User manual MACKIE M

[. . . ] M. 4000 HIGH EFFICIENCY POWER AMPLIFIER 1 OL -3 -6 -9 -20 O O OL -3 -6 -9 -20 SIG O O 2 INTERNAL STATUS PROTECT SHORT INTERNAL STATUS PROTECT SHORT OVER TEMP MAX SIG MAX OVER TEMP POWER M-SERIES HIGH EFFICIENCY POWER AMPLIFIERS M·2000 M·3000 M·4000 M-Series Important Safety Instructions 1. Install in accordance with the manufacturer's instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. [. . . ] You can use one channel to power a woofer or subwoofer, and the other channel to power the mid and high frequencies. For normal operation, leave the switch in the FULL position. This allows full-range operation for that channel (no crossover filter). With the switch in the LPF (low-pass filter) position, all the frequencies below 150 Hz are allowed through the channel, and all the frequencies above 150 Hz are rolled off with a 2nd-order Butterworth filter. With the switch in the HPF (high-pass filter) position, all the frequencies above 150 Hz are allowed through the channel, and all the frequencies below 150 Hz are rolled off with a 2nd-order Butterworth filter. To use the X-OVER switches in a two-way or bi-amplified system: 1. Connect the same input signal to Channel 1 and Channel 2 inputs. If you are using the screw termi- You could also use the X-OVER switch as a high-pass filter for both channels. For example, in a monitor system, many monitor speakers don't reproduce frequencies below 100 Hz or 150 Hz. By rolling off the lower frequencies, you can preserve the amplifier's power for the frequencies that count, and the system will sound louder and cleaner. 12. LIMIT The LIMITER is not designed to alter your sound -- it's just there to protect your speakers from clipping. Its effect is virtually transparent, meaning you probably won't CHANNEL 1 GND GND CHANNEL 2 AMP MODE STEREO MONO BRIDGE LPF FULL HPF HIGH EFFICIENCY POWER AMPLIFIER SERIAL / DATE CODE M. 4000 (PUSH TO RESET) AC LINE BREAKER INPUT 1 INPUT 2 LPF HPF FULL D 150Hz X-OVER 150Hz X-OVER CAUT I ON RISK OF ELECTRIC SHOCK · DO NOT OPEN ON/ TYPICAL ON/ TYPICAL OFF OFF LIMIT LIMIT DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA MANUFACTURED IN CHINA · FABRIQUE EN CHINE ©2005 LOUD TECHNOLOGIES INC. · "MACKIE" AND THE "RUNNING MAN" FIGURE ARE REGISTERED TRADEMARKS OF LOUD TECHNOLOGIES INC. ~120VAC 60Hz 1600W 14 M-Series even notice any audible difference. We recommend that you leave it engaged, hence the TYPICAL label above it. If you're working at quiet levels all the time, or you've already placed a compressor/limiter in the signal path, or if you just hate compression, you can leave the LIMITER out of the circuit (OFF). The LIMITER works independently on each channel. It senses when the amplifier channel is about to be overdriven and attenuates the overall level just enough to keep the signal from clipping. Clipping occurs when the output voltage no longer linearly follows the input voltage and 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. [. . . ] The address of your closest authorized service center will be given to you by Technical Support. IMPORTANT: Make sure that the Service Request Number is plainly written on the shipping carton. LOUD Technologies reserves the right to inspect any products that may be the subject of any warranty claims before repair or replacement is carried out. LOUD Technologies may, at our option, require proof of the original date of purchase in the form of a dated copy of the original dealer's invoice or sales receipt. [. . . ]