I have a crossfire vr2000d it plays at really low volume and sounds distorted. when i try to turn it up it goes into protection mode. i check the subwoofer and wires and they are all good. i put another amp in place of the vr2000d and it works fine. its this amp still repairable?
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sounds like distortion is being caused by trying to amplify a low volume level from the input device. try putting the ipod volume at a medium level and try again to see if the distortion goes away/reduced
Well it sounds like you need a mono block amplifier for the subwoofers. Subwoofers are ment for low frequency. If you try to run regular audio through the subwoofer the sound will become distorted at a high volume. If you have a crossover on the amplifier try putting it on LP. Also do not exceed the RMX rateing on the subwoofer because if you do they will also distort. If you try adding the mono block on to it and it is still doing it you may also be running to much power to the subwoofers.
If the amp still goes into protect mode, the easiest thing to do is disconnect the RCA cables from the amp and see if still goes into protect mode (after turning off/on). If it does, the issue lies in the amp or the wiring to/from the amp (most likely case). Check to make sure no speaker wires came loose and touched +12V or ground (car body). From the sound of it, my guess is something internal to the amp died and will need repair.
Give that new sub a chance to "break in". New speakers require a few hours of use before the voice coil(s) and spider break in and began operating at their best performance. Is the box within the operating specs of the sub? Is this a ported box; if so you will here some turbulance type noise from the port. What type of distortion are you hearing? Alternator noise(dentist drill like sound) would only be noticable through a sub at lower volumes due to the frequency response of a sub. Is the amps lowpass crossover turned on?