What is the Current Guidance on Stereo and AV Configurations

Connect the AV front L&R outputs to your stereo bypass inputs. Check for consistant phase between the stereo and AV outputs. This can be done by connecting only one channel through the stereo preamp and the other through the AV amplifier and making sure you have a strong central image. If you don't you need to reverse the terminals of the front left and right speaker connections.

Once everything is hooked up correctly with the proper phase you then adjust the levels of the front speaker for consistent output volume with the rest of the AV system.

Having done a bit more digging.... how many "boxes" are you all typically using? This looks like a 2-box solution with an integrated amp and going up to insanity from there.

The one bit that I'm chewing on is that the AV Receiver is heavily underutilized if it's only driving the center speaker. So, I looked at monoblocks but that just adds so many pieces to the solution.

First of all @kaizen28 I will say you can truly have the best of both worlds and anyone that says otherwise is stuck in the dark ages.  HT Bypass is a game changer for sure.  ignore the noise in here and pay close attention to the list @tony1954 posted above.  BUT having reread your initial thread 2.0 vs. 3.0 is kind of a nominal move.  In that case I would buy a well used AVR for a few hundred bucks (keep in mind it needs pre outs)  and pair it with anything from the list above. And yes to answer one of your earlier questions that AVR would only power the center, but would feed your new HT Bypass amp bypassing the preamp section.  I run 5.1 with a nearly 20 year old AVR along with a very modern integrated.  

With regard to your last question yes my initial shopping/upgrade plan was to get the best AVR possible.  Once I realized the gains that could be had from pairing the two boxes, I had no qualms about making a bit of extra space.  I built a rack to move to monoblocks if needed, but don't think it's remotely necessary.  Take a look at my system for reference.  

The one bit that I’m chewing on is that the AV Receiver is heavily underutilized if it’s only driving the center speaker. So, I looked at monoblocks but that just adds so many pieces to the solution.

You need the AVR both to do the processing for the L/C/R channels and to amplify the center speaker. If using a monoblock amp you’d still need an A/V processor so would require two additional boxes (and added expense). Your simplest/easiest solution is to just add an AVR if you want to use a center speaker. You never mentioned what model Naim amp you have or if it has a HT bypass — does it?

Hi OP,

Sorry for just now jumping in here. I think there’s at least a small part here I can help you with:

2. How much of a difference does a center channel make for video?

My first real jobs were centered around motion picture sound systems, and I recently built my second center channel speaker.

If all you are asking is whether you should go from 2.0 to 3.0 I’d say no, with some caveats. Originally center speakers in theaters were needed because of the wide variety of listening positions. Customers could be very close to the screen but at extreme left or right angles. Among the goals of Dolby Surround (later called ProLogic and then again Dolby Surround for homes) was making sure the dialogue and center effects stayed in the center, in addition to adding surround effects tracks.

Along the same lines of thinking, I recommend a center as important when you have a variety of seating positions (which I do) and your screen is particularly large / speakers are very far apart relative to the screen.

I watch a lot of Netflix as well as Amazon prime and DVD/BD movies. One weird artifact of switching among these services is I discovered that my Anthem MRX 540 absolutely will NOT use the center channel for 2.0 Dolby Digital signals, and there are a lot of Netflix foreign series encoded like this. It DOES use the center for 2.0 PCM / non DD however, which most other streaming services have. Anyway, point is, despite my best efforts as I switch around from Netflix and Amazon sometimes the center is working and sometimes it is not and I can’t really hear a difference unless I’m off axis.

In your case, without an integrated capable of HT bypass I’d say absolutely not worth it.