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I was going to suggest the Raumfeld, but I have done quite a lot, and I have nothing to reference it against. I will say I think it sounds great, but I suppose I can 100% recommend it due the fact you have an 8 week trial if you buy it.
I am probably not astute enough to notice the delicate difference between a system that's good or bad for heavy music, but Pantera and Metallica sound good to me from this unit.
It's dnla compatible, spotify connected, tune in radio, and something I particularly like is you can rip albums and copy them to a USB and play direct from the app, flac or other formats. It has RCA out and optical if you got a better DAC. I'm surprised after buying one that it's not a more popular unit
I had the vanilla version of the Pioneer N-50 and the control app and lack of meaningful firmware upgrades were shockingly bad. The sound was pretty decent though and I listen to a fair bit of metal. I've since upgraded to the Yamaha WXC-50 and yes I view it as an upgrade over the Pioneer. Shame Yamaha isn't a brand you like... Marantz streamers I've never heard.
Edit : And regarding Insider9 second point about real improvements coming from speakers, again I agree. Metal was muddled amd mudded with my previous speakers, the PMC Twenty 23's only when I changed these could I really enjoy the genre.