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Two fullrange speakersconnected in stereo
mode
One subwoofer connected in mono bridge
mode
The HP-filter is here used as
subsonic filter to take away
the very deepest frequencies
from the subwoofer. The
typical setting is around 25 –
40 Hz.
The LP-filter will allow low frequencies only and
blocks higher frequencies. A typical setting is 70 –
90 Hz. When used with a subwoofer the switch
should be in IN-position. Set the LP-filter to 70-90
Hz.
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).
The phase control 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.
Filter settings
NOTE!
4 ohm minimum load when using bridge mode
connection. Lower impedances may damage the
amplifier. In bridge mode the amplifier sees a 4
ohm load as 2 ohm.
7
Speaker wiring RA20
RA20 is a 2-channel stereo amplifier. It can be
connected either as a stereo amplifier for fullrange
speakers, or as a mono amplifier for subwoofers
connected in bridge mode.
RA20
With the HP-filter in OUT position the amplifier
allows the speakers to play fullrange. If you for
some reason want to limit the low bass
reproduction switch IN the HP-filter. The typical
setting is then around 60 – 80 Hz.
The LP-filter should be OFF
(switch in OUT-position).
Filter settings
+
-
-
-
+
+
7


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