Amazon product page says this has usb connections on front and rear, but the pictures and detailed spec do not show/mention this. can anyone clarify?

I have an 8220 and I can tell you there are no USB ports on the front or the rear. Zippo.

Why is this amp so quiet, particularly on bluetooth? i have to turn it up to 50, i’m order to get the same volume that i get from my 35 year old onkyo

I don't know. I have the same problem but manage by turning my phone volume up to about 95% and cranking up the amp. I works well once you get used to it. Don't forget to turn the amp down before switching back to tuner.

what is the (B) for? Is this a more powerful version?

Mine is 100W/channel, the same as the 'B' product. It might be the multi room, whatever that is, since I can't find any reference to it in my instruction manual.

Manufacturer	ONKYO
Item model number	TX-8220-B
Product Dimensions	32.8 x 43.5 x 14.9 cm; 7 kg
ASIN	B075RGZC8G

Onkyo TX-8220(B) Stereo Receiver (Hifi Amplifier 100 Watt/Channel, Multiroom, Bluetooth, Streaming, DAB+/FM Radio, MM-Phono Preamplifier for Turntable), Black

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