QSC Audio Players & Recorders - Page 3 - Recent Questions, Troubleshooting & Support

Adding a comment to Marc, you will need a big power speakers to drive safely with such powerful amplifier, good luck with your project. Nov 08, 2013

Change the back switch named Stereo/Bridge to Stereo Position, then re-check again.

Check power and fuses

please check for any blown fuses, if there is replace with the same value, do not replace it with a higher value. also check resistors near the rectifier diodes, check full wave diodes & ic regulators, if you find an error replace with the same value or specs.

check the fuse

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.

Hi,

There's a switch on the rear, put this in bridge mode.
Connect you speaker (not under 4 Ohm) on the two red outputs.
Here's your manual.
http://media.qscaudio.com/pdfs/mxusr.pdf

Good luck,
Gerard