Question about Yamaha DSP-A1000 5-Channel Amplifier

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Missing manual I want to get a manual for my QSC PLX 3402 amp. I can't find anyone who would have one. Any ideas?

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Go here:

right hand side of the screen....
plx users manual...
enjoy !

Remember to rate the answer !!!...



Posted on Jul 28, 2008

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Qsc usa 900 power amplifier coming on but no signal.what can be the problem.I check all outputs

Are you then saying you have no sound, yet the amp is on? If so, with the unit off, listen carefully to the top of the amp. When you first push the power button, you should hear one click, followed by another click, about 5-20 seconds later. I'm guessing you hear the first click, but not the second. Is that correct? If this is correct, and you are interested in having your QSC repaired, Please visit my website at You may contact me there. Thank you.

Jan 22, 2015 | QSC Audio Players & Recorders

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My qsc plx 3402 will not power up. I believe I shorted it out with my speaker cables

Most likely...shorted speaker wires, defective speakers or too many cabinets wired together can blow a amplifier channel in an instant. Manufacturers use to mount protection fuses on the exterior of equipment but people started replacing 3 amp with 25 amp automobile fuses and destroying internal circuits. You could pop the cover to look for a power supply protection fuse (same value replacement please) BUT be careful as there are sustained voltages after the unit is disconnected from the AC outlet that hold enough power to make this type work dangerous. I recommend sending it to a professional repair shop for a checkout and estimate.

Oct 19, 2012 | QSC Audio Players & Recorders

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What kind a outputs transistor use a QSC Gx3 power Amp

this power amp uses 2SA1962 and 2SC5242 output transistors. You can download the schematic diagram from this website.

May 10, 2012 | QSC GX3 Amplifier

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How do I bridge my QSC GX 3 amp to run one speaker cabinet?

For QSC amps the GX series are not bridgeable. You will have to run one speaker to each channel.

Mar 22, 2011 | QSC GX3 Amplifier

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One channel's red led is always on and no sound

Register and download the manual for free at

See page 7.

"CLIP: red, to the left of each Gain control.

Normal indication: illuminates whenever the amplifier is driven beyond full power. The LED's brightness indicates the amount of distortion. Distortion that causes only brief flashing may not be audible.

During muting, the indicator fully illuminates. This occurs during normal "On-Off

Mar 17, 2011 | QSC GX3 Amplifier

1 Answer

I have a mx1500a qsc power amp and i was wondering do i need to rewire a tip/ ring/sleeve cable to make the proper connection to the input of the amp? coming from a snake can i just plug an instrument...


The best way is to make a new cable and connect the tip and sleeve.
Thats the best way to run your QSC, then you're using the balanced input.
But thats only working when the rest of the system is also balanced (snake etc).
Offcourse you can use your instrumentcable, but that is unbalanced and you will loose some gain.


Mar 07, 2011 | QSC MX1500A 2-Channel Amplifier

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Quiet Amp

sounds like you need a preamp. i would need more info to be sure. good luck

Feb 11, 2010 | QSC CX302 2-Channel Amplifier

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The amplifiers protection circuit when active will lower the volume significantly and sound poor. Is the amp driving an impedance it's happy with, not being overdriven and has adequate ventilation? Do the fans appear to work ok?

Dec 17, 2009 | QSC Audio Players & Recorders

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QSC ISA 280 Stereo Power Amp stopped working

This is a very precise questions as QSC amp are pretty rare and high end electronics equipment. There is no way getting an answer other than getting the amp at a sound shop for repair, wich might go for a visit at QSC anyway. From a sound shop repairman...

Sep 07, 2009 | QSC ISA 300Ti Amplifier

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