Philips RH-585 Owners manual

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English

which is proportional to the cone acceleration, is

Although the continuously variable input sensitivity

Accurate, active cross

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Suomi Sivu 31

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,

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.

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.

-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

2

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†

channel selector

As these colours may not correspond with the

which is marked with the letter L or coloured Red.
which is marked with the letter N or coloured black.

•

After making sure that power switch

wall socket.

Attention:

way described above. The channel selector

‡ signal input socket right channel
ˆ signal output socket right channel
‰ signal input socket left channel
Š signal output socket left channel

Indicators (on the front, behind cover)

s operating indicator

d stand-by indicator

Location of the loudspeaker enclosures behind
furniture, curtains or heavy textiles should be
avoided, as this has an adverse effect on the
reproduction of treble notes.

• Keep the arrangement as symmetrical as
possible. A certain degree of asymmetry can be
corrected by adjusting the stereo balance control
on the driver unit.

• In the case of ambiophonic reproduction with 4
loudspeaker enclosures the above rules apply
equally to the enclosures behind the listener.

Installation

Checking the mains voltage

First of all make sure that the operating voltage,
indicated on the type plate at the rear, corresponds
to your local mains voltage. if it does not, consult
your dealer.

Note for users in Great Britain

When fitting a mains plug to the mains lead,
please proceed as follows:
The wires in the mains lead are coloured in
accordance with the following code:
Blue = Neutral, Brown = Live.

colour markings identifying the terminals in your
plug proceed as follows:
The brown wire must be connected to the terminal

The blue wire must be connected to the terminal
Note: This apparatus must be protected by a 3

amp fuse if a 13 amp plug is used, or if any other
type of plug is used by a 5 amp fuse either in the
plug or adapter, or at the distribution board. lf in
doubt consult a qualified electrician.

Location of the MFB enclosures

The location of the loudspeakers should be
chosen with care to ensure optimum sound
reproduction. Their acoustic properties largely
depend on the size, shape, upholstery and
furniture of the room in which they are to be
placed. As these conditions differ for every
situation, it is impossible to provide a uniform
solution
The most favourable position can therefore be
determined only by trial and error. The following
hints may be useful.

• The distance between the individual enclosures
should be approximately the same as that
between the listener and the enclosures.

• lf the enclosures are placed in corners, against
the wall or on the floor, the bass reproduction is
reinforced.

Connection to the mains

‚ is in 'off'

position (not-depressed) connect each enclosure
to the mains by plugging the mains plug into the

Connection to the driver unit

Irrespective of the type of amplifier or
preamplifier being used the connections should
be made as follows:
By means of one 2-channel audio signal cable

A connect the right and left signal input sockets

‡ and ‰ of one enclosure to the right and left

output sockets of the driver unit. If your driver
unit has been provided with DIN loudspeaker
sockets, a 5-pole DIN connection socket, or
screw or clamp terminals, use should be made of
adapter B, C or D respectively.
Ensure that the connections for 'right' and 'Ieft'
are not interchanged!
Now connect the right and left signal output
sockets ˆ and Š of this enclosure to the right
and left signal input sockets ‡ and ‰ of the
second enclosure by means of the second 2­channel audio cable A

Without using this interconnection facility it is, of
course, also possible to connect the left and right
channel outputs of your driver unit directly and
separately to the input sockets of each
loudspeaker enclosure by means of only one
lead of both 2-channel audio cables A.

Irrespective of the way of connection

being chosen the channel selector switch † on
each enclosure should be set to the correct
position (read chapter 'Position of switches').

Increasing the power

lf a higher power/channel is required, several
enclosures can be coupled to one another in the

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3

switch on each enclosure should be set to the

watts) to the input sensitivity (in volts) use the

whether power rating is specified for 4 or 8 ohms.

Adjustment controls

After having set the other controls as already

switching on the driver unit an automatic on/off

Adjust sound level with the volume control of your

lf desired the set can, of course, be switched off

in case of
journeys, etc.
damentally from the conventional type by virtue of

AD 70651/MFB4, 7" woofer
AD 01635/T15 dome tweeter

correct position (read chapter 'Position of
switches').

reaches the enclosure. In addition to the green
stand-by indicator d the red 'OPERATING'
indicator s will now light up.

Position of switches

Before switching on the set the various controls
should be set to the correct position.
To discover the optimum setting of these controls
it is advisable to set the stereo balance, treble and
bass controls of the driver unit to the flat (central)
position. Where appropriate, other forms of tone
control (e.g. contour, presence) and filters
(scratch, rumble, etc.) should be switched off.

Input sensitivity control …
The correct setting of this control is important, and
depends upon the output voltage produced by
your driver unit.
If used with a pre-amplifier, control … should be
set to the position which corresponds to the rated
output of the pre-amplifier.
The output of power amplifiers, however, is
normally specified in watts/channel (the DIN HiFi
Standard specifies a distortion of less than 1 % for
a continuous sine wave output at 1000 Hz and into
a load of 4 or 8 Ohm). To relate this output (in

conversion table given on page 29.
Take care to use the correct column, according to

The calibration up to '3 V' is for pre-amplifiers, that
above '3 V' for low, medium or high power
amplifiers.

Channel selector switch †

This switch on the left channel enclosure(s)
should be set to position 'left' and that on the right
channel enclosure(s) to position 'right'.

Since these controls are meant for factory
adjustment only, you are advised to leave these
controls untouched.

Power on / off switch ‚
mentioned, set volume control of your driver unit to

minimum.
Switch on the MFB enclosures by setting power

switch ‚ to the 'on' position (depressed). The
green stand-by indicator d will light up. After

switch will switch on the MFB enclosure within one
second after an audio signal from the driver unit

„

driver unit.
lf no audio signal is received for a period of ap­proximately three minutes, the enclosure will
automatically switch off and indicator s goes out.
In this situation the stand-by circuit is still energized
and the stand-by indicator d keeps on burning.
The power consumption is in this condition
negligible.

fully by setting power switch ‚ to position 'off'.

Electronic protection

To safeguard the MFB loudspeakers and
amplifiers, in the event of overloading or
overheating, the enclosure incorporates electronic
protection circuits, which function fully
automatically.

Operation

• Bass, treble, volume and balance can be
adjusted on the driver unit.

• Even when the driver unit is switched off, MFB
enclosures used in combination with conventional
loudspeaker enclosures, e.g. for ambiophonic
reproduction, may inadvertently be switched on by
a pulse from the loudspeakers of the conventional
systems which effectively act as a microphone. In
this case the MFB enclosures should be switched

off completely by setting power switch ‚ to 'off'
position.

• You are advised to switch off the enclosures
completely with power switch ‚

prolonged absence, such as holidays, long

• The MFB loudspeaker enclosure differs fun­its integrated electronic circuitry. lt should not

therefore be exposed to excessive humidity.

Technical data

(subject to modification)

• Type of enclosure: Motional Feed Back with 2
amplifiers

• Total power of amplifiers: 35 W cont. sine wave

• Loudspeakers:

4

• Cross-over frequency: 1500Hz

• Connection sockets: phono sockets for signal

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