The only thing in common between the two channels isthe AC cord. There are two power transformers and twoseparate power supplies. I don't recall ever bridging one.Ours have been built into the same four channel biamped monitor ampracks since 1990.RalphChuxGarage18.07.02 9:15.īoth the MX-1500 and the MX-1500a are fine amps, and you would bridge them inthe same way.As someone has pointed out, there are less output devices in the 1500a. Not a single failure to date.As far as the bridge settings, Let me dig up the manual at the officetoday and I can answer you tonite. We have a dozenMX1500/MX1500a's that we've run to 2 ohms on a regular basis over thelast 12 years. My understanding is thatbecause the amp was capable of drawing more than 15 amps from the mainsat lower impedance loads, they were unable to acquire a UL listing witha standard 15A edison plug without the 4 (8) ohm disclaimer on the back.QSC wanted to sell an amp everyone could plug in. We have some MX4000's that also claim 4 ohm stereo (8 bridged) on theback panel, but 2 (4) ohms in the manual. The 'a' has only half thenumber of output transistors!!Regards, PhilRalph Staub18.07.02 5:11. However, there are warnings in both manuals that such operationmay cause problems with overheating and current limiting - this is under theheading of 2 ohm load operation, which is the same as 4 ohms in bridge mode.The 1500a is quite different to the 1500. 'Byron Walker' wrote in manuals I have show both amps as rated at 1500 watts into 4 ohms inbridge mode. The MX 1500a looks enough different that Idon't want to assume they are set up the same way.ThanksPhil Allison17.07.02 21:20. I have been unable tolocate a manual for these amps. Does anybody know what the volume knob settingson the 1500 should be when set to run bridge mono? In bridgemono mode the 1500s I have say on the back they will run at 4 ohms. These seem to be different than the MX1500a (most likely older).
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