I need your help!!! Please???

[ride92]

Hello, I'm new to the forum and need some help trouble shooting some issues with my recent amp/sub install in my 2003 mazda protege5. When the car is running I get some wierd this happening to the sub. It pulses very slowly in time with the engine running. Anytime the engine fan kicks in the subs cone move quite a bit. I don't know why this happening. So please help me. The setup I have is a 8" kicker comp sub and a crunch audio p500.2 amp that I installed to my stock HU. The amp is under the drivers seat with power cable running up the drivers side to the battery with a inline fuse, the remote power cable is spliced into a wire on the factory harness that gets 12v only when the key is turned to Acc or on. The ground wire is bolted down to a spot that I sanded till shiny to the cars floor near the seat bolt. I am using the High level inputs for audio signal as the head unit doesn't have RCA's, they are spliced into the rear door speaker wires also under the driver side door sill. The power cable and highlevel inputs are close to each other for only about a foot and then go there seperate ways. Speaker wire is run to the trunk for the sub. I don't hear anything from the sub when it moves and the volume is all the way down. I've move the grounding location twice now to no avail. It only does it when the HU is on and the car is running, when I turn the HU off the sub does nothing even though the amp is still on. Disconnectiong the Input leads with the car running and the head unit stops the sub from moving. With the car not running but HU on and playing there is no problem. It seams like I am getting altinator noise thru to the sub (even though it makes no sound) when the car is running ( it moves even with volume all the way down). If anyone has an idea of what I can do to fix this problem, please I'm all ears. I don't want to damage anything because of this problem.

Click to read more...

 

[ride92]

Come on... Anyone??? Please this problem is causing my head to feel like it's in a vice, I just don't get it.

 

[Rich B 5,000+ posts]

My bet would be you have a bad ground on either your amp or at the head unit, but consider this a bump to get one of our resident car audio gurus to chime in.

 

[ride92]

My bet would be you have a bad ground on either your amp or at the head unit, but consider this a bump to get one of our resident car audio gurus to chime in.

The amp is grounded to the floor of the car and Checked resistance there this morning by taking a wire from the negative battery cable and using a meter measured virtually no rise in resistance - basically it a good ground. Unless the grounding problem is internal?

It's the factory Head unit... why would the the ground be bad there?

And yes any car audio Gurus please chime in. Thanks

 

[dman4486 5,000+ posts]

could just be an issue with the high in's on the amp...

 

[ride92]

So you think it could be something in the amp itself? should I try to get a replacement amp?

 

[ride92]

So you think it could be something in the amp itself? should I try to get a replacement amp?

 

[BigCatSmile 10+ year member]

It sounds like it the HU, if you just have to use the stock HU then you could put a high pass filters to let the bass pass but roll off the low frequency flutter,

i use a line to RCA converter on mine... your amp may not like the high line input. //content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif