I would not worry about usb cables, whatever some may say: http://archimago.blogspot.nl/2013/04/measurements-usb-cables-for-dacs.html
Bluetooth is not a very good connection. If you want to stream from your tablet/smartphone, why not get a Chromecast Audo and use its optical digital output? See here for details: http://archimago.blogspot.nl/2016/02/measurements-google-chromecast-audio_27.html
Bluetooth is not a very good connection. If you want to stream from your tablet/smartphone, why not get a Chromecast Audo and use its optical digital output? See here for details: http://archimago.blogspot.nl/2016/02/measurements-google-chromecast-audio_27.html