luckeyumer

I want to connect extra speaker on my Audi A4 B8 2013 ,but i cannot find any Amp installed in my car and all the speakers are only in the doors.Now what is the best way to get speaker wirings in the trunk.

Blitzzer

My 2015 A4 B8 has a woofer in the trunk and iirc the amp is located behind a door on the left hand side. Having installed many, many after market subwoofer boxes and amps; your best bet would be to pigtail off the original pos/neg running to the rear speakers into either an amplifier that supports a 'high level' input or a powered electronic crossover (avoid passive crossovers) and then run your rca cables to the amp. Which ever way you go always run your subwoofers in a mono configuration.. which means L+ & R- from the amp to the box if using one woofer, or the same with a patch wire running from the L- to the R+ if running a dual box. That would be a 4ohm mono configuration. Despite what they say on the box, very few amplifiers are 2ohm stable.. and anything 1ohm stable or less will cost you $1k or more. Also, always use the RMS power rating and not the PEAK (14.4v) rating when deciding on which amp to buy.. and always spend more on the amp than the woofer(s) if on a budget.