DLS RA50 How To Install And Operate page 8

Filters on CH 3 and CH4
CH3 and CH4 include high pass filter (HP).
The slope of the filter is 12 dB / octave. The filter
can be switched off if you want to run the amplifier
in full range mode.
The HP-filter can be used in three different
frequency ranges by changing a switch in the bot-
tom plate of the amplifer. The switch has three
positions giving the following frequency ranges:
x1 = 50 - 140 Hz
x5 = 250 Hz - 700 Hz
x50 = 2,5 kHz - 7 kHz
The HP-filter is used when running a 2- or 3-way
system in active mode. See the examples later in
the manual.
x1
50 -140 Hz
x5
Switches
250 - 700 Hz
in bottom
x50
plate
2,5 - 7,0 kHz
CH3 CH4 HP filter
Frequency selector
Remote Bass level and phase control box
The amplifier includes a
remote control unit. With
this unit it is possible to
adjust the bass level and
phase on the subwoofer
channel (CH5), from the
front seat. Connect the
cable between
amplifier socket and the
socket on the remote box.
8
the
Filters on CH 5, sub channel
CH5 include low pass filter (LP) and subsonic filter.
The slope of the LP-filter is 12 dB / octave and 18
dB for the subsonic filter. The subsonic filter can be
switched off if you dont want any limitation in the
lower frequency range.
The LP-filter allows low frequencies only and
blocks higher frequencies. The filter can be varied
from 40 - 125 Hz, a typical setting is 50 – 80 Hz.
The subsonic filter is used to take away the very
deepest frequencies from a bass box. The x-over
frequency is 25 Hz.
Grand Bass is used to increase the bass volume
with a center frequency of 40 Hz. You can select
the amplification between 0 dB ( no amplification )
and +18 dB (full amplification). This function is used
to compensate for the bass box function and to
adjust for your own taste of bass. Set level control
at 0 dB if you want it to be inoperative.
The phase control on the sub channel (CH5) can
be set continuously from 0 - 180 degrees. This is
very useful when you want to adjust the bass sound
for best front stage image. Start on 0 and turn the
control slowly clockwise until you experience that
the bass sound is coming from the front. If you dont
get the result you want, also try to phase reverse
the subwoofer connections and make a new
adjustment. Using the remote level control box you
can adjust the phase from the front seat.
RA50