What issues did you have with the htp-1? How did it sound vs the 8500? Would you have kept it minus the issues?? Looking at the 8500 and htp-1 personally. Like to get more of your thoughts.\n\n\nSo, issues-wise, the unit had to be re-booted a couple of times. Mind you, there is no easy way to reboot it. You have to download the software onto a USB stick and reload it from there. Needless to say, all settings get wiped out and you basically have to start over again as if it were a brand new unit. I returned the unit when it kept restarting itself and became unusable. Monoprice was going to send me a replacement unit. Also, I could hear what I would describe as digital artifacts when switching inputs. Both of these things are unacceptable in my book for a $4,000 unit. This could very well have been a problem isolated to MY unit but 1st impressions are the ones that count.\n\nThe 8500 just works. Easy to setup. I think the HTP might be a little more adjustable on a per-channel basis but not something I needed. Both units sound awesome, but I have a well-treated room and my speakers are a little above average. I had the units a few months apart and there is no way I would try and say how I remember how one sounded over the other. Having had both units, I'm super happy with the Denon. It's an absolute beast of a preamp, and has great amplification to boot. I do use separate amps all around and only use the 8500's amps for my Atmos channels but thinking I may put some of those channels to use in other zones.\n\nI will also add, the Denon HEOS app for streaming music absolutely sucks. It doesn't play nice with Amazon music. Doesn't download or import your playlist. You basically have to search for stuff and play it. Can't build a playlist. It's minor but, when I select the HEOS input to stream, the receiver displays a message of "No Network Connected". Everything works but the message is displayed. Currently waiting on Denon support... It's a minute thing but at this price point, it should be perfect. \n\nI am still searching for an easy way to stream HD music with a nice interface.