OPERATING INSTRUCTIONS FOR GAMBIT DAC2 24Bit / 192kHz D/A CONVERTER OPERATION
Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 6
Dual Wire / Single Wire
Factory setting is on single wire as shown below:
For dual wire format remove the 1
st
jumper:
In dual wire format the XLR connectors are
channel 1 input or output respectively and the
RCA connectors are channel 2 input or output
respectively. Inputs / outputs can not be set in-
dividually to dual wire mode. Dual wire mode is
active at 176.4 or 192kHz only.
Bit Transparency Check
The DAC2 allows to check the player software
running on the computer for bit transparency.
This is done by playing a test audio file on the
computer. The DAC2 then checks whether it re-
ceives the special bit pattern from the test file.
This check is running in the background of the
DAC2 software, i.e. as soon as the DAC2 detects
such bit patterns it flashes three of the LEDs on
the frontpanel. I.e. the flashing LEDs indicate
that the player is indeed bit transparent.
There are a total of 12 files for bit transparency
check, one for each sampling rate (44.1, 48,
88.2, 96, 176.4, 192 kHz) and for 16 and 24 bit
wordlengths. We suggest to start with testing
the 24 bit wordlength. The files are in WAV for-
mat which is an uncompressed format supported
by most players. They can be downloaded from
our website as indicated below under “Firmware
/ Drivers”.
If the player does not seem to be bit transparent
this can have several reasons, such as:
- a volume control not at 0dB gain
- an equalizer
- a sampling rate conversion
- a “sound enhancer” feature and more
Make sure all these processing elements are by-
passed. Particularly the sampling rate conver-
sion can creep in “unnoticed”. I.e. the measured
sampling rate in the “Weiss Firewire IO” window
has to match the sampling rate of the file
played, else a conversion is going on in the op-
erating system. For iTunes there is another thing
to know: Whenever the sampling rate is changed
in the AudioMidi setup or the “Weiss Firewire IO”
window, the iTunes program has to be restarted
to gain bit transparency again. For iTunes run-
ning on a Mac computer a program like Sonic
Studio’s “Amarra” is highly recommended. With
Amarra it is possible to switch the sampling rate
in Audio- Midi (i.e. in the DAC2) automatically
depending on the sampling rate of the file
played. Amarra works in conjunction with
iTunes.
On a Windows based system the use of ASIO or
WASAPI is highly recommended. These systems
make it simple to achieve bit transparent play-
back. In addition the sampling rate of the DAC2
is switched automatically depending on the
sampling rate of the file played. Note that the
test audio files do not generate any audible au-
dio signal. This makes sure that your speakers
are protected when doing the test.
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