Hey everyone having problems with sound system was looking for some advice. Whenever I drive and put a song on with good bass I cant really feel the bass and it doesn't seem kike there is a subwoofer in the car. But when the car is parked and I play the same track I can feel the bass much better and it sounds much better too any idea where the bass dissappears when I drive ? I have a jbl cs1214 and a jvc 4 channel amp and 2 6by9 jvc speakers . The sub is bridged on channels 3 and 4 and the speakers have a channel each.
Also if I sand the area where the ground wire is connected will this make any difference ?
All advice is welcome thanks !

 

road noise my friend. joy of car audio.

 

I also have a same problem , specially when i drive on the road which have ups and downs. Sometimes the sound stuck when i cross a speed breaker or some rough road.

 

Check for loose wiring, rca etc..

 

Static vs dynamic, totally different environment, hence, different response.