Home Theater Receiver recommendations for B&W 803S?

@awilder

Congrats on the purchase! I think you made the right choice. Since the RMB-1585 is huge and very heavy I suggest you put it on an amplifier stand on the floor. The Rotel RMB-1585 never runs hot no matter how hard you drive it. It stays cool the whole time.

You will be happy with its performance has plenty of muscle and unlimited power reserve to drive just about any speakers and it will sound good on your B&W 803S. The noise floor is surprisingly very quiet especially for the price.
This amp is much better than your Denon receiver’s internal power amplifiers or any receiver’s internal amplifiers.

Now you just need to purchase good quality analog interconnects to connect from your Denon receiver’s preamp outputs to the inputs on the Rotel RMB-1585 amp. Do not skimp on cables. I would suggest that you also upgrade the power cord. The stock power cord wouldn't do a good job.

Later down the road you can sell the Denon receiver and get a good quality AV preamp surround processor (pre pro). The recently discontinued Marantz AV8802 and the discontinued Classe Sigma SSP version 1 will be a great choice. But the Classe Sigma SSP version 1 (not Mk2) does not support 4k video, Dolby Atmos, DTS-X & other latest formats & codecs so it can be had for around $2500 to $3k range in used markets. The Classe Sigma SSP Mk2 supports 4k, hdcp 2.2, Dolby Atmos but you will probably end up paying more or even full price $6k since it support The latest formats. The Marantz AV8802 supports 4k hdcp 2.2, Dolby Atmos, DTS-X, Auro 3D and can be had for around $2k to $2500 in used markets since it's recently been discontinued. 

IMO the Classe Sigma SSP will pair better with the Rotel RMB-1585 amp cause the Rotel RMB-1585 is warm with smooth highs and isn't the last word in resolution, inner details, nuances and transparency. The Classe Sigma SSP is very transparent, excels in detail retrieval, nuances and resolution. The Sigma SSP sounded very resolved, fast and clean. So it will compliment the Rotel RMB-1585 warmth liquid and fluid sound. The Marantz AV8802 however is somewhat warm and the details, transparency, nuances aren't as good as the Classe Sigma SSP. Therefore, the Classe Sigma SSP will pair better with the Rotel RMB-1585 amp. 

Let us know of what you think of the Rotel RMB-1585 amp once you receive it. 

I have the Rotel rc and rb 1590. 👍. Check out Darwin cables. 

@bwguy 

I wouldn't use Airplay eventhough it is lossless Apple Airplay. 

@maritime51 - Thanks, though it looks like Darwin is quite a ways out of my price range...and I’ll need 5 of these cables. (yikes)

@caphill - Yep, thanks. I’m very excited to listen to the new system! Just have to wait for trucking from Canada... :)

At this point I’ll have to go with RCA interconnects because of the Denon, though I’ll probably want to upgrade to XLR once I replace the Denon. So it doesn’t make sense to spend a ton on these cables. I’m thinking of the Blue Jeans RCA’s - about $100 for a set of 5.
https://www.bluejeanscable.com/store/6channel/index.htm

As for racking, I need to go with something low and wide because of my TV and projection screen setup and space in the room. I currently have an HTM2, but am hoping to replace it with the larger HTM3S, so I need a good, wide shelf for it (that doesn’t interfere with the TV or the screen that drops down in the about the same plane).

Right now I’m toying with the idea of the Salamander Synergy 245... But instead of having the full-width top, getting single-column tops (on the taller cabinets left/right), and leaving the middle shelf open. Then my center speaker will have plenty of room to breathe, and my TV can straddle the shelf (the feet are on the sides).  It just... might...work...
https://www.salamanderdesigns.com/av-cabinets/synergy-model-245/

Congratulations!!!  I look forward to your results!!
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You sure can do the Blue Jeans cables.  They are likely going to be better than the crap RCA cables that typically come with TVs and stuff.  But keep in mind these are also a compromise and will not allow your Denon/Rotel to "sing".  I tried some of the Blue Jean "Beldon" 1694A cables for interconnects.  They did have good resolution and authority, but the sound was just "meh" in emotional engagement.  There are so many better cables, but of course they cost more. lol.  Still, if you are doing this as a "temporary fix", it's still better than other alternatives.  One note on these cables - the LC-1 cable is a single solid-core 25awg conductor.  Great that it's solid-core (much better than stranded).  However, in my testing, the smaller awg conductors had good high frequency response, but just did not let the music "breathe" and they also had weak bass impact.  You really need to look for a minimum 21awg solid-core interconnect (which is what Audioquest are).
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As far as the Salamander, I would say get whatever works.  But keep in mind that even though caphill says the Rotel amp does not get hot, you still need adequate ventilation above the amp and open space on the front and back of the amplifier.  When caphill says "the amp doesn't get hot", he really means that "it doesn't get roasting hot like a lot of high bias Class AB or full Class A amps".  The Rotel will still warm up some and it's always best to allow for heat dissipation.