Manual

1.16
Operation Manual
© 2016 Prism Media Products Ltd
Revision 1.01Prism Sound Callia
S/PDIF inputs
Callia can also be connected to both optical (TOSLINK) and RCA S/PDIF sources, and supports PCM
at standard sample rates between 44.1kHz and 192kHz, and wordlengths up to 24 bits. DSD,
formatted as DSD-over-PCM (DoP) is supported at a bit-rates of 2.8224MHz (DSD64), plus
48kHz-multiple DSD64. Note that professional AES3 and AES3-id digital carrier formats will also
work using an appropriate adapter at the RCA input.
In S/PDIF mode, Callia uses Prism Sound's acclaimed CleverClox hybrid PLL technology to lock its
clock to the selected S/PDIF source with ultra-low jitter.
Note that no software installation is required for users who only intend to use Callia with its S/PDIF
inputs (and not USB), although it will still be necessary to install the software (on either Mac or
Windows PC) in order to be able to update the unit's firmware (see Software and firmware updates).
Analogue line outputs
Callia provides stereo analogue line outputs in both balanced (XLR) and unbalanced (RCA) formats.
These are subject to the front-panel line volume control by default, but this can be disabled: see the
DIP switch functions section.
The balanced outputs are precisely level-aligned at 0dBFS = +14dBu (3.88Vrms) within +/-0.05dB.
They are transformerless, electronically bootstrapping, outputs which will maintain their correct output
level and behavior even if connected to unbalanced inputs of following equipment. Industry-standard
XLR pin-out is observed: 1 = signal-ground, 2 = hot (non-inverted), 3 = cold (inverted), so connection
using standard pre-wired XLR cables is recommended.
The unbalanced outputs are precisely level-aligned at 0dBFS = +8.24dBu (2.00Vrms) within
+/-0.05dB.
Both the balanced (XLR) and unbalanced (RCA) analogue line outputs may be used simultaneously if
required.
Headphone jack
Callia's 6.3mm front-panel headphone jack is driven from a professional quality headphone amplifier,
with low noise and distortion, and very low output impedance, giving unparalleled performance with
any type of headphones. It has a dedicated volume control. By default, plugging headphones into the
jack will mute the analogue line outputs, but this can be disabled: see the DIP switch functions
section.
The performance of the headphone amplifier and the range of its volume control can be optimised
according to the impedance of your headphones: this is also described in DIP switch functions
section.