Bob,
Thanks for the link to Greene's web site.
I've found the Velodyne SMS-1 to be very effective with my HGS-15. I cross at 80 Hz to KEF Reference 104/2s; the result is sufficiently seamless experienced listeners cannot identify the sub as a separate sound source. I also highly recommend setting subs on an Auralex SubDude for isolation.
Thanks for the link to Greene's web site.
I've found the Velodyne SMS-1 to be very effective with my HGS-15. I cross at 80 Hz to KEF Reference 104/2s; the result is sufficiently seamless experienced listeners cannot identify the sub as a separate sound source. I also highly recommend setting subs on an Auralex SubDude for isolation.