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4 things missing - FM radio, subwoofer out, good headphone amp, speaker calibration. Any regular receiver have them.
I have similar class-D device from Chinese vendors which sounded weird out of the box, and didn't have sub-out. When I tried to parallel connect subwoofer with speakers, the device would produce only very weak sound. The only working solution I found is to put DAC in front of it and feed amp thru RCA from DAC, plus same RCA to subwoofer. So you need proper RCA line out or sub-out, parallel speaker connect won't work. Just warning.
Otherwise these Class-D devices are bonkers - they are tiny, have very little idle current consumption, have auto power on/off by incoming signal. Just let them mature to replace regular receivers.
Max97220a is an excellent headphone amp chip, depending on how it's implemented.
FM radio? Its not a receiver.
well. it has bluetooth radio. so what's stopping it from having FM radio. and 5.1 decoder if we go further. :)
Oh, I see, it already has Bluetooth radio, so why not FM, I get it. So Bluetooth must be like AM radio or those weather channels, huh?
Then it costs three times as much, and is called a "home theater receiver"...
sony's 5.1 receiver was on sale for 150. new one. pretty close