[KJDJ]

Headline,
All a CD EQ switch does is jack up the highs about 3db at 6khz, 6db at 10khz.
All of which can be done with your graphic EQ.

The 15's in you cabinets are not subs. Subs handle about 150hz and down. your speakers crossover at 1.2khz so the 15's are handling 1.2khz down to about 50hz. Your towers are "full range" cab's.
Most of the grunt happens at 80hz and below.

You won't be happy Bi-amping this way. The 22xt will only handle 60watts for starters. I am assuming your need for a CD EQ is because you already are lacking highs so why add more bass power?

If want in your chest grunt bass just add to your setup. A pair of 8ohm 18's and about a 1000watt/4ohm amp