Originally Posted by vercingetorix
I'm having trouble with my subwoofer connected to my SC-68 with a single RCA cable along with a single pair of bi-amped speakers. I was never successful with the SUBWOOFER port located above the FM UNBAL port.
What is the basic fundamental concept I am missing?
First - if you look closely at the rear panel, the sub port above FM is part of the Zone 2 connections. That's why it didn't work
For Zone 1, you have to use the ports labeled Sub 1 & Sub 2 in the Preamp group.
Next - did you try setting your sub to "Plus" in the manual speaker setup menu?
That should do it.
As long as your 2 fronts are set as Large and have no surrounds or center, you will never
hear your sub unless there is a dedicated .1 LFE track on the disc. That's why you hear it with SACD/BD but not CD's.
You can set the fronts to Small with a crossover of 50 or 80 Hz, or set the sub to Plus, sometimes called double-bass. That is the only way you'll get the sub to be used for 2 channel music, even adding Dolby PLIIx surround won't kick it in, unless your have the sub available for re-directed bass.
I'm not sure what else to suggest you try. Regardless if you use Normal or one of the Bi-amp modes, as long as your fronts are Large, you won't get any sub activity unless it's a 5.1/7.1 disc. Your only other option is to use Plus. That forces bass frequencies to be sent to both your fronts & the sub. You may also need to set the crossover in this case: 50 to 80 Hz is good choice for your B&W 800's.
If you already have the sub set to Plus, then something else is going on. Let us know. More screenshots may help.
Hang in there, it's a learning curve but you'll get it Edited by ss9001 - 8/4/12 at 8:34am