FWIW - same experience as stevecham with a pair of SVS SB1000s positioned almost exactly as Steve has his 2000s. Mine are used with a pair of Totem Forests and at other times with a pair of Prelude Pluses that occasionally replace the Forests for a change of pace. The subs were bought primarily for use with the Preludes. I’m running speakers full range and with the Forests connect subs via line out from my pre-amp. With Preludes, connecting via speaker in on the subs to speaker binding posts on the Preludes seemed slightly better though I've also used line in from the pre-amp's line out. Have been very pleased with the results. Can't really tell the subs are playing. No directionality from their contribution. Great test track is Flight of the Cosmic Hippo by Bela Fleck and the Flecktones (bass courtesy of Victor Wooten). SVS has a 45 day in home audition period and covers shipping BOTH ways if you don’t keep them; a 5 year warranty too. They’ve been very responsive to email and phone (email even on a Saturday). No personal affiliation with SVS.
https://www.svsound.com/pages/bill-of-rights
https://www.svsound.com/pages/bill-of-rights