Hi I put a Kenwood hu in 1999 coupe with Bose system. It sounds better but not that much. I don't plan on putting an amp or subwoofer in the near future. Would there be any noticable improvement if I put some decent 6.5 in the rear and different 3 1/2s in the front keeping factory sub. If so, any suggestions would be appreciated. Looking at focal and jl. Thanks in advance

 

I put in all Polk speakers i bought used from a friend and love them. Crutchfield has some great deals going on them . https://www.crutchfield.com/shopsear..._speakers.html