also in the process of saving money and configuring a full stereo upgrade such as head unit, amp, and 10" sub with better door speaker. Specifics, door speak 3-way, freq between 30-45hz (to hit ok lows) with at least 50w rms and sub between 15-25hz.(to really hit them lows), at least 150w rms, mounting depth less than 4.5". Amplifier pushing between 200-1000w at 4ohm but is capable at 2ohm and is bridgeable so either a 2 or 4 channel. but in reality looking for anywhere between a 300-500 watt sound system that way i dont drain my battery and kill my alternator faster.