
Ordinarily, applying a positive
voltage to a speaker’s positive
input and negative voltage to
the negative input results in
an outward excursion of the woofer. But some woofers are
built with reverse polarity, meaning that the above conditions result in an inward excursion.
If you’re not sure which type of speakers you have, take a look at their literature. If you’re still not sure, here is a simple test: remove the speaker wires from the back of the speakers, then take a 1.5V flashlight battery and connect the positive terminal of the battery to the positive (+) input of the speaker, and connect the negative terminal of the battery to the negative
(–)input of the speaker. Observe the motion of the speaker cone. It should move out when volt- age is applied, and return to rest when voltage is removed. Make sure all the speakers in the system move in the same direction (there are a few exceptions — some speakers are deliber- ately designed with

The M•2600 amplifier gives you a choice — it has the traditional XLR inputs, as well as 1/4" TRS
Each can be used with either balanced or unbalanced signals.
When connecting a balanced signal using the XLR or 1/4" jacks, they’re wired as shown, per AES (Audio Engineering Society) standards:
| XLR | TRS |
Hot (+) | Pin 2 | Tip |
Cold | Pin 3 | Ring |
Shield (Ground) | Pin 1 | Shield |
RING SLEEVE | SLEEVE RING TIP |
TIP |
|
| RING (COLD) |
| TIP (HOT) |
| SLEEVE (SHIELD) |
Balanced 1/4" TRS Plug |
|
Unbalanced TS
SLEEVE | SLEEVE | TIP |
TIP
RING (COLD)
TIP (HOT)
SLEEVE (SHIELD)
Unbalanced 1/4" TS Plug
1CHANNEL
INPUT |
|
|
|
|
| CROSSOVER |
|
BALANCED | LOW CUT FILTER |
|
|
| |||
OR |
|
|
| TYPICAL | 60Hz | 90Hz | 120Hz |
UNBALANCED |
|
|
| ||||
|
|
|
| 35 Hz |
|
|
|
|
|
| R | STAGE |
|
|
|
| O | F | E | MONITOR |
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
| |
| O |
|
|
|
|
|
|
| W |
|
|
|
|
|
|
B100 Hz
U
S
OFF | 170 Hz |
| AMP MODE | |
STEREO | MONO BRIDGED | |
TYPICAL | ||
|
| CH's |
| SUMMED | |
OUTPUT APPLICATION | ||
| FULL | LOW OUT |
| RANGE | (SUB WOOFER) |
CROSSOVER
60Hz | 90Hz | 120Hz |
|
|
|
| CHANNEL 2 |
|
|
|
| INPUT |
LOW CUT FILTER | BALANCED | |||
|
| TYPICAL | OR | |
|
| UNBALANCED | ||
|
|
| 35 Hz |
|
|
| R | STAGE |
|
O | F | E | MONITOR |
|
|
| |||
|
|
|
| |
O |
|
|
|
|
W |
|
| 100 Hz |
|
U |
|
| ||
B |
|
|
|
|
S |
|
| ||
|
| OFF | 170 Hz |
|
THRU
THRU LOW HIGH OUT OUT
IN
SWITCHED OUTPUT
OFF
ON
TYPICAL
LIMITER
(CH1 & CH2)
THRU
HIGH LOW THRU
OUT OUT
IN
SWITCHED OUTPUT
23