Subwoofer Out VS Subwoofer Crossover

@whitneyhengesbach

Points to consider... Your amp is very capable of powering the mid-base drivers of the main speakers no problem. 220 watts into 4 ohm. Plenty loud.

The Polk XT70’s are capable of going down to 35hz/40hz. Why buy speakers that can go this low if your not going to let them? 2-61/2" mid base drivers with 2 8" passives and then cut them off at 80hz and then hand it off to ONE weak 100 watt subwoofer?? Why do that? Huge mistake IMO. The XT70’s are very capable of adding LOTS of punch and dynamics far better than one, weak 100 watt subwoofer can.

An upgrade you might consider is splurge on a pair of better powered subs like SVS or REL and set them up in stereo and then cross them at 40hz to blend properly with your speakers.

Or...

If you don’t add new subs I’d probably set this system up using the speakers full range and leave that sub out altogether. I bet you’ll be very impressed with the bass extension of the XT70’s all on their own. 35hz IS VERY DEEP BASS! No sub needed. Especially not that sub. No offense but you’ll probably make it sound far worse by adding that sub.

Good luck!

Given the new information I agree with @gdaddy1. I would set the system up without the subwoofer running the speakers full range.

If you use the system for video also you could try the subwoofer via the RCA input when doing so. Value of this approach would depend on how low one can set the subwoofer crossover.  Set the crossover to lowest setting. You would likely find yourself sub turning the subwoofer off for music, maybe not using it at all..  

Interesting. No sub. I'll definable try that.

Any input on the Low or Hi impedance setting per these 4ohm?

After looking at this chart, I'm pretty sure it's LOW.