There are several DSX modes.
Sorry Adam to have to contradict you, but on the 5007, there is only one mode called Audyssey DSX and this is the one I am talking abaout.
Some intended for 5.1, some for 7.1 and some for 9.1 It is dependent on the input source material,
Sure, I agree. But when you have a 6.1 signal this Audyssey DSX mode should engage BS speakers, but it doesn't. When (even) if you consult the manual, this should be the case.
My 5007 produces great sound from the Surrounds and Surround backs in many DSX modes.
, but these are not pure
Audyssey DSX modes as they are always "something" + DSX (for example DPLIIx + DSX).
I suspect you may have a configuration problem, bad Rcvr or possible misunderstanidng of the sound modes.
In the first place, this is what I also suspected, but (very fortunately), this is not the case and everything is OK... (and I confirm that I don't have Zone 2 or 3 activated and/or I'm not in biamplification).
Can you produce white noise from the rear surrounds using the calibration tones?
Sure yes, BS (speakers) were detected during calibration and are perfectly working when not in pure Audyssey DSX mode.
Want to try by yourself?
The mode is called Audyssey DSX and it can be switched between either SB+FW or SB+FH, through the usual "SP Layout" button.
In my opinion what is really frustrating with this 5007 receiver is that it is one certainly one of the best products that I had so far, as I change receivers/amplifiers every year and on this particular receiver, both Audyssey DSX FW or DSX FH are exceptional modes in their own individual kind...
So it ends up being a shame that the user can't combine them due to some "unknown" and exclusive Onkyo reasons, as the Denon 4810 doesn't suffer of the same limitation.
And my VERY humble opinion is that the above exposed limitation in pure Audyssey DSX mode, is somehow linked to the global impossibility of having FW and FH channels working at the same time on the Onkyo 5007!
Have a nice WE,