sounds like a bad ground to me. re-do the ground and make sure you sand ALL of the paint off were you bolt it down.

 

Sounds like a faulty amp to me.. The oscilating speaker comes from overdriving the amp.. That or like some of the others said check your remote line coming from the radio to ground for a short.. Do you have a power antenna on the car? that may be throwing your amp off too...

 

Please explain the oscilating speaker thing.

 

Oscillating Speaker... Its like when you are working with a gyro and the voltage over drives it,, the gyro doesnt know which way to go so it just goes nuts... Umm.. I dont know how to explain it.. The best I could say is that the speaker is getting fed an eronious voltage level from the amp and in turn the speaker doesnt handle it right and just jumps up and down (rumbles) Usually the problem would be from running yoursignal lines along side of the power cable or even getting alot of electronic noise from your alternator, or he could even just have a crappy head unit that sends out a dirty turn on signal.. Its dirty voltage (power) that makes the speaker do it.. I just dont know if it would be internal or externalof the amp..

 

What exactly is "dirty voltage"?

 

Lets try this......

It has nothing to do with a gyro. What your trying to explain is a square wave clipped signal from an underpowered amplifier. Basically the amp cannot provide a smooth sine wave and decides to go haywire to try and deliver the neccessary current. It ususally results in abruput current spikes that can destroy a speaker. The speaker only will oscilate if it has a signal, and regardless of how bad it is the sub will only travel one way. (F = M X B) the force exerted on a cone is simply the cross product of themagnetic field and the current flow through thevoice coil.

There is quite a large difference between the operation and signal wire interference. The signal wire interference uses basically the same equation, but remember that you are creating an eddy current through the low voltage signal wire becuase its low voltage singal is easily manipulated by the magnetic field created by the high voltage wire.

So really, a lot of what you said is right in its basis, but oscillating speaker is not anywhere near the term used to express it. BTW what are you, an engineering student.

 

you two wanna compair pocket protectors? Just kidding...........

I would also have to say it is probably the amp....

 

its not the amp,ground,power or anything like that.... buy a new set of GOOD rca's... not fromwalmart andnot cheapfrom thelocal audio shop...usually you will spend from $25-50 on good rca's... ill bet anyone here thats what the problem is... i worked at unique audioin vicksburg mississippi,seen this problem countless times...

 

Simply replacing RCA's might solve the problem if the higher end RCA's have a higher amount of shielding. Read my post above.