Sorry for the delay, apearantly Jensen is moving facilities and could not fullfil a special order to the dealer, the recommended (and thouroughly professional) Cables Solutions). The sought after SUB-2RR never materialized so I reverted to the original, in stock, SC-2NR. What a blessing! Fixed the loop, gave me speaker cable length to play with sub position, and allowed me to tweak with the app, all of which is fantastic.
Add a StellarGold Preamplifier. It has two XLR or RCA outputs. Also, I now am a firm believer in having a preamp in my system. Ask Paul; he is correct.