QSC Audio MX3000a manuale d’uso

1 Owner’ s Manual ® A U D I O *TD-000026-00* Rev. B MX 1000a MX 1500a MX 2000a MX 3000a ▲ ▲ ▲ ▲ MXa Series[...]

2 MXa Series Power Amplifier Operation Manual T ABLE OF CONTENTS I. WARNING NOTICES ................................................. 3 Speaker Damage ....................................................... 3 Speaker Output Shock Hazard .................................. 3 Rack Mounting Precaution ......................................... 3 II. OVE[...]

3 I. WARNING NOTICES SPEAKER DAMAGE The MXa Series amplifiers are among the most powerful professional amplifiers available and is capable of pro- ducing much more power than many loudspeakers can handle. It is the user ’ s responsibility to use suitable speakers with the amplifier and to use them in a sensible way that will not cause damage. QSC[...]

4 II. OVERALL DESCRIPTION The MXa Series from QSC comprises four high-effi- ciency professional power amplifier models, each with two independent channels. The MX 1000a, MX 1500a, and MX 2000a, can deliver, respectively, 275, 400, and 475 watts into 8-ohm loads, and 400, 600, and 725 watts into 4-ohm loads Either channel of the MX 3000a is capable [...]

5 III. INPUTS An MXa amplifier features balanced inputs, connected via barrier strip terminals or 1/4 ” (6.3 mm) tip/ring/sleeve phone jacks. The tip of the input jack is wired for “ nega- tive ’ or inverted polarity, while the ring is the non-inverting input. Thus, if the voltage at the tip is positive with respect to that at the ring, the a[...]

6 IV . OUTPUTS Four “ touch-proof ” binding posts — one pair per chan- nel — on the rear panel allow speaker cable connections to the amplifier outputs. The special design allows con- nection of large diameter speaker cable while reducing shock hazard due to the high output power of MXa amplifiers. The “ hot ” terminal of each output pa[...]

7 TROUBLESHOOTING PROBLEM: Channel will not come out of muting • If reducing the gain control to ∞ attenuation does not release muting, the channel is defective or overheated (see “ Overheating, ” below). • If reducing the gain releases the muting, raise the gain back up slowly while you watch the “ SIG ” and “ CLIP ” indicators; [...]

8 SPECIFICATIONS MX 1000a MX 1500a MX 2000a MX 3000a 250 350 450 800 FTC Watts Per Channel 20Hz-20kHz, 0.1% THD EIA Watts Per Channel 1kHz, 1% THD 8 Ω Load 275 400 475 850 8 Ω Load 400 600 725 1300 4 Ω Load 500 750 1000 1600 2 Ω Load* 350 500 650 1200 4 Ω Load MODEL *typical MX 1000a MX 1500a MX 2000a MX 3000a 500 700 900 1600 Bridged Mon[...]

9 MX 1000a MX 1500a MX 2000a MX 3000a CONNECTORS (each channel) Input: Barrier strip and 1/4 ” RTS phone jack Output: “ Touch-Proof ” binding posts COOLING MX 1000a, MX 1500a, MX 2000a: 2-speed fan with back-to-front air flow MX 3000a: Continuously variable speed fan, with back-to-front air flow AMPLIFIER PROTECTION Output Averaging ™ short[...]

10 PARALLEL, STEREO, OR BRIDGED OPERATION The Parallel-Stereo-Bridge switch is located on the input panel, next to the input jack for channel 1). The most commonly used operating mode for a power amplifier is “ Stereo, ” in which the two channels are independent and separate all the way from input to output. Set the switch in the center positio[...]

11 VI. LONG-TERM OUTPUT POWER In a properly designed sound system, you can usually obtain the desired sound level without using the full output power of the amplifier; if the “ CLIP ” indicators flash once in a while, that is perfectly normal. If the amplifier is operated at extremely high power levels, it may overheat or may even damage the sp[...]

12 HEAT EMISSIONS Essentially, a power amplifier draws electrical energy from the AC mains, converts it to DC, and then converts it again into an analog of the input signal to send out to the loudspeakers. Any AC power that enters the amplifier through the power cord and does not exit through the speaker outputs turns into heat, which the amplifier[...]

13 output until it can be repaired, at which time the fuse should be replaced also. Temperature sensors on the channel heatsinks and the power transformers are part of the thermal management circuitry. On the MX 1000a, MX 1500a, and MX 2000a, the temperature sensors govern whether the dual-speed fan should run at low or high speed. Below 55 ˚ C, t[...]

14 File Library QSControl Hardware Support QSControl Software Support EX, MXa, VS, USA, and Series One Slot Accessories General Notes File T ypes Graphics Mechanical drawings Specifications Application notes Field service notes Service bulletins Schematics Pin-outs Owners manual text segments Environment files Computer utilities and drivers Service[...]

15 X. IMPOR T ANT ADDRESS AND TELEPHONE INFORMA TION Factory address: QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Factory telephone numbers: Main Number (714) 754-6175 Sales Direct Line (714) 957-7100 Sales (800) 854-4079 (toll-free in U.S.A. only) Sales & Marketing FAX (714) 754-6174 Customer Service[...]

16 ® A U D I O “ QSC ” is a registered trademark of QSC Audio Products, Inc. 1675 MacArthur Blvd. Costa Mesa, CA 92626 (714) 754-6175 FAX (714) 754-6174[...]