simply stops. This causes a sine wave to “square off,” and the average power going into the speaker is roughly double that of a sine wave. Square waves sound awful, and could possibly damage your speakers and/or your reputation.
The LIMITER is especially handy when you’re working with loud output levels. Having the signal spikes (kick drum, for instance) attenuated a bit can actually increase the apparent loudness of the overall mix without diminishing the “power” behind the spikes.
Be Forewarned: With theLIMITER engaged, you can
still overdrive the amplifier into clipping and cause distortion. It just takes a
stronger signal to do it. So even with the LIMITER turned on, you should still pay attention to the OL LEDs .
SUBWOOFER
Here’s a special surprise: If you bought the M•1400/M•1400i amplifier to power a subwoofer system, you just saved yourself the cost of a crossover! The M•1400/M•1400i amp has an active SUBWOOFER filter built in. You can use it, along with the variable LOW CUT FILTER in a second M•1400/M•1400i, to reproduce the function of a crossover.
5dB
0dB
20Hz | 100Hz | 1kHz | 10kHz 20kHz |
Subwoofer Filter
Since most
Here’s how to configure it:
1.Turn the M•1400/M•1400i’s POWER off.
2.Set the OUTPUT APPLICATION switch to SUBWOOFER.
3.Select a rolloff point, via the FREQUENCY
switch: At “125Hz,” you’ll get the low
You’ll probably want to try this switch both ways.
4.Make sure the LOW CUT FILTER is set to OFF or nearly OFF. If it is turned up above the subwoofer cutoff frequency, the output from the amplifier will be greatly diminished.
5.Connect your cords and speaker cables as
usual (see “Quick Start” on page 4). Set the AMP MODE to either STEREO, MONO, or BRIDGE, depending on your application. (STEREO and MONO operate the same with SUBWOOFER activated).
6.Turn the M•1400/M•1400i’s POWER on. Woof!
1CHANNEL / BRIDGE / MONO
LOW CUT | INPUT | |
FILTER |
| |
TYPICAL | BALANCED | |
OR | ||
35 Hz | UNBALANCED | |
| STAGE |
|
| MONITOR |
|
| 100 Hz |
|
OFF | 170 Hz |
|
| CONSTANT DIRECTIVITY | |
| HORN EQ /AIR EQ | |
4.5 kHz | ON | |
|
| |
2k Hz | 6k Hz | OFF |
| AIR EQ | |
|
| TYPICAL |
AMP MODE
STEREO | MONO | BRIDGE |
TYPICAL | (CHS SUMMED) |
|
OUTPUT APPLICATION | |
FULL | SUB |
RANGE | WOOFER |
LIMITER (CH1 & CH2) | FREQUENCY |
| |
STEREO | 125Hz |
TYPICAL | |
ON OFF | 63Hz |
THRU | THRU |
INPUT | CHANNEL 2 | |
LOW CUT | ||
| FILTER | |
BALANCED | TYPICAL | |
OR | ||
UNBALANCED | 35 Hz | |
|
| STAGE |
|
| MONITOR |
|
| 100 Hz |
| OFF | 170 Hz |
CONSTANT DIRECTIVITY | ||
HORN EQ /AIR EQ |
| |
ON | 4.5k Hz | |
|
| |
| 2k Hz | 6k Hz |
OFF |
| AIR EQ |
TYPICAL |
|
|
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