Bass cuts in and out

[WildFire532FB]

So when i am playing a rap CD my bass cuts out on the first hit of the bass. Its a stock stereo system for a 96 Ford Explorer Eddie Bauer. I did put a stronger 6 inch sub in the vehicle. It only does it for CDs so i am thinking it could be the CD player? it also makes some funny noise at certain frequency on CDs.
What is the other thing next to the amp in the back?

 

[fixxxer]

Does the replacement sub have the same impedence as the one that was replaced? I think the stock sub is an 8ohm, if you put in a 4ohm or a 2ohm, the amp is probably going into protect mode. The new speaker could be causing the amp to draw more power from the electrical system, the amp would "think" it has a shorted speaker and would shut down to protect the amp's circuitry as well as protecting the vehicle from electrical fire and what it would see as a short-circuit.

 

[WildFire532FB]

the funny noise that i hear comes through the other speakers and not the sub.
i am not sure what the ohms is of my new sub. let me see if i can check

 

[fixxxer]

It is possible that the CD player is going bad, you can try getting one from e-bay or from a junk-yard but if you are going to replace it, you might as well go for a new head unit. That way you have a warranty on a brand-new piece of electronics gear.

 

[WildFire532FB]

my sub is a 4ohm

 

[WildFire532FB]

is there any way i can trick the amp into thinking the sub is a 8ohm instead of a 4ohm?