Thru And Thru Switch; Low Cut Filter - Mackie M-2600 Owner's Manual

You can connect an unbalanced XLR cable
to the M•2600, although this would be unusual
— as unusual as an unbalanced XLR output.
However, if you have an unbalanced XLR
connection to make, refer to the "Connectors"
section (Appendix B) at the back of this
manual for more information.
SHIELD
COLD
SHIELD
COLD
Balanced XLR Connectors: Apollo/Soyuz Rendezvous
The M•2600 amp expects to see a nominal
signal level anywhere between the –10 dBV
"semipro" and +4 dBu "pro" standards, mean-
ing almost any line-level mixer or other device
can be plugged into the amp's INPUTs. Use
the GAIN
controls to adjust the gain of the
amplifier to match the signal level you're using.
THRU and THRU SWITCH
Someday you'll do a show at NudeStock and
realize that one M•2600 amplifier is just not
going to do the job — you'll need a six-foot-
high rack full of 'em to hide behind. That's
what the THRU jack is for. It has three modes
of operation, depending on the setting of the
THRU switch
:
• THRU, a straight copy of what's going into
the amplifier, nothing added or taken
away from your big finish on spoons.
• LOW OUT, the lower frequencies only,
below the frequency set by the
CROSSOVER switch
• HIGH OUT, the higher frequencies only,
above the frequency set by the
CROSSOVER switch
Note that the LOW OUT
and HIGH OUT are also af-
fected by the setting of the

LOW CUT FILTER

24
source equipment into the first amp's INPUTs
jacks to the next amp's INPUTs, and so on,
daisy-chaining as many amps as you want for
your application.
2
HOT
1
3
1
pedance of 100 ohms, then you can daisy-chain
up to twenty M•2600 amplifiers, which presents
3
2
HOT
a load of 1200 ohms to the console (input
SHIELD
1
impedance of 24 kohms divided by 20 amplifiers
3
COLD
= 1200 ohms).
2
HOT
the signal on to other devices such as a DAT or
cassette recorder, enabling you to record exactly
what the audience is hearing. In the THRU
position of switch
wired straight from the XLR and TRS INPUTs
— so the signal coming out of the THRU jacks
is exactly the same as the signal going into the
amplifier.
on the first amplifier to the TRS 1/4" INPUT
jacks on the second amplifier using 3-conductor
shielded cables with TRS plugs on both ends.
Warning: If you use a regular guitar cord with
2-conductor TS plugs, you'll unbalance the sig-
nal at the XLR input by grounding the low side
(–) of the signal (pin 3).
.
cations. It's usually expressed in Hertz (or cycles
per second), like "40Hz–300Hz." The "40Hz"
. refers to the low-frequency point (usually, but
not always) where the speaker's output drops
by 3 dB, and will "roll off" completely as the fre-
quency goes down. There is no point in sending
a woofer any frequencies it can't reproduce —
. you can't hear it, and worse yet, it's a waste
of amplifier power that can be better used
reproducing frequencies you can hear.
To use the THRU outputs, connect your
as usual, then patch from that amp's THRU
A general rule of thumb is to
maintain a load impedance
10 times or more than the
source impedance to prevent
excessive loading. If your
console has an output im-
The THRU jacks can also be used to relay
, the THRU jacks are
You can also use the 1/4"
TRS INPUT jacks as THRU
jacks, (not affected by
switch
CUT FILTER
the 1/4" TRS INPUT jacks
LOW CUT FILTER
Every woofer has frequency response specifi-
or by the LOW
). Connect