I bought some 6 1/2 pioneer TS-A1680R 4-way speaker for my fronts and 6x9 pioneer TS-A6970R 3-way speaker for my rear. i had a sony deck (forgot the type) but it was a simple deck. the only feature it had was that it changed colors. they use to hit hard for just being some speakers. but that deck got stolen so i bought a Pioneer DEH-P2600. IT SOUNDS LIKE CRAP. i've tried to set all of the setting to see if it will sound better but no...it doesn't. what can i do? there is no bass, sounds wierd all the time. what can i do to make them sound better? get an amp?