guys, i need recommendation on upgrading my ICE. currently using MB Quart discus 6x9 3 way speaker at the back, and Boschmann Clarity Concept 6.5" 2-Way Component, JVC headunit. thinking of getting an amplifier to get better sound quality, any recommendation? i was thinking of getting JBL gto series, is it good?

im into hard rock, and some pop music like MJ, abba

thanks in advance