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Re: amp is cutting out
There may be a short or blown speaker. Try disconnecting the speakers and turn it up. If nothing happens, then one or more speaker is shorted internally. Connect one speaker at a time, turning up the volume to see if the error re-occurs. when it does, then that speaker is bad. However, if it still happens with all speakers disconnected, then there is aproblem with the amp itself and will need repair.
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You could be having an amp overload condition. Make sure your speaker impedance matches the amp specification. Esp if you have bridged the Amp the impedance should be at least 4 Ohms and not below. When you connect two 4 Ohms speaker in parallel the total impedance becomes 2 Ohms !!!.
If it's only your subwoofers cutting out and your speakers are still playing and all, try turning gain down on sub amp and see if that fixes it. I know if I crank my amp too high it kicks itself off to try to keep itself from blowing.
Alot of amps and speaker crossover have protection circuits built into them so when you turn up the music to much it's there so you don't blow your speakers. Try turning down the gain on the amp if that does'nt work check your speaker wiring for out of phase meaning
+ - wires are backwards. To test them use a 9v Battery touch the speaker wire to the + - terminals on the battery if the speaker pops out it's inphase and good if it pops in it is out of phase reverse wires and if all that checks out get a stonger amp.
You are probably running the ohms too low for the amp and its drawing too much current. Consult your amp manual for proper load level capacity and you can wire it accordingly. More then likely its only 4ohm stable bridged and your running it at 2 or less depending on if your subs have single or dual voice coils. Try connecting one pos speaker terminal to the other speaker neg then run the left ofer pos on one speaker and the the left over neg directly to the amp (series) I will raise the ohms (amp makes less power) but should not cut off unless the subs ohm are still to low, if this is the case you need a sub with a higher ohm rating or an amp wiht a lower rating...
check your ground wire and your remote wire, Wiggle them separately both at the amp and at the ground point. See if it cuts out then, and you;ll know which one. Also, does it have a light on it when it cuts out? if so, it could be going into protect mode, which wont allow it to turn on for a period of tine. Make sure the amp is not too small for the speakers you are pushing.
it might be that your wires from your amp to your subs are too thin. since they were relatively new the first three months, they were probably undamaged, but after pushing them too much, they probably have broken wires, and can't get enough power to the subs when turned up, i suggest getting thicker wires before investing in a capacitor, it could save you money.