Instruction Manual for DAC3 HGC and DAC3 L with 2.X Firmware Page 23
Analog Inputs – RCA Unbalanced
The DAC3 has two sets of unbalanced stereo
analog inputs with female RCA connectors.
The analog inputs can be used for devices
such as:
• Phono preamplifiers
• FM Tuners
• Tape Transports
• Analog VCR outputs
• iPod and MP3 devices
• Outputs from analog mixing consoles
Digital Inputs - Overview
All of the digital inputs on the DAC3 use
Benchmark's UltraLock3™ system to remove
virtually all of the interface jitter. The result is
that all digital inputs deliver identical audio
performance. The USB, optical, and coaxial
digital inputs will all sound identical if they
receive identical data.
Computer Input – USB
The USB input accepts a Type-B male USB
connector. A Type-A to Type-B USB cable is
provided with the DAC3. The USB cable
connects the DAC3 directly to a computer’s
USB output.
The USB input supports 44.1, 48, 88.2, 96,
176.4, and 192 kHz PCM sample rates at
word lengths up to 24-bits. The USB input
also accepts DSD in DoP 1.1 format.
The DAC3 can be configured as a USB Audio
1.1 or USB Audio 2.0 device. Press and hold
the USB button on the REMOTE for three
seconds to toggle the USB MODE. If a
remote is not available, simultaneously press
and hold both input buttons on the front
panel for three seconds.
The USB AUDIO 1.1 mode does not require
the installation of a driver. It allows a quick
driverless connection to windows machines
when playing sample rates of 96 kHz or less.
In this mode, Windows machines can begin
streaming audio within seconds after the
DAC3 is connected for the first time. No
software or hardware configuration is usually
required.
USB Audio 2.0 is required for DSD and for
all PCM sample rates exceeding 96 kHz.
Windows computers require a driver to
support the USB Audio 2.0 mode.
The USB Audio 1.1 mode was tested for
compatibility with Windows XP, Vista, 7, 8
and 10, Mac OS X, and iPads using the 30-pin
to USB Camera Kit. No driver installation is
required for any of these systems when
operating in USB Audio 1.1 mode.
The USB Audio 2.0 mode was tested for
compatibility with Windows XP, Vista, 7, 8
and 10 (driver installation is required for all
Windows versions). It was also tested for
compatibility with Mac OS X starting with
version 10.6 (operation is driverless for all OS
X versions).
Optical Digital Inputs - D1 and D2
The optical input connectors (D1 and D2) are
commonly known as TOSLINK connectors.
The TOSLINK optical connectors used on the
DAC3 are designed to work well at sample
rates up to 96 kHz. Maximum word length is
24-bits. All sample rates between 28 and 96
kHz are supported. The optical inputs may be
unreliable at sample rates above 96 kHz. The
optical inputs will accept professional
AES/EBU data formats or consumer S/PDIF
data formats.
Tip: The optical inputs include dust caps.
Keep these in place if the input is not being
used.
Coaxial Digital Inputs - D3 and D4
The coaxial digital inputs (D3 and D4) use
female RCA connectors. The input impedance
is 75 Ohms. Maximum word length is 24-bits.
All sample rates between 28 and 195 kHz are
supported. The coaxial digital inputs will
accept professional AES/EBU data formats or
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