Philips - BX640A Radio
Nr 40714901
Philips - 532 Electronic (the first motional feedback speaker set 1974) - Speaker set
Nr 40714901
Philips - 532 Electronic (the first motional feedback speaker set 1974) - Speaker set
The famous motional feedback from Philips from the primal year 1974.
The very first production model of the MFB system!
Have recently been checked by my Hi-Fi repairman and are working perfectly!
Over the years, Philips has poured motional feedback technology into many guises. From the beautiful retro look of this 532 in the primal year 1974, to the elegant, sleek design speaker F9638 in 1983.
Motional Feedback (MFB) is an active high fidelity speaker system, that was developed by Philips in the mid-1970s.
A speaker system, in which the low-tone speaker emits a counter signal to the built-in amplifier, by means of a ceramic recorder mounted on a cone. This is possible because the cone vibrates isophostic as one stiff whole under 500Hz. The output signal is electronically corrected via the built-in amplifier, making the emitted sound an accurate copy of the audio signal offered.
This corrects not only the distortion, such as resonance and the distortion of the cone suspension, in the loudspeaker, but also the acoustic behaviour of the loudspeaker housing and that of the listening room, where the loudspeaker system is placed, the counter signal is added and thus corrected via the cone recorder.
See photos for the condition of the set.
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