OneConcept 4-Channel Car Hifi Amplifier (1000W, Adjustable High and Low Pass Filter, Ultra-Compact Dimensions) Black

it works extremely well, my car is now a full blown massacre of sound thanks to this small amp with x2 pioneer 17cm fronts and x2 5 inch Vibes at the rear, however there's nothing built into the amp to prevent altenator noise from the engine coming through the RCA cables into the speakers. with the stereo on with no music playing there is a whistling sound which tunes with my acceleration and apparently this can be fixed with a power inline filter but still - why was the amp not designed to deal with this built in? 1 star down for that as i now have to wait for the filter to arrive and even when installing there is no guarantee it will actually stop that noise. this is pretty much never a problem because as soon as you turn the music volume up even at lower levels you pretty much cannot here the whistling sound from the engine, the music masks over it very well and of course if you are listening to volumes within the 50-60 range on your stereo with the amp volume's at 50% then you will never ever hear that whistling sound - just annoying to know that it's there though. oh and this only happens with the stereo on of course, with it off there's no whistling, and with music on you can't hear it anyway. but as i said... could have been designed to draw power from the battery instead of engine.

Sound quality sucks but it definitely works.

better than i expected. apart from the small noise i get from the engine

Didn't even last 5 minutes.

Very Very bad

worked for a few van speakers