QSC Audio Players & Recorders - Recent Questions, Troubleshooting & Support

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possible wrong speaker impedance

The red clip lights on the QSC RMX2450 indicate that the amplifier is receiving a signal that is too strong and could cause distortion or damage to the speakers. The green lights indicate that the signal is within a safe range. When there is no input signal, the amplifier defaults to the red clip lights as a precautionary measure. Once a signal is received and it is within the safe range, the lights turn green. This is a normal behavior for this amplifier.

If the fans are working correct then you should lower the bias idle current, let me know more.

If you remove the grille and un bolt the speaker, remove the connectors on the speaker input and use a pp3 battery to test for movement of the speaker cone.

https://www.qsc.com/resource-files/productresources/spk/k.2/q_spk_k.2_usermanual.pdf https://www.youtube.com/watch?v=CJ2YBbSLWw0 https://www.manualagent.com/qsc/k10/owners-manual/page-102

You have a high power amplifier and the work you propose leaves no room for either error or compromise. If, as you suppose, the output is by complementary pair, the transistors must be matched pairs providing equal gain characteristics. Unless you have seen inside a complete amplifier of the type you are only guessing at the output stage(s) that could be by module or a multiple transistor output. There also might be other driver stage(s) sharing the same heat sink. The least you will need is a service manual and an internet search produced a number of results on the below link. https://www.google.co.uk/search?rlz=1C1CAFB_enGB673GB676&ei=PtG_W56NM6mIgAaYwaqIDg&q=qsc+mx1500a+service+manual&oq=qsc+MX+1500a+amplifier&gs_l=psy-ab.1.3.0i71k1l8.0.0.0.32505.0.0.0.0.0.0.0.0..0.0....0...1..64.psy-ab..0.0.0....0.D6yNqkAW5nw

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 audioserviceclinic.com. You may contact me there. Thank you.

As always with stereo amps the two channels are identical, so if one goes wrong you have the other as a control for testing purposes. So if you start by looking and comparing the two channels. that's a start! If a part looks odd on the faulty channel, but is fine on the good channel you have found the problem. You can also do tests, such as touching the two channels with an insulated screwdriver, while powered up. If it buzzers on the good channel, it should buzz on the other channel at that point. Keep away from the power supply and ignore anything that is on it's own, that has no duplicate, or is common to both channels.