as similar to the other sources in a system as possible.”
Beogram 7000 met and exceeded all these requirements. The MMC2 pick-up cartridge weighed only 1,6g – the lowest own weight of any pick-up cartridge – and had a very high compliance and low effective tip mass. The result was a very good tracking ability with little record wear and in combination with the contact line nude diamond the optimal contact with the groove walls was ensured – to pick up the full music information. The MMC principle – Moving Micro Cross – gave a high channel separation, especially in the bass range, a low distortion and very little channel difference, which are all elements that significantly contribute to the achieved sound quality.
The MMC cartridge was mounted in a tangential tonearm, which eliminated tracking errors. The unique Optimum Pivot Point and the pendulum suspended sub-chassis made the reproduction virtually immune to vibrations from the outside.
The tonearm’s axis for horizontal movement was positioned behind the vertical axis and thus behind the tonearm’s centre of gravity. If the pivot point for horizontal movements vibrated, the rear part of the arm with the counterweight also vibrated, whereas the stylus remained still, because it was in the centre of the vibrations. The MMC was completely integrated with the tonearm and the low weight of the cartridge meant that the tonearm resonance could be optimised to the ideal value of 10 – 15Hz.
The pendulum suspension efficiently insulated the inner chassis with tonearm and platter from the outer cabinet to prevent vibrations to affect playback. The suspension consisted of three pendulums and leafsprings and gave the inner chassis an inherent resonance of 5 – 6 Hz.
Operation of Beogram 7000 was via Beolink 7000. The turntable automatically determined record size and selected playback speed accordingly (33 or 45 rpm.). If no record was registered, playback did not begin. It was only possible to lower the pick-up cartridge if there was a record on the platter. When you operated Beogram 7000 from Beolink 7000 you could not by accident lower the stylus outside of the record surface. By preventing unauthorised operation of Beogram 7000, Bang & Olufsen gave priority to both the preservation of the pick-up cartridge and the vinyl records.
Beogram 7000 could ideally, be used as part of Beosystem 7000
In design, technology and operating philosophy, the Beogram 9500 turntable was a perfect match for the Beocenter 9500 system.
Using a light-weight MMC2 cartridge, its electronic tangential arm played each record at the exact angle it was cut giving the most precise reading of the grooves ensuring that every nuance of a recording was captured.
The arm was suspended by a patented Bang & Olufsen system which helped prevent vibrations from any source reaching the cartridge. And the chassis suspension acted as an effective buffer against external vibrations.
Beocenter 9300 really defined the word ‘classic’. It was for those who preferred to enjoy the music rather than to pore over the product manual. The design of the 9300 was around for many years before production ceased in the late 1990’s. It was available in many different versions; for example 8000, 9000, 9500 and the this last version: Beocenter 9300.
The differences between the 9500 and the 9300 was that the 9300 had a new and improved CD mechanism fitted which was faster than the previous versions. Some minor differences were that the 9300 lacked two-way remote communication and an equalizer loop-through. However, the 9300 still is still among the Bang & Olufsen greats!
BeoCenter 9300 could operate with active as well as passive loudspeakers. A mere touch activated BeoCenter 9300 and a line of sensi-touch options glowed on the lower glass display. The 9300 was a complete music system for people who prefer to enjoy music rather than poring over a product manual.
Features:
2 x 80 watt amplifier, CD player with programming, tape recorder with auto reverse, FM/AM radio with 30 preset stations, finger touch control, optional Beo4 remote control operation, connections for Beolink® and headphones, Master Control Link. There was also the option of using the BeoCenter with or without active speakers, such as BeoLab 4000 (shown above). A stand could also be bought as a separate item
The mirrored exterior of aluminium and smoked glass gave no hint of the power hidden beneath the surface of Beosystem 9500. Central to the concept was the AM/FM receiver. On the flanks, CD player and cassette recorder awaited their turn in the spotlight. When they were needed, a light touch on the display panel was all that was required to make lids glide to the side giving immediate access to disc or cassette. The Beocenter was designed by Jacob Jensen and was the direct descendant of Beocenter 9000. The two models features here were superceded in 1994 by Beocenter 9300.
Simple logical operation
A light touch directly on Beocenter 9500 was all you needed to access its operation. The illuminated display led you logically through the programming and other functions always showing you what to do next. This ease and simplicity of use was the first impression you obtained of the music system. And equally easy to use was the optional remote control Beolink 1000 terminal.
Entertainment and information from three reliable sources
You could preset up to 20 FM and AM stations on the Beocenter 9500 receiver. And when you made your choice, search and fine tuning were completely automatic. Also, you could preset the receiver to switch on automatically to catch the news, or perhaps a favourite serial at just the right time. If you were out, the cassette recorder could be programmed to record and you could play back at your leisure.
You could also use the Beocenter 9500 receiver as a guaranteed alarm. In the event of a power failure during the night, the clock instantly switched to its own built-in batteries to ensure that you awoke at just the right time.
The CD player which accommodated both 12cm and 8cm compact discs was also ready for your commands. It gave you instant access to a specific track anywhere on the disc and allowed you to change the order in which the tracks were played, or to simply choose only those tracks you wished to listen to. Technology at its most convenient best. When used with Beogram 9500 the music system was known as Beosystem 9500.
