Hum from subwoofer.

[Silver 10+ year member]

I made a thread a few days ago, but I was misleading people on it thinking that the headunit was bad. The headunit is not bad because I hooked up a brand new alpine 9886 and cooked it.

Here is the new senario.

For headunits I have:

Pioneer 6900UB

NEW - Alpine 9886

Amps:

Component - Alpine MRP 240

Sub - Hifonics BXi 1606D

Subwoofer:

15" Kicker L7

Vehicle:

2006 Jeep Grand Cherokee (No OEM amp)

I turn on my car and I had huge static coming from my front stage speakers, not any from the rear. My sub makes huge thuds, not even noise really. I unplug the RCA's from the sub amp and the front stage noise goes away, but my sub makes a constant hum. I plug in my bass boost adjustment cable (think firewire) and the sub turns on and off constistenly.I have power on the amp. It turns on fine, just a messed up signal when I plug in the RCA's. I replaced the RCA's because I did find a open in them, but it did not fix the issue. Also, when the amp is turned on the RCA wires get hot to the touch on the amp side. I am really confused.

Are the RCA's grounded out inside the amplifer? Is there a fix for this other than buying a new amp? If I buy a amp I am going BIG this time. No cheap shit.

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[grimreper912003 5,000+ posts]

try a different sub amp and see if that helps the RCA issue. As for the front stage, Im not sure on that one.

 

[Silver 10+ year member]

Well, the 2 amps are tied into together (turn on wire) and im running a distro block. I'm thinking that could be a backfeed issue.

Is there any way to bench test the amp? I have the tools to do it im sure. I just need readings/specs lol.