11
Analog Input
The analog input is routed either through the volume control or
bypasses the volume control. This is a menu setup. Part of the
technology included in this DAC may offer some improvement to
any analog source passing through in the form of noise reduction.
Do not be surprised if your analog source has never sounded better.
RS-232 Interface
The RS-232 input is used for controlling the DAC or volume control
using a remote system. It is a standard stereo headphone jack. It is
shown in the upper right hand corner of the back panel as shown to
the right. The complete table of RS-232 commands can be found
under the support tab of our web site.
Optional Clock Interface
After years of experimenting with inputting and outputting clocks we
now strongly recommend never using an external clock. A low jitter
clock must be physically close to the DACs. There is no lower jitter
clock than the MSB clocks, and even if there were, once the clock
was transmitted from an external box so much jitter would be intro-
duced in the cable that the clock would be marginal at best. So we
are confident that no benefit would be gained from an external clock.
A different set of problems exist with outputting clocks. A paradox
is created as a source needs a clock to transmit data, but when the DAC sees the data, which can be at any sample rate, it adjusts the
clock to match. The MSB Transports can handle this as the PRO I2S interface is smart and negotiates the proper clock to be sent back
to the transport. But, if you do have a need to access this clock, it is output on the PRO I2S input. The interface is a LVDS format
clock interface with a signal level of 250 mV pp.
Pin Identification -
The pins shown in the figure below are identified as follows:
1. M Clock + (Positive side of balanced Master Clock)
2. M Clock - (Negative side of balanced Master Clock)
Clock Frequencies -
The output frequencies are as follows:
· 44.1, 88.2, 176.4 or 352.8 kHz sampling frequency source outputs or inputs a clock frequency of 22.5792 MHz
· 48, 96, 192 or 384 kHz sampling frequency source outputs or inputs a clock frequency of 24.576 MHz.
This Clock Adapter plugs into a MSB PRO I2S input and
provides a Master Clock output.
The RS-232 connector is in the upper right of the back.