Pioneer amp GM-4000F or GM-6000F ?
 

I juste wanna get an amp for 4 speakers (pioneer ts-d680r + ts-d690r). I don't know if I really need to get a very good amp beacause I'm not planning on adding a sub in my car. I don't think I should need something incredible...I just want to increase the sound's quality. I'm debating between the Pioneer GM-4000F or the GM-6000F. What's your advise? Remember that I don't want a sub...
Thank You