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. 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. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. [. . . ] Simply connect the 1/4" TRS INPUT jacks 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 2conductor TS plugs, you'll unbalance the signal at the screw terminal input by grounding the low side (­) of the signal (pin 3). nal inputs, you could jumper the signal over from Channel 1 to Channel 2 as shown below. JUMPERS CHANNEL 1 CHANNEL 1 GND GND GND CHANNEL 2 GND CHANNEL 2 COLD (--) HOT (+) SHIELD SHIELD If you are using the combination input, you could use the Thru connector from Channel 1 to connect to the input of Channel 2. Note: You cannot use the AMP MODE switch set to MONO to accomplish this because the X-OVER switches are located before the AMP MODE switch in the signal path. Set the X-OVER switch on Channel 1 to LPF and the X-OVER switch on Channel 2 to HPF. Connect the Speaker Output for Channel 1 to the woofer or subwoofer speaker cabinet. Connect the Speaker Output for Channel 2 to the full-range or mid/high speaker cabinet. 11. 150 Hz X-OVER This switch allows you to turn your M-Series amplifier into a combination two-way crossover and power amplifier. You can use one channel to power a woofer or subwoofer, and the other channel to power the mid and high frequencies. 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. 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). 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. [. . . ] Ship the product in its original shipping carton, freight prepaid to the authorized service center. 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. [. . . ]