Yes - not with native surround sound. A stereo signal is transmitted via Bluetooth, and the outputs on this receiver are stereo outputs. You can activate the 3D effect in your system to calculate an "artificial" surround signal for all speakers.

Yes, a jack or cinch plug with cable to the sound system or the speakers. Quality does not play a relevant role.

It depends on the sending device (mobile phone, tablet, etc) whether it can send to two Bluetooth devices simultaneously.

Yes, it generally works with Bluetooth - regardless of manufacturer or OS.

No, this is a receiver, not a transmitter. So, for example, you could stream music from your smartphone/tablet to your TV/AVR/HiFi via Bluetooth (if it has an audio-only input).