So there is nothing to the thought of one receiver vs another being "warm or cool" Also some are better paired with specific speakers? Let's say you have Klipsch speakers that are very bright, you don't want to pair them with a specific receiver.
I have slight tinnitus and unfortunately my ears tell me the difference between my setups using the same speakers. They will start aching and ringing with HT setup in 2 channel mode.
As I quoted many times, our highly respected Dr. Floyd Toole who said in his
Sound reproduction – art and science/opinions and facts youtube video:
(
start at about 56:30)
Who said
"...the only way we can get those consistent opinion out of you is to not let you know what you are listening to...do it blind....if you know what you are listening to, I don't care what you are thinking, it doesn't matter..."
He's only talking about comparison listening to loudspeakers to determine how they score in terms of how good they sound to a group of 350 people with "normal" hearing. It is widely accepted that it is generally easier to tell the difference between speakers so I don't think we need to debate whether Dr. Toole would have apply the same principle (DBT) for comparing amplifiers.
At about 53:07, he did briefly comment on electronics, citing they nobody would design an electronic component that didn't have a FR that's flat...., flat, smooth..., it is not difficult to do, and everybody does it....
He is not the only audio expert who have made similar points. So with due respect, you heard what you heard, warm, cool, whatever, but it is your subjective experience.
You have nice amps now that were designed to be transparent, so it should match any well designed speakers. The warm sounding amp to match bright sounding speakers are one of the biggest audio myth, it is not just my opinion, but facts if you consider the kind of amps they you have, that again they are transparent, but all well designed/built amps should be transparent, including your SR6010. It you match them, any of them, with speakers that are known to be bright, you should apply EQ, or even simply tone control to your liking. If instead, you pick an amp that is supposed to sound "warm", then even if it is true, how do you know it would just "warm" enough to that particular speaker. How practical is it to find such a match if you want to hear each combinations, and if not, are you just going to go with internet/magazine hearsay?
Anyway, it is probably no point debating this everlasting point, so back to your question on which ARV for you HT, with Atmos capability. I would say if you are okay with the SR6010, you probably can do no wrong going with a SR6015, or 7015. If you are the objective type who trust specs and measurements, the the AVR-X3700H ,X4700H or X6700H will give you more value (better measurements) for less $.
This is an updated review of the Denon AVR-X6700H. I tested an early production 6700H a few weeks ago and found lower than expected performance. Denon Engineering traced this to a faulty capacitor( or capacitors) used in the initial run of this AVR. I requested an updated unit which the...
www.audiosciencereview.com
Current ranking of AVRs and AV preamp/processors preamp output by THD+N, HDMI input, tested by ASR