actually rm 3xx JVC 4 channel amp is the first step to boost your aftermarket speaker performance. add in sound deadening should improve your speaker setup.

expect your Head Unit to perform good bass without amplifier driven is kinda hard.

Buy this unit, http://www.lazada.com.my/jvc-ks-ax3204-drv...19513.html?ff=1

I end up buying two units for both of my cars. I bought amplifier wiring kit and Do It My Self.

JVC 4 channel amplifier with 60W per channel which is more than enough to drive your component and rear speaker.

I use this amplifier to drive my front Focal 6.5" component and rear Focal 6.5" two-way speaker. Works perfectly. If you want extra bass, I've had install Kenwood active subwoofer to the extra kick. But you still need to add in sound dampening such as Edifier ones. Reduce the metal shaking sound.