CALLIA Tech Specs

Input selection LEDsIndicate auto/manual select mode and current input: optical S/PDIF, RCA S/PDIF or USB.
Sample rate/format LEDsIndicate 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 controlControls the volume at the analog line outputs when enabled.
(See ‘REAR PANEL -> DIP switches’)
Halo setting indication.
Headphone output6.3mm stereo jack socket, with illuminated volume control
Standby/source buttonSwitches between operation and standby modes; also used for manual input selection (momentary press) and LED brigtness.
LED brightnessHold Standby/source button down and twist Volume knob to adjust.
Analog line outputsTwo XLR male for balanced connection; two RCA sockets for unbalanced connection
S/PDIF inputsRCA coaxial and TOSLINK optical formats
DIP switchesEnable/disable line volume control, DSD headroom select, headphone impedance setting
USB portUSB 2.0 B type device socket
Mains power3-pin 6A IEC inlet
Mac OS Support OS X 10.5 or later on Intel and Apple M1 silicon
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
ConfigurationFully-balanced analog signal path to electronically-balanced XLRs,
RCAs pseudo-balanced
Output amplitudeXLR: 0dBFS=14dBu; RCA: 0dBFS=2Vrms
Output impedance50Ω (both balanced and unbalanced outputs)
Unbalanced modeAutomatic, with bootstrapping level compensation
Total harmonic distortion-107dB (0.00045%, -0.1dBFS)
THD+N-106dB (0.00050%, -0.1dBFS)
Dynamic range115dB (-60dBFS)
Gain accuracy±0.05dB
LF roll-off-0.05dB at 8Hz, -3dB at <1Hz
HF roll-offfs = 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-talk1kHz: <-135dB; 20Hz..20kHz: <-120dB
Inter-channel phase10Hz..5kHz: ±0.4°,
5kHz..20kHz: ±0.25°,
20kHz..50kHz: ±0.5°,

Output amplitude0dBFS=18.0dBu (HiZ), 14.45dBu (MedZ), 8.45dBu (LoZ)
measured at top (maximum setting) of potentiometer
Output impedance4R
Total harmonic distortion-104dB (0.00045%, -0.1dBFS)
THD+n-103dB (0.00050%, -0.1dBFS)
Dynamic range113dB (-60dBFS)
Gain accuracy±0.05dB at top of potentiometer
LF roll-off-0.05dB at 6Hz; -3dB at 1.45Hz
HF roll-offfs=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-talk1kHz: <-120dB; 20Hz..20kHz: <-105dB
Inter-channel phase10Hz..5kHz: ±0.1º, 5kHz..20kHz: ±0.25º, 20kHz..50kHz: ±0.5º
Interface protocolUSB Audio Device Class 2.0 (UAC2)
Audio formats supportedPCM 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 formatsS/PDIF (RCA and TOSLINK); RCA also accepts AES3-ID
Audio formatsPCM audio of up to 24 bit word length at sampling rates of
44k1, 48k, 88k2, 96k, 176k4, 192k and
DSD64 in DoP frame
Channel Statusignored
Clock recovery technologyPrism Sound CleverClox hybrid PLL
Synchronization sources:Local or S/PDIF input (automatic selection)
Local clock accuracy±50ppm
Jitter rejection>60dB / decade above 100Hz
USB Stick with software and manuals x 1
IEC mains lead x 1
USB Lead type A to B x 1

Notes about DSD headroom and bit rates

In the SACD specification there was at one point an amendment to exactly what constituted the maximum permissible DSD signal level. Early SACDs were prepared with a maximum peak signal level of 0dB SACD, whereas a later annex permitted maximum peak levels up to 3.1 dB SACD.

So in designing a DSD DAC, we need to accommodate the higher level without clipping, but that means that for DSD recorded in observance of the lower maximum level we are needlessly squandering 3dB of our hard-won dynamic range. So we have provided a setting to allow you to choose how best to deploy the DAC’s available dynamic range.

In addition to the DSD64 (5.6448 Mbit/s) and DSD128 (11.2896 Mbit/s) bit rates, Callia also supports the 48kHz-derived rates of 6.144 Mbit/s and 12.288 Mbit/s. At 6.144Mbit/s in addition to the DSD LED, the 48k LED will be lit and at 12.288 Mbit/s the DSD, 48k and x2 LEDs will be lit.

Measurement conditions

Except where otherwise stated, audio performance data are RMS, unweighted, 20Hz..20kHz figures, measured at 997Hz, using fs = 96kHz and ‘+4dBu’ sensitivity settings.


A note about higher sampling rates >192kHz

From its USB interface, CALLIA can play audio at sampling rates greater than 192kHz. At these higher rates a proprietary, high performance decimation filter is used to reduce the sampling rate by a factor of 2. For example, 384kHz will be converted down to 192kHz.

In keeping with our policy of continual development, specifications are subject to amendment without notice. E&OE.

All Trade Marks Acknowledged.