The RH532 Electronic MFB is an electronic three-way loudspeaker enclosure employing the Philips motional feedback system.
This box, having a volume of 15 litres, incorporates three special loudspeakers, an electronic regulator and control system and two power amplifiers with a total output of 10 Watts (sine wave) - a 40 watt amplifier for the low notes loudspeaker with MFB and a 20 watt amplifier for the middle and high notes loudspeakers.
Incorporated in the cone centre of the low notes loudspeaker is a piezoelectric element (PXE) which monitors the cone acceleration and converts it into an electrical voltage. This voltage is proportional to the cone acceleration and is led into a comparator circuit where it is accurately compared with the original signal supplied to the loudspeaker by the amplifier.
Cone movement does not always accurately correspond to the electrical signal applied to the voice coil. This is due mainly to lack of uniformity of the magnetic field coupling with the coil during large cone excursions and resonances of the cone and of the air enclosed by the loudspeaker box. These effects are particularly apparent in the low frequency region and result in distorted bass reproduction.
The voltage difference. detected by the comparator, is fed back to the loudspeaker via the amplifier as a correction signal, thus the loudspeaker is forced to reproduce the original signal.
Type: 3 way, 3 driver loudspeaker system
Frequency Response: 30Hz to 20kHz
Crossover Frequency: 500, 3500Hz
Bass: 1 x 8" AD8065
Midrange: 1 x 5" AD5060
Tweeter: 1 x 1" AD0160T
Enclosure: 15 litre
Dimensions: 378 x 283 x 212mm
Note: built in amplifiers
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Reviewed Jun 21st, 2014 by turntableguru
If you find them...Grab them!!! Awesome sounding speakers you can use direct with a preamp or paired to another amplifier. The mid and tweets are standard Philips faire, but the woofer. A dual voice-coil servo driven 8 inch driver that is controlled such that ends speaker over excursion. Simply brilliant. Sonic-ally superior in every way to the likes of the LS3/5A producing well defined crisp highs, dead acurate mids and voice and tightly defined bass with exceptional soundstage.