Manual

1.14
Operation Manual
© 2016 Prism Media Products Ltd
Revision 1.01Prism Sound Callia
4.2 Rear panel
Callia's rear panel contains all of the input and output connections, except for the headphone jack
which is on the front panel.
From left to right (viewed from rear):
· 6A IEC inlet (regional power cord supplied): adjacent is the mains fuse holder.
· USB 2.0 device port for connection to a host computer (cable supplied).
· DIP switches: to customise some aspects of Callia's operation. See the DIP switch functions
section below.
· RCA S/PDIF input: can accept PCM streams up to 192kHz sample rate with up to 24 bit
wordlength, or DSD64 streams in DoP format. See the Inputs and outputs section below.
· Optical (TOSLINK) S/PDIF input: can accept PCM streams up to 192kHz sample rate with up to 24
bit wordlength, or DSD64 streams in DoP format. See the Inputs and outputs section below.
· XLR analogue line outputs: aligned for 0dBFS = +14dBu (3.88Vrms). See the Inputs and outputs
section below.
· RCA analogue line outputs: aligned for 0dBFS = 2.0Vrms (+8.24dBu). See the Inputs and outputs
section below.
4.2.1 DIP switch functions
A bank of four DIP switches are accessible on Callia's rear panel which can be used to customise
operation of the the unit. From left to right, the functions of the switches are:
DIP switch 1 determines whether the line volume control is enabled:
When ON (default): Line volume control is enabled;
When OFF: Line volume control is defeated, for use with downstream volume control - CAUTION:
in this position the analogue line outputs are driven at full volume!
DIP switch 2 sets the DSD headroom:
When ON (default): DSD headroom is +3.1 dB SA-CD so 'hot' DSD streams (permitted by Annex D of
Scarlet Book 1.3 after March 2003) can be accommodated without clipping;
When OFF: DSD headroom is 0 dB SA-CD, so excessive DSD transients may be clipped, but noise
floor is 3.1dB lower.