skimrn OP6 posts01-01-2019 8:48pm@m-db, My amp is Marantz PM-10, it does have "Power Amp In" for Preamp, would that work? I thought I needed an "Out" for sending signal to the powered sub L&R.Skimrn, Looking at the Marantz PM-10 manual, page 5 shows the rear panel item 2 "AUDIO OUT". This output is labeled (RECORDER) output which usually outputs the full (all the way turned up) signal. Try connecting these L&R RCA connections to the subwoofer with the subs volume turned almost off then slowly increase the volume.
BTW, the PSB 3Ts does look nice!
If this works for the subwoofer you can purchase a pair of affordable long RCA cables from MonoPrice or Blue Jeans cable to locate your sub anywhere in your room.