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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.
I've had QSC power amps with internal fuses in the AC power section, and I have seen the fuse holders separate from the board. These were the 2-piece (per fuse) clips that solder to the board and the fuse clips into them. I'm not sure if you are talking about a speaker, a power amp, or a powered speaker, but if it doesn't power up at all, it's probably in the AC Power Supply area.
Please specify a bit more, does the rattle is physical(Enclosure structure) or electronically hear thru speaker(Power Amp Common Issue)? I have the solution for the amp issue, let me know.
Hello!
SO I am going to give you more of a signal layout from the turntables (or whatever you use to DJ) to the speakers.
Turn tables-> Mixer-> Eq-> Amp-> Sub and other speakers.
The part that I am not understanding is why do you need the QSC amp if you have a powered sub? The powered part of that means that there is a built in amp, which eliminates the need for the QSC amp unless you are sending that sound to main (non sub) speakers.
Hope that helps!
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...
sounds like an internal problem. first disconnect all spks from amp, then switch on head unit and check if amp turns on (LED ON?) then feel the heatsink, if heatsink gets terribly hot then amp has internal fault. if amp doesnt get hot then try connecting a single working speaker to each channel separately, it may occur that one channel is faulty only. amps can shut down if the speaker/s is faulty as well, check all speakers and spk wires for shorts before taking amp in for repair. cheers
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