Utdrag fra test.

DAC1 USB is virtually immune to jitter issues. I
spoke with a tech from Benchmark, and
asked for a layman’s explanation of how
their anti-jitter system worked. Elias gave
me the following explanation that outlines
the broad details of what is occurring in this
DAC. When the D to A converter receives
an incoming signal, the first thing it does is
separate the clock signal from the data
stream. The clock information from the
source unit is completely abandoned. The
data stream is then passed onto the Delta/
Sigma converter, where it is up-sampled to
110 KHZ, and optimized for the internal architecture
of the unit.
When the data stream leaves the Delta/
Sigma converter, a new clock signal must
be generated and synched to it. Benchmark
employs a high precision clock in order to create a properly synchronized data stream. The digital to
analog conversion stage is the next stop, and this is the point where the data stream is transformed
into a conventional audio signal. The analog output stage is the last stage in the unit, and this is
where a set of op-amps are responsible for generating the final gain portion of the DAC.. Since the
Benchmark DAC creates its own clock signal, the quality of the transport is not as important to the
overall sound. Benchmark claims that the DAC1 USB will sound the same with different types of
transports. From a practical standpoint, a traditional CD transport or DVD player will sound just like a
hard drive based source. Now the sole purpose of the transport is to provide a data stream to the


Data stream is transformed into a conventional audio signal - er det 16bit/44,1khz eller 24bit/48khz ? På prolyd sin nettside står det : uppsampler til 55khz, halvparten av 110khz intern uppsampling.