So... I'm not sure I have enough information to help here, but I wanted to share my experience in case it might get someone who has tested more to pipe up, or to do some more testing before you or others make a purchase.
I picked up a Marantz SR6013 last fall. I'm pretty happy with it overall. The one thing I do NOT like about it is the digital streaming.
First a little context - I've done a lot of testing over the years with various bitrates, and I don't think I'm incredibly picky, but do have some preferences. I tend to find 320 kbps or even 256 kbps pretty acceptable in many cases. That's about where level-matched test start to become more difficult to distinguish from CD for me. I find 128 kbps pretty much unlistenable, and 192 kbps definitely seems lacking. What brought me to Tidal in the first place was a desire for higher bit rates over what I was getting through Pandora etc. a few years back. At that time I was mostly listening (a lot of hours) on a computer through an outboard DAC, headphone amp, and Sennheiser HD650s. I tried a bunch of free and low-cost paid services, for dozens of hours, and just wasn't satisfied. Tried Tidal, was satisfied, and have stuck with it.
So why am I posting? Because I felt like HEOS on the SR6013 was playing at a pretty low bit rate. Even with Tidal, when Tidal says it's not. I did level-matched comparisons (same tracks) with the amp using HEOS, getting output from a computer, and a CD player (both digital and analog). The HEOS just sounded AWFUL to me (iirc, I tried Pandora and Tidal and maybe 1-2 others) . I can't prove anything - there's no way for me to see/say with confidence what bit rate it was playing, but it was consistently bad and annoying enough that I stopped using it entirely and just stream from a computer to it when I want to. I have not retried it with more recent firmware updates. I have no more concrete evidence. But I wanted it to work, had no reason to suspect it would perform poorly, did some extensive (for me) testing, and really felt like their were problems. If you can, I suggest you get more input from others who have the exact receiver you're considering and are using the same service you want to use. Just my 2 cents.
Oh, and I tried both wireless and wired connections if I'm remembering right. Everything is wired now.
