getting hu bench tested

I will be taking my HU to get bench tested. They are going to charge me $5 to get it done. What can I expect for them to test? Reason I am getting it tested is because of my engine noise problem, and I have tried absolutely everything to get rid of it or to test where the problem lies. I can't resolve the engine noise issue short of swapping out the HU for another Eclipse Head Unit, which I do not have.Mark "Hamzter" Cinense

1991 Infiniti G20 w/JDM SR20DE

Eclipse CD8445

MTX Thunder 684

Polk DB6750

Polk DB6500

Optima Red Top in the Trunk

Well a bench test isn't going to find if theres an alternator whine because there is no alternator. I would just give them your car and pay whatever they charge because that is the hardest problem to solve.

Good point. I will take the vehicle in. Before I do, I am going to re-route the 2 x 0 gauge wire a slightly different route. Actually I will probably turn on the car a couple of times with the new route of the power wires and see what happens.Mark "Hamzter" Cinense

1991 Infiniti G20 w/JDM SR20DE

Eclipse CD8445

MTX Thunder 684

Polk DB6750

Polk DB6500

Optima Red Top in the Trunk

ok... I didn't get the Eclipse CD8445 bench tested. I am closer to thinking that is not it... But check this out... I was driving home without the radio even installed and I can hear a faint whine... could that be the culprit. Now the problem is finding out where it is coming from. can my speaker wires be taking in the noise even without the system turned on?Mark "Hamzter" Cinense

1991 Infiniti G20 w/JDM SR20DE

Eclipse CD8445

MTX Thunder 684

Polk DB6750

Polk DB6500

Optima Red Top in the Trunk

Found my problem. I pulled the head from where it is mounted and the noise is about gone. So I take a wire and ground it to the chassis of the car where the radio mounts to and viola...   noise is audible again. Keep in mind that the CD8445 is also grounded via the black ground wire to the trunk where the amplifiers are grounded to the chassis. If I remove the wire the noise is almost gone again. Do you all think that my Eclipse CD8445 is bad? for now, I am going to try and isolate my HU from the chassis using some plastic washers or something so that the screw is not touching the HU. So, I am at a loss unless you all agree with me that the HU is malfunctioning.Mark "Hamzter" Cinense

1991 Infiniti G20 w/JDM SR20DE

Eclipse CD8445

MTX Thunder 684

Polk DB6750

Polk DB6500

Optima Red Top in the Trunk