I did this the wrong way...bought first then asked questions. I have an Alpine 164BT head unit, Infinity Kappa 4x6 RMS 60w 2 ohm speakers in the dash, MB Quart ZCI-216 6.5 120w RMS 4 Ohm speakers in the doors, and I bought 2 SoundQuebed HDS 2.110 dual voice coil 4 Ohm 600w RMS sub woofers not yet installed. I also bought an Alpine PDR V-75 5channel amp. After I bought it I called Alpine and they said no way. Fortunately I was able to return the amplifier. I thought I was doing all the right research, but, I failed miserably. Alpine told me I needed 2 amps to power all of this. My problem is what amps? Alpine said 1200w mono block for the subs plus another 4 channel for the rest. They suggested their PDX M12 and their PDR F-50. Very expensive. I care more about good sound than how loud I can get it. I thought I understood all the numbers but I did not. I would appreciate any help I can get. I would like some brand suggestions as well. This is all going into a standard cab full size truck.