Philips 22 AH 585, Instructions For Use Manual

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English
Introduction
This electronic two-way loudspeaker enclosure is
based on the motional feedback (MFB) principle.
The enclosure incorporates two power amplifiers
and an electronic regulator and control system.
The heart of the control system is a piezo-electric
element incorporated in the apex of the woofer
cone, which monitors the cone acceleration and
converts it into an electrical voltage. This voltage,
which is proportional to the cone acceleration, is
fed into a comparator circuit where it is accurately
compared with the original amplifier input signal.
Despite some fine loudspeaker designs, it has
never been possible to achieve ideal cone
movement, since both the uniformity of the
magnetic field in which the speech coil moves and
the freedom of movement of the cone have
absolute limits. These imperfections, which are
very difficult to eliminate, result in distorted bass
reproduction.
In the MFB system, any voltage difference
detected by the comparator is fed back to the
loudspeaker, via the amplifier, as a correction
signal. The loudspeaker is thus forced to
reproduce the original input correctly. Not only is
the bass distortion corrected but, in addition, the
low frequencies present in the original signal are
reproduced with the correct relative amplitudes.
Use of the motional feedback principle has made it
possible to reproduce even the lowest notes
naturally and powerfully by means of relatively
small enclosures.
Although the continuously variable input sensitivity
makes it possible to connect the enclosures to any
pre-amplifier or power amplifier, it is advisable to
use them only in combination with amplifiers
having an equivalent specification.
Accurate, active cross-over networks and the
adjustable filters ensure a smooth and flat
frequency characteristic, the specification of the
MFB loudspeaker box surpassing by far the
requirements laid down in the HiFi standard, DIN
45500.
Controls, connections, etc. (at the rear)
•
mains lead
‚
power on / off switch
ƒ
voltage adapter (in special versions only)
„
adjustment controls (for factory adjustment
only)
…
input sensitivity control