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Frequency correction facilities were the LOW filter which reduced rumble on records (12 dB per octave at 80 Hz) and the HI filter which damped hiss (12 dB per octave at 4000 Hz). With the LOUDNESS control you could switch between objective and subjective linear reproductions. Beomaster 4000 had facilities for stereo and ambio reproduction. There were sockets for a record player and two tape-recorders, one allowing A\B monitoring. The headphone connection was placed on the receiver’s front. All inputs could be adjusted to give equal volume from all programme sources. The FM section had six pre-set stations. A light indicator assisted accurate tuning and an illuminated meter indicated the strength of a station. Field effect transistors, ceramic filters and integrated circuits were used.

When combined with a built-in record deck, the music centre was known as Beocenter 3500.

Receivers and amplifiers with the ambio function were products which, apart from stereo, could also reproduce the ambience or sound information of a room. Ambient information was included on most stereo vinyl recordings but could not be reproduced by a sound system with two loudspeakers or an ordinary stereo amplifier. Bang & Olufsen systems with the ambio function had facilities which electronically subtracted the difference signal (i.e. the difference between left and right channels) which contained ambient information. This information was fed into two extra loudspeakers which were placed as side speakers in a room. Ambiophony was an extension of stereo reproduction and enhanced the sense of realism. It could be used with nearly all stereo programme materials.

“Ambio is an extension of the type of sound reproduction known today as stereo.

Ambio is reproduced through four loudspeakers – two more than required for stereo.

Ambio is sensed as being more spatial and acoustically more life-like than conventional stereo. The sound picture has greater depth because you get the added feeling of being present of the concert hall, listening to the actual performance. Ambio is based on the principle that in the concert hall you not only receive sound impressions directly from the performing group, you also get reflections from the wall and ceiling. The spatial sensation is instrumental in providing the auditory experience and even a two-speaker stereo system will not bring it out fully. And you cannot accomplish the effect by connecting additional speakers to a conventional stereo amplifier because you still have the same left and right front signals merely distributed to more speakers.

In the Beomaster 4000 the left and right channels are subtracted from each other electronically and the resulting difference signal contains a certain amount of spatial information which is fed to the two new side speakers.



Denna vara sparar 102 kg CO₂e vilket motsvarar produktionen av 5 nya jackor.

Stockholm

Huddinge

Bang&Olufsen Beomaster 4000 Stereo Förstärkare 

Ånej!

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