Crossover Switch; Amp Mode Switch - Mackie M-2600 Owner's Manual

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Frequency, Hz
L C Fil
Low Cut Filter Frequency Response
In order to match the output bandwidth
with your particular speaker system, the
M•2600 amplifier has a tunable LOW CUT
FILTER. The frequencies are marked along the
knob's travel :
• Fully counterclockwise, the frequency is
below 10Hz, effectively bypassing the filter.
• Center detent is 35Hz and labeled TYPICAL,
since precious few woofers actually go
below that.
• 3/4 of the way up is labeled STAGE MONI-
TOR, 100Hz, perfect for stage monitors
(they seldom reproduce below 100Hz;
besides, it prevents low-frequency "leakage"
into the house).
• Fully clockwise is labeled 170Hz.
So, grab your woofer's spec sheet and find
the low roll-off spec. Then set the M•2600's
LOW CUT FILTER
at the same frequency.
If you do this correctly (and make sure the
meters are happy), you'll never again see
your woofer moving sporadically without au-
dible signal. Your system will play louder and
cleaner, and you may never blow another
woofer again!

CROSSOVER SWITCH

This three-way switch allows you to set the
crossover point of the internal CROSSOVER
to either 60Hz, 90Hz or 120Hz. This affects
two things:
• The THRU output
1k 10k 20k
Hz Hz
switch
HIGH OUT.
• The SPEAKER OUTPUTS
OUTPUT APPLICATION switch
set to LOW OUT. The amplifier then
plays the frequency range below the
crossover point.
Note: The LOW CUT FILTER
both the THRU outputs
OUTPUTS

AMP MODE SWITCH

This three-way switch, along with the
OUTPUT APPLICATION switch
what kind of amplifier you want the M•2600 to
be (or not to be — what was the question?).
The AMP MODE switch determines the in-
put signal routing within the M•2600 amplifier.
Shipped from the factory, the switch is set to
STEREO. This is correct for about 90% of the
applications using an amp like this (hence the
TYPICAL indicator near it). But you may be in
the 10% bracket, requiring special input routing
within the amp.
AMP MODE should always be configured
before operation, with the amplifier turned off.
, if the THRU
is set to LOW OUT or
, if the
affects
and the SPEAKER
in the cases above.
, determines
is
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