• Prism Sound Callia


Prism Sound Callia USB Audiophile DAC and Preamplifier : 

Ex.demo unit, perfect shape, with box and warranty.




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

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. 

Also amazing with headphones... visit us for a listening session!

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.


  • 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

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. 

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.

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. 

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.


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. 


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.


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


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


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°,


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


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).


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


Prism Sound USB Memory Stick With firmware loader software & Windows drivers
IEC mains lead x 1
USB lead (type A to B) x 1



Prism Sound

Callia DAC and Preamplifier

€1,299.00 EUR €2,195.00 EUR




Personal Advice

Auditorium / Physical Shop

Customer Support

Search our store