This is a video presenting the different connections between a computer and a DAC - Home Stereo. Bluetooth, USB and Optical connection, which one is better?
For all of you guys who would like to find out more there is a great comment from John Scott (see below) - he deferentially has the knowledge on the subject!!! Go check it.
Cambridge Audio DacMagic Plus
Vincent Stereo Preamplifire SA-31
ARCAM P85 Power Amplifire
Tannoy 637