Hi again Health Nut,

Yep the SPL meter has an output, you can connected it to the 861 and use it as a mic. This is what M use and recommend. There are other options and you can use your mic from the Denon. Have a read in the Wiki there is a lot of information in there on this subject.

Regards,
Carl.

861v6+ID40, HD621, 8000.2, 7200HC, 7200.2, SKYQ Silver, PS3, PDP-LX6090, QNAP TS870-Pro (8*6TB), Roon, iPadAir2.
[In Reserve] C15, MD600 (2*3TB), TwinStore RM (2*2TB)