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Prism Sound Callia - High-Resolution AD-DA Converter with USB

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Designed and manufactured exclusively in the United Kingdom, the Prism Sound CALLIA USB Digital to Analogue Converter (DAC) and digital audio preamplifier is tailored for listening to music. Features: Plug, play and enjoy your music in all popular formats No-compromise, full Prism Sound ... Read More

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Designed and manufactured exclusively in the United Kingdom, the Prism Sound CALLIA USB Digital to Analogue Converter (DAC) and digital audio preamplifier is tailored for listening to music.


  • Plug, play and enjoy your music in all popular formats
  • No-compromise, full Prism Sound audio quality
  • Play in Windows**, OSX, Linux, iOS and Android ***
  • Class compliant UAC2/USB for best compatibility
  • ASIO drivers for Windows
  • Windows WDM drivers (Vista and later)
  • Play from disc transport/player device via S/P-DIF
  • Optical and co-axial S/P-DIF inputs
  • Playback sampling rates from 44.1kHz to 384kHz ****
  • DSD64/128 via DOP (S/P-DIF DSD64 only)*****
  • Automated source selection, with manual override
  • Balanced +14dBu XLR and 2V RCA phono outputs
  • Low-Z headphone output (adjustable sensitivity)
  • Front-panel digital master volume control
  • State-of-the-art clocking with hybrid 2-stage DPLL
  • Fully-floating balanced architecture for low noise

* For mobile devices separate adaptors may be required.
** Requires supplied UAC2 drivers from Prism Sound.
*** Check your operating system version for UAC2 support.
**** NOTE: sampling rates > 192K down converted by 2x.

CALLIA is simply the best way to experience digital music. Coupled with high quality analogue power amplification and loudspeakers, CALLIA will deliver your music exactly as the recording producer intended. Whether it is early music, symphonic, choral, easy listening, elevator music, jazz, pop, hip-hop, EDM, garage, hard rock or something else, the clarity and neutrality of CALLIA will amaze you with its flexibility in the face of such different genres.

Using the acclaimed Prism Sound signal path, clock circuitry, ARM Cortex processor & USB platform of the Prism Sound professional range, CALLIA supports USB and S/P-DIF players.

No-compromise, full Prism Sound audio quality
The design goal for CALLIA was to provide Prism Sound audio quality in a sophisticated but easy to use package for listening to music at home. CALLIA makes no compromises on audio quality. CALLIA delivers the standard of audio performance demanded by top recording professionals at sampling rates from 44.1kHz to 384kHz**** or in DSD64 or DSD128.

CALLIA has the same no-compromise analogue circuitry as its professional cousins, with the same fully-balanced-throughout architecture and the same isolation barriers protecting the analogue from digital and computer interference.

CALLIA draws on Prism Sound's years of experience in developing digital audio products, including its range of audio measurement equipment, adopted by a wide variety of clients across the audio industry from pro-audio to consumer electronics. This experience means that CALLIA is well-behaved both as a computer peripheral and an audio processor.

Reliability is vitally important in professional recording. Prism Sound has always made extensive use of precise software calibration techniques in its converters - pots and tweaks are always unreliable, so there are none.

The design team has gone to great lengths to minimise noise and interference, in particular hum. All of the analogue circuits have galvanic isolation, while the unit's electronically balanced I/O allows it to handle common mode interference sources as well as enabling trouble-free connection to unbalanced equipment.

It is often said that THD+N figures do not always correlate well with the perception of sound quality and this is true - partly because the traditional measures of THD+N or SINAD expressed as RMS figures are rather a broad measure. With this in mind, we have taken great care to make sure that not only is the RMS THD+N figure very good, but the CALLIA noise and distortion spectrum is beyond reproach and that CALLIA provides the most transparent listening experience.

New high-current, low-impedance headphone output
The CALLIA headphone output is a brand new design, different from that of the professional audio range. The CALLIA headphone output is a high-current, low impedance design optimized for the best possible performance. CALLIA handles 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, well-balanced and transparent sound.

Easy connectivity to your computer, tablet* or transport
In CALLIA, we have created a unit compatible with the widest range of computer hardware using a USB2 interface supporting UAC2 audio. CALLIA also supports S/P-DIF digital audio inputs.

The UAC2 (USB Audio Class 2) interface is supported natively in Mac OS, Linux and Android, and in Windows with WDM and ASIO drivers that we supply.

CALLIA supports S/P-DIF digital audio inputs on both optical TOSLink and "Phono" co-axial screened copper connections. Source selection, namely USB or S/P-DIF on optical or copper connections is automatic, though manual override is possible.

Audio formats
CALLIA supports linear PCM in 2's complement binary coding and, using the "DSD over PCM" (DOP) protocol, DSD at the original bit-rate (DSD64) and also at 2 x the original rate (DSD128). DSD Files encoded as "DOP" may be played with both ASIO and WDM drivers.

Your computer, tablet or transport will commonly decode formats such as mp3 to PCM prior to transmission to the sound card, so these formats will typically be supported on your device in the same manner as they would be with another sound card.

On the S/P-DIF inputs, DOP can also be used, but only at the original DSD bit rate (DSD64) as these connections do not have enough bandwidth for DSD128.

The ASIO native DSD format is not currently supported.

Balanced and unbalanced outputs
CALLIA offers balanced and unbalanced output formats at +14dBu and 2Vrms respectively. The balanced output is presented on professional XLR male pin connectors and the unbalanced (consumer) output is on industry-standard "Phono" co-axial connectors.

Unsurpassed Jitter Rejection
CALLIA uses the same "CleverClox" hybrid digital phase-locked loop (DPLL) circuitry as Prism Sound professional products. Prism Sound digital audio products re-generate ultra-stable clocks for best quality conversion.

In the 1990s following initial work by Prism Sound principals Ian Dennis and Graham Boswell, Prism Sound went on to pioneer investigation of the effects of timing jitter on analogue to digital (A/D) and digital to analogue (D/A) conversion. The company produced numerous technical papers many of which are now regarded as standard reading by todays audio engineering professionals. The company developed special test stimuli such as the "JTEST" signal for S/P-DIF and AES3 interconnections and also developed special measurement capabilities in its range of audio test & measurement equipment.

Over the years, Prism Sound's reputation for audio quality has been matched by its reputation for after-sales support and technical advice. CALLIA has the benefit of that support and customers have access to one of the best technical teams in the business.

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Product Specs

Front Panel  
Input selection LEDs Indicate auto/manual select mode and current input: optical S/PDIF, RCA S/PDIF or USB.
Sample rate/format LEDs Indicate sample rate: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz,
(for fs>192k see note at foot of page),
DSD64 or DSD128
also indicates PCM word-length '> 16 bits' (24b LED ON blue)
or '> 24 bits' (24b LED ON pink).
Line volume control Controls the volume at the analog line outputs when enabled.
(See 'REAR PANEL -> DIP switches')
Halo setting indication.
Headphone output 6.3mm stereo jack socket, with illuminated volume control
Standby/source button Switches between operation and standby modes; also used for manual input selection (momentary press) and LED brigtness.
LED brightness Hold Standby/source button down and twist Volume knob to adjust.
Rear Panel  
Analog line outputs Two XLR male for balanced connection; two RCA sockets for unbalanced connection
S/PDIF inputs RCA coaxial and TOSLINK optical formats
DIP switches Enable/disable line volume control, DSD headroom select, headphone impedance setting
USB port USB 2.0 B type device socket
Mains power 3-pin 6A IEC inlet
Software Support  
Mac OS Support OS X 10.5 or later, Intel platform
Windows OS Support Windows Vista, 7, 8.x, 10 or later, 32 or 64 bit
Mac OS X audio driver Callia is a Core Audio compliant device
Windows audio driver ASIO and WDM device drivers supplied
Analog Line Outputs  
Configuration Fully-balanced analog signal path to electronically-balanced XLRs,
RCAs pseudo-balanced
Output amplitude XLR: 0dBFS=14dBu; RCA: 0dBFS=2Vrms
Output impedance 50Ω (both balanced and unbalanced outputs)
Unbalanced mode Automatic, with bootstrapping level compensation
Total harmonic distortion -107dB (0.00045%, -0.1dBFS)
THD+N -106dB (0.00050%, -0.1dBFS)
Dynamic range 115dB (-60dBFS)
Gain accuracy ±0.05dB
LF roll-off -0.05dB at 8Hz, -3dB at <1Hz
HF roll-off fs = 44.1kHz: -0.05dB at 21.4kHz; -3dB at 22.0kHz
fs = 48kHz: -0.05dB at 23.2kHz; -3dB at 23.9kHz
fs = 96kHz: -0.05dB at 32.0kHz; -3dB at 47.8kHz
fs >= 192kHz, incl. DSD64/128: -0.05dB at 32.0kHz; -3dB at 76kHz
Output balance >50dB
Inter-channel cross-talk 1kHz: <-135dB; 20Hz..20kHz: <-120dB
Inter-channel phase 10Hz..5kHz: ±0.4°,
5kHz..20kHz: ±0.25°,
20kHz..50kHz: ±0.5°,
Headphone Output  
Output amplitude 0dBFS=18.0dBu (HiZ), 14.45dBu (MedZ), 8.45dBu (LoZ)
measured at top (maximum setting) of potentiometer
Output impedance 4R
Total harmonic distortion -104dB (0.00045%, -0.1dBFS)
THD+n -103dB (0.00050%, -0.1dBFS)
Dynamic range 113dB (-60dBFS)
Gain accuracy ±0.05dB at top of potentiometer
LF roll-off -0.05dB at 6Hz; -3dB at 1.45Hz
HF roll-off fs=44.1kHz: -0.05dB at 20.3kHz; -3dB at 22.0kHz
fs=48kHz: -0.05dB at 21.1kHz; -3dB at 23.9kHz
fs=96kHz: -0.05dB at 27.0kHz, -3dB at 47.8kHz
fs=>=192kHz, including DSD64, DSD128:
-0.05dB at 27.0kHz, -3dB at 71.0kHz
Inter-channel cross-talk 1kHz: <-120dB; 20Hz..20kHz: <-105dB
Inter-channel phase 10Hz..5kHz: ±0.1º, 5kHz..20kHz: ±0.25º, 20kHz..50kHz: ±0.5º
USB Inputs  
Interface protocol USB Audio Device Class 2.0 (UAC2)
Audio formats supported PCM audio of up to 32 bit word length at sampling rates of
44k1, 48k, 88k2, 96k, 176k4, 192k, 352k8, 384k and
DSD64, DSD128 in DoP frame 
(for fs>192k see note at foot of page).
S/PDIF Inputs  
Interface formats S/PDIF (RCA and TOSLINK); RCA also accepts AES3-ID
Audio formats PCM audio of up to 24 bit word length at sampling rates of
44k1, 48k, 88k2, 96k, 176k4, 192k and
DSD64 in DoP frame
Channel Status ignored
Clock recovery technology Prism Sound CleverClox hybrid PLL
Synchronization sources: Local or S/PDIF input (automatic selection)
Local clock accuracy ±50ppm
Jitter rejection >60dB / decade above 100Hz
Dimensions Table-top (including feet): 285 x 242 x 50mm
Weight 2.1kg
Mains voltage 90VAC - 250VAC, 50 - 60Hz
Power consumption 15W
Fuse rating 0.5A(T), 20mm, glass
Operation ambient conditions 0 to 35°C, 85% maximum relative humidity
Supplied Accessories  
Prism Sound USB Memory Stick With firmware loader software & Windows drivers
IEC mains lead x 1
USB lead (type A to B) x 1

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