might as well add my autobarn story. I know nothing about audio installs, so i had them do it, very clean job and sounds great, was worried going there at first but i has happy when it was all finished. I drove from there to pick up my gf and when i got home i noticed the eng temp was about 7c hotter then usual, and there was a loud hiss coming from the engine bay, i took it back to them and the guy just stared at it for a while. He then said, 'think ive done something there'. He sent me to a aircon/elect specialist down the road. Long story shortish, they cracked an aircon pipe when tapping into the battery for the amp, and they are now paying for a new part, regas and labour totalling around $400 to fix their mistake.