I installed some 6x9`s Roadmaster fro wal-mart for $20, I got the idea from the 240sx at the junkyard I got my fender off of, it was in the front. So I went to wal-mart found some 3 way roadmaster cheapo`s that looked good. By installing these I got way more bass than my Polk Audio GXR 4x6`s, When im not driving my stereo dims kinda when I turn it up though??
Ryan

 

to be sure i'd need more details but...new alternator or battery (i think alternator). Take a multimeter and mesure the volts you're alternator is running at when the car is on (it should be at 14), if it's less than that you need a new alternator. that's the short and simple of it.

 

I said it does it when im NOT driving it, hwta would that have to do with ym alternator, I think both my alternator and battery are fine.
Ryan

 

$20 for 6X9's? Lol, souds like quality to me. . .

And subs do that from the bass as well when the bass hits, but generally such cheap speakers won't. And by the way, 6.5" will generally hit better than 6X9's

Dr.

 

These speakers have a mid range and tweeter, so thier not that bad, they also big a big magent that is almost as widew as the speaker, theyre are the best for your money.
Ryan