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Hi / Low level input switch

To ensure best possible performance from the

amplifiers a switch have been installed to select

between Hi and Low input.

The drawings show where the switch is situated on

the respective amplifier.

When using High Level input:

Set the switch to position "Hi / Level"

When using Low level input:

Set the switch to position "Low / Level"

If the switch is set to wrong position, the amplifier

still works, but the risk for disturbances or distortion

increases.

CA20/21

Input Level control

Level

0,7V

0,25V

The input level control, 5V – 0,25 V, matches the

output of your radio to the input of the amplifier.

After installation is complete, make sure the input

of the amplifier is turned down all the way ( counter-

clockwise at 5V ). 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 radio and amplifier levels are

matched.

Grand bass on CA20, CA21 & CA40

Grand Bass

40Hz 60Hz

25Hz

80Hz

Grand Bass is used to increase the bass volume

at an interval of bass frequencies. You can select

the center frequency between 25Hz and 80 Hz

and the amplification between 0 dB ( no

amplification ) and 18 dB ( full amplification ).

The slope of the filter is 10 – 12 dB at maximum

setting.

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.

CA40

CA50

6dB 12dB

0dB

18dB

Power Light / Protect light

The power light (green ) comes on when

the amplifier is turned on.

Power

(Green)

The protect light ( red ) comes on

Protect

when the amplifier shuts down from

(Red)

overheating, or a short circuit ( spea-

ker failure)

Crossovers

All DLS Classic amplifiers include high pass filter

( HPF ) and lowpass filters ( LPF). In CA21 the high

pass filter is used as a subsonic filter.

All filters are continously variable and all filters can

be switched on and off.

High Pass Filter / Subsonic filter

HPF

50Hz 220Hz

15Hz 500Hz

Off On

CA20

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. In CA21 the

high pass filter is designed as a subsonic filter

variable from 15 Hz to 150 Hz.

The slope of the High pass filter is 12 dB / octave.

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

amplifier in full range mode.

Low Pass Filter

LPF

80Hz 200Hz

50Hz 500Hz

Off On

CA20

The LPF ( low pass filter ) 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 and out. In the CA21

amplifier you can select between two different

slopes, 12 dB/ octave or 24 dB/ octave.

Choose the slope and the setting that sounds best

in your car.

CA20, 21, 40 & 50

Subsonic

40Hz 100Hz

15Hz 150Hz

Off On

CA21

LPF

80Hz 200Hz

50Hz 500Hz

Off 24 dB

12dB

CA21