Do I need a sub?

If you don’t use a high pass filter the towers are going to run full range. If you want to add a high pass filter you can add this! I used it when I had a sub with no  high pass filter with great results!
http://www.hsuresearch.com/products/high-pass-filter.html

Just checked the website, the speaker terminal hookup “is” a high pass filter.

 Monoblocks to speaker terminals on back of sub,......then speaker terminals to tower speakers.  This is how I will hook up.

 Only problem is the long speaker cable runs, 

thanks for all your help.

They label it as high level input?

Ok, talked with Patrick from McCormack audio this evening.

 I’ll set up the sub, and use a single rca from one of the main out rca’s to the single rca of the sub.

 This will b all I need, just a little bit of low end, to balance out the sound.
 Full range for the towers, and just a little bit from the sub, configured by the knob on back of the sub for the  frequency.

 I just need a little bit of low end to balance out the sound, as it sounds great as it is, so just adding a small 10” sub will balance out the sound perfectly.

thanks for all ur help guys!