dls ra40 사용자 설명서

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.

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.

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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.

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).

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