the QC sub will play a little lower than dc's (which is almost identical to the old CW)
I installed 6 QC 12's in a Full Size blazer and he had good Response all the way to 30hz, box was tuned 35--he competed in meca... did 148-149db at the headrest at 42-45hz...
the woofers are capable of low freqs.. it's all going to be dependent on box size and tuning (don't follow box suggestions in owners manual if you want low bass)