12Stepper - What are your trying to use the 2nd HDMI output for? If the answer is to send a single source to two different monitors the answer is probably no. You would need an HDMI splitter for that. If your objective is to get a single additional hdmi video source to the 975 and out to your TV, then the answer is yes and you can use the 975's Aux configuration for that). If you want to use analog video instead of digital for some of the 5 975 input devices that can also be accomplished. If you are looking for more than 5 and less than 8 video inputs then the answer is probably yes but it is certainly not user friendly and requires manually switching of the HDS-42AVR's input.
The reason, I am sure that this will work is that per the standard configuration, there are two HDMI lines going to the TV: 1) the passthrough output from the HDS-42AVR which will switch up to 4 HDMI sources and 2) the 975's HDMI Output/ARC input. Per the manual at a minimum the ARC line is used for 975 console settings. In my case I have HDMI 1 on the TV connected to the HDS-42AVR and HDMI 2 connected to the ARC line. The ARC line can send digital and analog video input to the TV (analog works through the 975's autoscale feature).
As background to the above, I recently purchased and installed a TE HDS-42AVR from Outlaw to fix a communication problem between my 975 and Plasma TV that resulted from an electrical hiccup. After the incident the 975 would not send a signal to the Plasma or conversely the Plasma would not accept a signal from the 975. Both worked fine with other devices including a cheap 32" Visio TV. I could also manually connect my source devices to my TV's HDMI 1 input and the HDMI 2 ARC to the 975 and get audio on the 975. While this solved my needs, I wasn't comfortable asking my wife and kids to switch HDMI cables on a regular basis. I tried replacing the computer and HDMI combo board on my Panasonic Plasma which should have worked but didn't (bye-bye at least $200 in labor plus a restocking fee on a $400 board).
Various manual procedural fixes suggested by Outlaw and Transformative Engineering also failed. Finally, Jason from TE suggested I try the HDS-42AVR from Outlaw as the cheapest and best solution. It fixed the problem.
Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 975 pre-pro running 5.1 system via HDS-42AVR
2 Ch Parasound HCA-1200II amp 205wpc for NHT VT-1.4 mains
Outlaw 750 for NHT VS-1.4 center and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
Panasonic Viera TC-P60ZT60 via HDMI from HDS-42AVR & to the 975 via ARC
Samsung BD-D5500 BluRay via HDMI to HDS-42AVR
Arris 6 Channel whole house DVR via Time Warner Cable via HDMI to HDS-42AVR
Family Room/Kitchen 24x15
NHT SB-2 Main - Outlaw LFM-1 Compact Sub
Squeezebox v3 Classic
Visio 32" HDTV via Arris HD Cable Box