In a message dated 7/13/2005 8:34:14 A.M. Central Standard Time, marty@xxxxxxxxxxxxxxxxx writes: What brand of amplifier are you using so successfully? Marty Galbreath 3765 Marty - I am using a Monitor-1 4 channel amplifier for my 6 full range speakers with a 4 band parametric EQ by monitor-1. my subwoofer is driven by a JL audio 250/1 mono amp. Head unit is Alpine. The Monitor-1 stuff is built by Zapco. You should try removing your headunit's power and ground wires and wiring it directly to your battery and wire your amp directly to your battery as well. I had some slight alternator whine until I grounded EVERYTHING into distribution blocks were then grounded TOGETHER directly to the battery. There's no other way to eliminate ground-loop noise otherwise. Since I did that, my system is totally silent. Try that and see how it works. Andy [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/