DLS MRA22 - MANUAL 2 Manual page 6

MRA41
The MRA22 is a two channel stereo amplifier. It has
a variable high pass filter, (HPF) 15-500 Hz. It has
also a variable low pass filter, (LPF) 50-500 Hz for
subwoofer use.
HPF
50Hz 220Hz
15Hz 500Hz
Off On
The MRA31 is a three channel amplifier. It has a
variable high pass filter, 50-150 Hz, for channel A/
B. The C channel is for subwoofers and has a
subsonic filter, a variable low pass filter, 50-120 Hz,
and a phase control variable from 0 - 180 degrees.
The subsonic filter can be switched IN-OUT and has
a fixed frequency of 25 Hz.
6
LPF
80Hz 200Hz
50Hz 500Hz
Off On
The MRA41 is a four channel amplifier. It is mostly
used with a front system connected to channels C/
D and a subwoofer connected to channel A/B. You
will find speaker wiring and filter setting example on
page 9. Please observe the proper settings of the
channel A/B LPF multiplier switch and of the channel
C/D HPF multiplier switch.
The MRA41 can also be used to feed a 2–way front
system with active crossovers between midbasses
and tweeters. This is described in a speaker wiring
and filter setting example on page 10.
LPF
Multiply
80/800Hz 200/2(k)Hz
x1 x10
Off On
50/500Hz 500/5(k)Hz
Off On
Channel A/B is equipped very much like the MRA22,
however the LPF has a multiplier. Thus the frequency
range of the LPF can be varied from 50 Hz – 500 Hz
in the x1 position or 500 Hz – 5 kHz in the x10 posi-
tion. This way we can use this amplifier to feed a 2-
way system, where the midbasses are fed from 80
Hz – 4 kHz.
The tweeters connected to channel C/D , operate
from 4 kHz upwards using the HPF in multiplier po-
sition x 10 150 Hz – 5 kHz.
HPF Multiply
50/500Hz 220/2(k)Hz
x1 x10
15/150Hz 500/5(k)Hz