I just installed an amp and subwoofers for my brother in his car stereo. When the car is sitting idle the subwoofers have a minor whine to them. When he drives the car the whine seems to go up and down in pitch following the engine RPMs. Does anyone have any idea as to what causes this and how to fix it? Thanks in advance!

A: typically this is caused from having a power wire to close to the signal wire (RCA). In newer cars it is sometimes difficult to find a clear path for the RCA from the head unit to the amp without passing a "powered" wire.. there are a couple solutions, the best solution is to get a better RCA cable that will shield the signal and eliminate the interferance all together, the other option is to add a filter to remove the interference. place the filter near the amp and be sure it gets...

Its a 1998 Jeep Grand Cherokee w/ factory installed infinity system. From what I understand since its an infinity system I have to buy another amplifier. What is the best option for me to get subwoofers. 10 or 12 inch.

A: there is no right or wrong answer here, if there was there would only be one size. you can get 10's or 12's they can both hit really hard, and really deep. and both can sound excellent. it is more a question of compatability. what i mean is first determine what subs sound good to you, then the power you want, then match the size and power ratings of the sub to the power you choose. i like to think of it this way, first decide the sq, then decide the volume. the 12's will be louder...

I wanted to know what was the best brand of car subwoofers there is. I was going to get a pair of hifonics subwoofers but i don't really know how they sound. I know JL's are really good when it comes to hard clean bass.

A: I too love my Infinity subwoofer.