so i've had HK 3700 since it was released, i probably was one of the first to get it, since it was pre-ordered and had to wait on it for what it seems forever, i am quite happy with the quality of sound, and this is my 4th generation of HK receivers within very few years started with 645
which had major HDMI issues for HD video, then the problematic (Protect issue)3600
, then 3650 which was the most stable at least from video prospective
, then the 3700 with all its bells and whistles!
i am pairing this receiver with B&W speakers for 5 channels, and using an older infinite sub SW21 (only one) , along with a Samsung smart TV which supports ARC and optical output. its amazing what this thing light wight receiver could produce. I was real skipitickal at first fearing a commoditized lower quality due to whatever MUCH lighter design, but i was real impressed, be it the power supply, D or A/B class amplifiers !
however, it does indeed have an issue where it will lock up quite frequently when left on standby for an extended period of time, and wont even respond to buttons on the unit itself, or let alone the remote control, when switched off by the power supply switch on the back, or even unplugged from outlet, the amber light stays on for around 10 seconds before it finally goes off, which in my non engineering mind may be due to waiting for a capacitor to drain, if tuned back on before that, it will not work !
i have been rather busy, with hardly time to even report the issue, like i said, i am actively using ARC on my TV to minimize cabling to TV playing Netflix, amazon prime, 3d content, etc , so my TV isn't merely a monitor, but rather a source too, i could try optical out only like i did with my prior receivers, but didn't get the chance to.
i love Airplay on this receiver, though its audio only, i wish i could stream video via it, vtuner is AWESOME, which sorta existed in 3650, WIFI is most convenience unlike my 3650 which had to be wired..
though, regardless of these nifty features, at the very core of what to expect from an audio device quality, this by far had surpassed my expectations for an optimal experience! when Dolby digital is not a source, Pro logic (which never been a preference except with this receiver) or DTS NEO produces phenomenal quality audio,
i hope that helps!