I have a Denon AVR-4082R. I am using it with 5 speakers and a sub. The front mains are Polk RTI-12s which need more power, as they have little bass with only 100W driven.

I want to use the RTI-12s bi-amp capability with the 4802R's Zone 2 output to give more bass response.

The manual is clear on how to connect the Zone2 terminals and how to enable it in the menu.

In Stereo mode this works wonderfully. Room filling wall shaking bass with no sub woofer (large open floor plan, vaulted ceilings).

In Surround mode though there is no output from Zone 2.

Am I doing something wrong? Is there a firmware fix for this?