hi
I am using a tda 7377 amplifier which i got off of ebay http://www.ebay.com.au/itm/DIY-Kits-subwoofer-2-1-TDA7377-power-amplifier-3-Channel-power-ampNE5532-pre-amp-/321062261135?pt=AU_Electronics_Audio_Amplifiers&hash=item4ac0cd518fit
it works fine when i have an ipod or something plugged into it but with the the car stereo connectede I get a low muffled output.Even in past i have had a 12v to 5v regulator circuit running off the same psu as the amp and when i have my phone charging and try to listen to music I get the same low muffled output
thanks in advance,
denim