Following the advice of the expert who installed my Velodyne HGS-15, I set the pre/pro to shunt everything below 80 Hz to the sub, and it had the effect of really opening up my KEF 104/2s in stereo mode and enlarging the soundstage they generate. Integration with the sub is seamless, and you cannot point to the sub as a source of sound. I highly recommend letting the sub do what it does best, and freeing your other speakers of low frequency duty.
db
db