Originally Posted by Knight Operator
I cant speak for your speakers, but usually non full range speakers (Def Techs are full range) tend to roll of at around 80hz or even higher very quickly and dramatically. Even though they specify the frequency response is far lower. i have a some speakers that specify a low end of 43hz, yet i still set the crossover to 70 and let my mid bass sub handle that audio, the sound is much better. Heres what i suggest throw on this song: Teisto the storm, it has a great disparity between highs and lows with alot of mid bass so its a good test, and run your speakers without subs one channel at a time. and see how the low end sounds while changing the crossover. Then pulg in the subs and listen again. Really its your choice, but i wouldnt set any speaker below 70hz unless i am sure it will do work at that level.
His L/R speaker specs are:
30° Off-Axis±2 dB
from 46 Hz - 22 kHz
±2 dB from 46 Hz - 18 kHz
Meaning they roll off -2db at 46hz. They are not 'non-full range'. And with the XPA-3 driving them there should be no lack for power even with that low a crossover setting.
Since Audyssey allows you to set the crossover where you want it why not experiment?
Audyssey sets my mains at 50hz - center at 80hz - and the surrounds at 90hz. I use an external amp with 525wpc to drive the mains and could probably set the crossover for them at full range but this works for me.