i too want more info on this. I am working with a RSD 6.5 comp set, and a concept audio CC-1252 with the components just hooked up theh regular 4ohm per channel way.
The gain is right around halfway turned up on the amp.
Concept 2 channel CC-1252 amp
Here are its specs:
4 Ohm Stereo Power (RMS): 125W X 2
4 Ohm Mono Power (RMS): 400W X 1
2 Ohm Stereo Power (RMS): 200W X 2
Signal-to-noise ratio: 100 dB
Frequency Response: 5 Hz - 50 KHz
Total Harmonic Distortion: 0.05%
Input Sensitivity: 200mV-4V
Length: 11.82"
Width: 11.66"
Height: 2.37"
Continuously variable 0 - 18dB Bass Boost
Built-in continuously variable 18dB per octave crossover, from 50Hz to 250Hz
Platinum Connectors
they are hooked up to the passive supplied crossovers, with the switch on it set to 0 (instead of +2db)
The amp is set on full range mode, (instead of HPF or LPF), and both the LPF and HPF knobs on the amp are turned all the way counter clockwise (so off)
The head unit I am using is a Pioneer Premier DEH-P640 (yeah alittle old):
http://www.pioneerelectronics.ca/POCEN/Products/Car+Audio+Video/Source/CD+Receivers/DEH-P640?tab=B
The doors arent sealed yet (only the outer skin is deadened with 1 layer of Peal and Seal)..im still trying to decide how i want to seal my large holes, and deaden the inner layers.
But with all of that..i figured the RSD set would still sound better than it does....im afraid to really turn up my head unit for fear of blowing something. (i dont know why, i guess just being a noob). It sounds kinda flat.
If anyone can look at my HU settings, and read what all i have done, any help in pointing me the right way on setting this up would be appreciated.