I am quoting Stan from the art of sound forum "The Bushmster is based on all the good ideas and mods of the previous designs, plus some new ones. There are no muting relays and their driver circuits. There is also no line output output stage. So no line output opamps and associated caps. It's a DC line output after all so no caps in the signal path to the output RCA sockets. There is also no variable output. The input selector circuit has also been simplified from a multi transistor, latching circuit, and selector diodes, to a microcontroller . And yes, I have used SMD where possible. They proved to be far less noisy in the TC-7510. The power supply is also far more compact due to the use of the latest generation LDO regulators. Those things are a mere fraction in size to the 78XX regulators that they replace." according to him this DAC will be one of the best. Though it doesn't have USB input and variable out (as of now)The Bushmaster is actually better for a Head Fones Set-up, rather than a stand alone DAC. So am not to sure how it will perform as a stand alone DAC.