The Prism Sound CALLIA is a
high-resolution stereo USB DAC offering versatile sample rate and
headphone compatibility for audiophiles and music enthusiasts in home
stereos, listening rooms, and entertainment systems. It supports PCM
resolutions up to 32-bit / 384 kHz and DSD sample rates up to 12.288 MHz
via the stable, low-jitter CleverClox clock circuitry. Automatic source
selection with manual override allows for easy signal flow for the
inputs, which include USB 2.0 Type-B, TOSLINK optical S/PDIF, and
The stereo XLR and RCA outputs accommodate
proper connectivity with balanced and unbalanced equipment such as
speakers, power amps, stereo receivers, or monitor controllers.
Additionally, a front-panel 1/4" TRS jack provides a high-current,
low-impedance, headphone output that has three selectable operating
ranges. Separate illuminated volume controls for the headphone and line
outputs enable independent levels for monitors and headphones.
CALLIA is compatible with Mac OS X, Windows, Linux, iOS, and Android,
and ships with one USB cable, an IEC power cable, and a preloaded USB
Prism Sound uses precise software calibration techniques in
its converters to avoid the unreliability of pots and tweaks. Minimizing
noise, interference, and hum was a priority in the design. All the
analog circuits have galvanic isolation, while the unit's electronically
balanced I/O allows it to handle common mode interference sources and
trouble-free connection to unbalanced equipment.
Low-Impedance Headphone Output
The CALLIA headphone output utilizes a design different from
that of the Prism Sound professional audio range. The CALLIA headphone
output is a high-current, low-impedance design to handle the wide range
of headphone sensitivities and impedances by providing several operating
ranges, selected by switch presets on the rear panel of the unit. In
this way, CALLIA can easily handle headphones from a few Ohms to more
than 250 Ohms and will deliver a smooth, balanced, and transparent
By incorporating a UAC2-compliant USB 2.0 interface, the
CALLIA is supported natively in Mac OS X, Linux, and Android, and in
Windows with the supplied WDM and ASIO drivers. It also supports S/PDIF
digital audio inputs via TOSLINK optical or coaxial copper jacks. Source
selection is automatic, though manual override is possible.
Balanced and Unbalanced Outputs
The CALLIA offers balanced and unbalanced output formats at
14 dBu and 2 Vrms respectively. The balanced output is presented on XLR
3-pin male connectors, while the unbalanced output is on RCA coaxial
Multiple Audio Formats
Support is provided for linear PCM and DSD formats. Using
DSD over PCM (DOP) protocol, the CALLIA accommodates DSD at the original
rate (DSD64) and at two times the original rate (DSD128). DSD files
encoded as DOP may be played with both ASIO and WDM drivers.
The CALLIA uses the same CleverClox hybrid digital
phase-locked loop (DPLL) circuitry as the Prism Sound professional line.
The CleverClox regenerates clock signal for optimum stability.