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LOW OUT (SUBWOOFER)
Here’s a special surprise: If you bought the
M•2600 amplifier to power a subwoofer system,
you just saved yourself the cost of a crossover!
The M•2600 amp has an active crossover built
in. The amplifier can play the frequencies
below the crossover point set with the
CROSS-
OVER
switch .
20Hz 100Hz 1kHz 10kHz 20kHz
–15
dB
–10
dB
–5
dB
0
dB
5
dB
Here’s how to configure it:
1. Turn the M•2600’s
POWER
off.
2. Set the
OUTPUT APPLICATION
switch
to
LOW OUT (SUBWOOFER).
3. Select a crossover point, via the
CROSS-
OVER
switch : At
120Hz
, you’ll get the
low sub-harmonics on up to the audible
bass range. At
90Hz,
you’ll get the standard
subwoofer range. At
60Hz
you’ll get the
lowest frequencies, more to be felt than
heard. You’ll probably want to try this
switch each way.
4. Make sure the
LOW CUT FILTER
is set to
OFF
or nearly
OFF
. If it is turned up above
the crossover frequency, the output from the
amplifier will be greatly diminished.
5. Set the
AMP MODE
to either
STEREO,
MONO,
or
BRIDGED
, depending on your
application. These three modes operate as
usual with
LOW OUT (SUBWOOFER)
activated, except the speakers just get the
lower frequencies.
6. Connect your cords and speaker cables as
required (see the examples on pages 13-16).
7. Turn the M•2600’s
POWER
on. Woof!
If you want to use a second M•2600 or an
M•1400i to reproduce the rest of the audio
range, follow this procedure:
1. Connect the
THRU
jacks on the first
subwoofer amplifier to the
INPUT
jacks
on the second amplifier.
2. Set the
THRU
switch on the first
subwoofer amplifier to the
HIGH OUT
position.
3. With
POWER
off, set the
OUTPUT APPLICA-
TION
switch on the second amplifier to
FULL RANGE
(
LIMITER
either
ON
or
OFF
).
The first amplifier will play the frequency
range below the crossover point, and the second
amplifier will play the frequency range above it.
See the diagrams and further information on
pages 13–16. As a general rule, use your biggest
amplifier to power the subs.
Crossover settings.
STEREO
TYPICAL
1
CHANNEL
S
U
B
W
O
O
F
E
R
TYPICAL
35 Hz
CHANNEL
2
ON
TYPICAL
IN
IN
LOW CUT FILTER
INPUT
INPUT
CROSSOVER
SWITCHED OUTPUT
SWITCHED OUTPUT
BALANCED
OR
UNBALANCED
170 Hz
100 Hz
OFF
STAGE
MONITOR
90Hz
LOW
OUT
HIGH
OUT
THRU
LOW
OUT
HIGH
OUT
THRU
120Hz
60Hz
CROSSOVER
90Hz
120Hz
60Hz
AMP MODE
B
R
ID
G
E
D
M
O
N
O
OUTPUT APPLICATION
BALANCED
OR
UNBALANCED
LIMITER
(CH1 & CH2)
LOW OUT
(SUB WOOFER)
OFF
CH's
SUMMED
FULL
RANGE
LOW CUT FILTER
170 Hz
100 Hz
OFF
STAGE
MONITOR
S
U
B
W
O
O
F
E
R
TYPICAL
35 Hz
THRU
THRU