You might try connecting your projector to Output 4 on your Radiance Pro 4444. That output is set up for Video only output by default. Not sure if this will help, but it might overcome an HDMI capability issue.Thanks.
I may have pulled the input 5 HDMI out (will check behind rack tonight).
However, to clarify, the non-optimal audio is coming from sources #1-4 , so I wouldn't suspect (?) that the input 5 would cause that in the other inputs.
Appreciate the assistance troubleshooting.