If you get a second amp for the 901's you can have your cake and eat it in front of the TV too.
ONE: dedicated 901-RX-V850 stereo-analog-audio only:
If you want to have the Yamaha also support non-901's as the second set of Front Speakers, put the Active Eq in one of the three selectable Tape Loops. That way you can dial the 901 EQ out of the equation and select the 'normal' speakers for your Dolby Surround video experience.
Now imagine this:
TWO: 901's for the Front on a 100wpc stereo amp, your RX-V850 or a nice digital AVR driving center and rear, maybe 'normal' fronts, too
Get a nice 100wpc amp with its own volume control on eBay and slave it off the Yam. Remove the Front Pre-Main jumpers and place RCA Y-splitters in there so the pre-main connection out is maintained but shared with the Active EQ, which is in series with the 901's dedicated amp. Use the new amp's volume to match the 901's to everything else and you just have to turn it on or off to enjoy the 901's along with or instead of the 'normal' front speakers. You could even just disable them at the Yam.
Now for some boilerplate I created to get your creative juices flowing ij case you have a digital AVR in mind for the future:
Having a 901-based multichannel setup myself, I would highly recommend getting the Full Monte for video listening (below)...
In that case a separate stereo amp for the 901's would work. I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers and the Rear Surround channel, with the Active EQ between the receiver Front L&R Outputs and the 901's amp channels. My receiver controls everything and just drives the Center and Surround speakers.
You could get by with just a stereo amp for the 901's. A Carver M-200 is a good efficient amplifier that would have you cooking just fine (2x100W). Run it with the Active EQ between the receiver Front L&R Pre-Outputs ** and the 901's amp channels.
** Front Pre Out (or one of your analog Tape Outs) >>> Bose EQ Amplifer IN, then
Bose EQ Amplier OUT >>> new amplifier IN.
Then set the new amp's volume control (if it has one, mine doesn't) to something HIGH and run through your speaker setup routines on the Yamaha. After levels and distances are set the Yam will be the boss of the 901's. I recommend sharing or directing any LFE with them. With 901's don't even need subwoofers but they don't hurt.
I've done this in my own setup once. Turn the 901's around so the rear faces point into the listening area. Crank up Master and Commander and when the waves are crashing or cannon are firing you WILL FEEL A BREEZE from them. Now THAT is multi-media!