i have a car amp hooked up in my house, this is the worst way to do it but i just needed to see if the amp still worked because my freind gave it to me. its hooked up using a 12v ac adapter(positive to +12vdc,negative to ground,spliced positive to remote with a home light switch(15A) to turn it on and off) everything wors but it makes a loud buzzing noise over the music when played..... what could be the problem? please help.