96' A4 2.8

I guess after 13 years my speakers have had enough. Both rears are def. blown. I was told replacing them with a better aftermarket product would still sound like **** and that i needed and AMP in order for correct sound.

Tried searchin this topic, no real luck there. Most are on Bose systems and mine is Acdelco. Any suggestions what i should do bout this? Maybe just get stock ones back in? Any advice is appreciated...