low00ranger 10+ year member
Senior VIP Member
We did this install in a 2003 S-10 with a basic Sony head unit. For about a month it was completely stock except the Sony head unit and didn't have any whine. I installed a set of old old old MTX Terminator 12s on a Hifonics 1606d at 2 ohms and now the system is giving a faint whine from the stock door speakers only. The whine does not increase pitch with RPMs. No bad noises from the subs. I didn't change anything on the headunit except for connecting RCAs and amp remote wire. The amp has a decent ground with paint scratched off, RCAs are somewhat cheap Scoshe, and head unit uses stock ground. I'm trying to figure out how adding a sub amp introduced noise to the stock speakers???