I have a legacy amp for my subs in my car. it is a la770 500w x 2ch. it just started randomly and what it does is when i turn it on, the protect light comes on VERY dimly and it puts out a very loud rumble constantly till i turn it off? what is the problem and how do i fix it????
You probibly have a bad RCA cable that happend to my on my brand new MTX thunder amp, try that or else move your ground to a dif. spot in the car or add another ground, also make shur your RCA cables are on the opp side of the power because they magnetic power ran through the power cables can distort and some time dammape your subs.
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Make sure you have a good ground connection. The ground wire should be solidly connected to the vehicle chassis in a paint-free location. If the ground is connected badly, the protect light will come on.
That all depends on the wattage of the subs. also the independance of the subs. If your amp is 1400 watt, maximum you want is 2 600watt subs. if your subs are higher you will blow your amp eventually as your amp isnt powerful enough to pump out to that level.You should never have your amp fully turned up to max, 80% is perfect and will not make your amp blow. Hense why you want your subs less than the max output of your amp.
Im sorry to tell you, that if only one side is working, you most likly have an open driver transistor or input device. If the one side had a shorted output then the whole unit would go into shutdown. The fact that the unit still works is a good sign. The correct way to test an amp is with some equipment most folks do not have, and that means a trip to your local good audio repair facility. They will need to doi a bench check on the amp with load resistors and a tone generator. If the amp preforms good on the bench, then you should start looking for bad speakers and or pinched wiring,loose connections or bad speakers. Let us know what happens? Good Luck