es10 crossover

Need to adjust the crossover freq on my AVR for my HT system.

System:
7.1.4 system
LCR = ES15
SL, SR, RSL, RSR, TFL, TFR, TRL, TRR = ES10
Klipsch SPL-120 (Only 1. I know this sub sucks but it was free (can't afford a different one at this time) and 2 subs are better than 1, but space availability and wife/babies won't allow another.)
Denon avr-3700h
Speakers are set to small
80Hz was the setting Audyssey assigned after calibration.

ES10 total freq is 75Hz-40kHz but there's no way they play anywhere near "good" that low or high.

Should keep the low pass at 80? Raise it to 90 or 100? I think 80 is way too close to the lower limits of the ES10s.

Can't find a -3db rating for the ES10 anywhere (text or chart). Polk CS said it's 75Hz but that can't be true.

Help appreciated!

Comments