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first place i'd look is in and around the rear lights check to make sure all connections are good and clean
then start looking around the one on the battery
think the new ones last a lot longer but it with all filament lights the brighter they are the shorter amount of time they will last
they are brighter than the standard lamps that were in my polo so i'm more than happy with them
you get a fault to ground on that cable and all it will do is melt/catch fire/battery explode
fuses are installed only ever to protect cables and nothing else
turn the head unit up to the point where it starts to distort then turn it down a notch
the sub level control might not be on your head unit. (on my alpine i had it).
you are looking to match the sub volume to speaker volume with the 50Hz test tone. (say you have half volume on head unit your...
you should set the head unit to how you will listen to it day to day but at the max volume
imho i would not turn any bass up on the head unit (apart from a sub level control and that would be set to max)
i'd try and get hold of a 50Hz @ 0dB test tone play that on repeat
then you set the gain...
where was that music coming from:S did you have it pluged into another amp at the same time:S
you should only be getting getting bass from the sub
you would probably have to set the gain quite high with an mp3 player plugged in
imho 8 awg should be the minimum for any audio setup that contains a stand alone amp
i'd have a guess you may have fried the rca output of the head unit by not having decent earth on the amp.
i'd redo the earth with a complete piece of cable and reconnect removing all grease until the very end