The 306 uses 8 of the Burr Brown DAC chips and the 303T uses 4, the power supply is superior in the 306, the chassis is all one material (aluminum) and is of higher integrity than that of the 303T and several unspecified internal components are of a higher grade material and construction. The 303T substitutes the 24/192 USB input for the Balanced XLR on the 306. This info comes from a Cary technical staff member. $6500 vs $8K creates a confusing marketing situation to me. Are they trying to steal Esoteric's thunder with this close price point give and take away strategy?