DLS Svenska AB A1 User Manual

The LP-filter on the  rear channels is used when
you run a 2-way or 3-way speaker system with active
crossover. It will allow low frequencies only and
blocks higher frequencies. The filter can be switched
in and out.
The normal frequency range is from 0,3 to 4 kHz.
With the LP x10 switch, under the bottom plate,
you can change the filter frequency range from the
normal to 3 - 40 kHz. A normal x-over setting is 3-4
kHz when used for active crossover in a 2-way sys-
tem.
If you run a 3-way system on the amplifier you can
use this filter for active crossover between midbass
and midrange speakers. A typical setting is 400 Hz.

The sub channel is made only for subwoofer use
and has a variable LP-filter that can be switched on-
off.    A normal setting for the LP-filter is 60-80 Hz.

Amplifier front

x 20

 x 1

HP

 x 1

 

x 10

LP

        Input
Front

  Rear

      Input
       Sub

Front
input to
rear & sub

Rear
input to
sub

Sub input
from rear

Sub input
separate

LP x10 swith under the bottom plate

DLS A7 amplifier include highpass filter (

HP),

lowpass filter (

LP). On the two front channels the HP-

filter can be switched between two different frequency
ranges, likewise for the LP-filter on the rear channels.

The slope of the HP-filter is
12 dB / octave.
The filter can be switched off
if you want to run the
amplifier in full range mode.
Or use as a HP-filter for
tweeters if you want to run
a 2-way speaker system
with active crossover. The
HP x20 switch under the bot-
tom plate changes the filt-
ers frequency range from the
normal 80-400 Hz to 1600 -
8000 Hz. A normal setting is
3-5 kHz.
If you run a 3-way system
on the amplifier you can use
this filter for active cross-
over between midbass and
midrange speakers,  a
typical setting is 400 Hz.

8

Amplifier front

x 20

 x 1

HP

 x 1

 

x 10

LP

        Input
Front

  Rear

      Input
       Sub

Front
input to
rear & sub

Rear
input to
sub

Sub input
from rear

Sub input
separate

This

 HP-filter   is normally

used as a high pass filter
blocking

 very low frequencies

from reaching the speakers. It
is mostly used at say 80 Hz
to protect small speakers
( like 6 inch and smaller ) from
deep bass.
The slope of the HP-filter is
12 dB / octave.
The filter can be switched off
if you want to run the amplifier
in full range mode.