This is a basic, straight forward connection scheme of a
stereo RS-1K system with a subwoofer, in which R-DES
controls the signal being fed to the subwoofer via a
pair of 'Y' jacks. The other side of each 'Y' jack feeds
the Left and Right amplifiers which feed a speaker level
signal to the RS-1K woofer's speaker level input (4). You
then use the jumper cable (supplied with the RS-1K) to
connect the RS-1K's plate amplifier speaker level output
(5) to the PMA speaker terminals.
An optional version of this connection scheme requires
you to connect the Left and Right amplifier speaker wire
to the RS-1K's PMA terminals and then use the jumper
to connect the PMA terminals to the RS-1K plate ampli-
fier speaker level input (4).
What will happen:
1. The RS-1K's PMA will receive a full range signal.
2. The RS-1K's woofer, powered by the on board plate
amplifier will receive a full range signal. You will use
the plate amplifier's variable crossover (1) to select a
roll off point for the woofers, It has been suggested to
select a lower crossover point for the woofers
(approximately 40-50 Hz) to minimize any overlap of the
PMA, woofer and subwoofer. This is a reasonable start-
ing point, but experimentation with the crossover point
is the best advice.
3. The subwoofer(s) will receive both Left and Right full
range signal, through R-DES, which will give you the
ability to design curves with or without a subsonic high
pass filter and boost and cut filters to smooth out the
low frequency response or to contour a curve that suits
your listening pleasure. It is suggested that you should
use the low pass filter of your R-DES instead of the
crossover on your subwoofer's plate amplifier. In this
case, you should disable the subwoofer's crossover or
dial it up all the way to it's highest frequency.
4. A final tweak of relative phase reconciliation should
always be included with any system that combines 2 or
more low frequency producing speakers.
In this scheme, you should have that option on your sub-
woofer and you have a continuously variable phase con-
trol (2) on the RS-1K's plate amplifier. Turn off your
subwoofer, play a test tone at 75 dB SPL that matches
the crossover point you selected on the RS-1K's plate
amplifier (1) and dial in the highest SPL reading of the
phase control, then turn on the subwoofer amplifier and
repeat the process. This should give you a great place
to start creating EQ curves with R-DES.
Here and on the following pages we have illustrated various connection schemes. In the following pages, you will
see a reference to the acronym ‘PMA’. This refers to ‘Progressive Matrix Array’. This is the type of crossover
used in the RS1000 loudspeaker. If you are asked to connect your speaker cable to the PMA, this simply means
connect to the binding posts on the back of the speaker (above the amplifier). If you are asked to turn on your
PMA’s amplifier, this means turn on your main amplifier or receiver used to power your RS1000’s.
ILLUSTRATION #1
