The thing is I have (4) subs, 2 are very high quality, loud, clean, fast and tight Earthquakes. The other 2 are JBL's, they are decent, but I am more critical with music when it comes to detail, on HT where it's more boom, I thoght the JBL's would provide added bass to the QS-8s, instead of just sitting there. If they were wired in sequence with the QS-8s I think My rear bass would sound better, (more of it) right now they are just collecting dust!!

Sunfire amps & processor Sammy 50" Crown amp 2-SVS SS Maple Ultras, Axiom 60s,22s,150cc, QS8s