Bedienungsanleitung DLS ra20 (Seite 6 von 12) (Englisch)

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Input Level control

The input level control, 7V – 0,2 V,

matches the output of your radio to

the input of the amplifier. After instal-

lation is complete, make sure the in-

put of the amplifier is turned down all

the way ( counter-clockwise at 7V ).

TheDLS Reference amplifiers include high pass filter

( HP) and low pass filters (LP). The highpass filter

can also be used as a subsonic filter.

All filters are continously variable and all filters can

be switched on and off.

The slope of all filters are 12 dB / octave.

The filter can be switched off if you want to run the

amplifier in full range mode.

This is the crossover configuration on RA20 & RA40:

RA20:

LP-filter 40 - 125 Hz

HP-filter 20 - 150 Hz

RA40 CH1 & 2: RA40 CH3 & 4:

HP-filter 20 -150 Hz HP-filter 20 - 150 Hz

LP-filter 40 - 125 Hz

The HPF ( high pass filter )

blocks very low frequencies from

reaching the speakers. It is

mostly used at say 60 Hz to

protect small speakers ( like 6

inch and smaller ) from deep

bass. It can also be used as

subsonic filter to take away the

very deepest frequencies from a

bass box. The typical setting is

then around 25 – 40 Hz.

High Pass Filter / Subsonic filter

Low Pass Filter

The LP-filter ( low pass filter) is

mostly used for subwoofers. It will

allow low frequencies only and

blocks higher frequencies.

A typical setting is 50 – 80 Hz.

The filter can be switched IN-OUT

and is available on both RA20 and

RA40.

Play a tape or CD, make sure all bass or treble

settings or equalizer are flat, and turn the volume

of the radio up until you just start to hear distortion.

Turn the volume control down just a bit. On the

amplifier increase the input level control ( clockwise

or to the right ) until you just start to hear distortion,

then back the level control just a bit. Now your ra-

dio and amplifier levels are matched.

Grand bass 40 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).

The phase control on RA20 &

RA40 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.

Phase control

RA20 & RA40

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. On RA40

this function is operative only

on channels 3 & 4.

PHASE

180

DEGREE

BASS

+18

GAIN

0,2V

HP-filter

FREQUENCY

150

LP-filter

FREQUENCY

125

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DLS ra20 Seite 6

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