polk db691

I have a KenWood kdc - x891 head unit with three sets of preamp outputs (front, rear, sub). I want to power these 6x9's with a concept cc-1252 amp Concept Amp Specs: RMS Power 125W x 2 4 Ohm Signal-to-noise ratio: 100 dB Frequency Response: 5Hz - 50kHz 18dB per octave crossover Input...