Crossovers / Filters A7 - DLS ULTIMATE A-series Owner's Manual

FRONT SPEAKERS
LEVEL
+LEFT- +RIGHT-
3,5V
80 400
7V 0,2V
x20 change
by bottom switch
Crossovers / filters on A7
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.
Highpass filter on front 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
bottom plate changes the
filters 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,
typical setting is 400 Hz.
Input
Amplifier front
Front Rear
Front
x 1 Rear
input to
input to
rear & sub
sub
HP
x 1
x 20
Filters on sub
channel
The sub channel is made only for subwoofer use
and has a variable LP-filter. A normal setting for the
LP-filter is 60-80 Hz.
8
SIGNAL INPUTS
HP-filter
IN
FRONT REAR
240
LEFT RIGHT LEFT RIGHT
Hz
OUT
HP-filter
IN
240
80 400
OUT
Hz
x20 change
by bottom switch
a
Input
Sub
Sub input
separate
LP
Sub input
x 10
from rear
Lowpass
90
50 125
Hz
HP-filter LP-filter
LEVEL
IN
IN
240
2
3,5V
80 400 0,3 4
7V 0,2V
Hz kHz
OUT
OUT
x10 change
by bottom switch
Lowpass filter on rear channels
2
0,3 4
kHz
x10 change
by bottom switch
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.
Input
Front Rear
Front
x 1
input to
rear & sub
HP
x 20
LP x10 swith under the bottom plate
Highpass filter on rear channels
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.
ULTIMATE A7
REAR SPEAKERS
+LEFT- +RIGHT-
LP-filter
IN
OUT
Input
Amplifier front
Sub
Sub input
Rear
separate
input to
sub
LP
Sub input
x 1
x 10
from rear
HP-filter
240
80 400
Hz
IN
OUT