With this setup:

Front L/R: Small
Center: Small
Surr L/R: Small
Surr Back L/R: None
Subwoofer: Yes

I set the surround mode to Bypass and still got full-range out of the sub.

gonk,

I'm trying to determine if my system is acting different from yours.

When you have your setup as above, do you get any choices for Subwoofer other than "Yes"?

When you have either of the following setups:

Front L/R: Small
Center: None
Surr L/R: Small
Surr Back L/R: None
Subwoofer:

OR

Front L/R: Small
Center: Small
Surr L/R: None
Surr Back L/R: None
Subwoofer:

Can you change the subwoofer mode?

I'm assuming you use a powered sub with it's own internal xover. If so, is it possible to bypass the sub's internal xover, then try playing an analog 2ch source with the surround mode set to stereo.

Thanks!