Manual

1.13
Operation Manual
© 2016 Prism Media Products Ltd
Revision 1.01Prism Sound Callia
well as conventional DSD streams at multiples of 44.1kHz. These are indicated by the '48k' LED in
combination with the 'DSD' (and possibly 'x2') LEDs.
Line volume control
The line volume control allows Callia to drive a power amplifier directly, without the need for an
external volume control. The halo of LEDs around the knob shows the volume setting. Note that the
line volume control can be disabled, as described in the DIP switch functions section, in case an
external volume control is to be used.
Note that in this mode, the analogue line outputs are always driven at full volume, so care
must be taken to ensure that damage does not occur to equipment or listeners.
Headphone jack and volume control
Callia contains a high-quality low-impedance headphone amplifier with a dedicated volume control
independent of the line volume control. By default, the detection of a plug in the headphone jack
causes the analogue line outputs to be muted. For details of how to optimise the headphone
amplifier's output for different headphone impedances, as well as how to defeat this muting of the
analogue line outputs, see the DIP switch functions section.
TO PREVENT POSSIBLE HEARING DAMAGE, DO NOT LISTEN AT HIGH VOLUME
LEVELS FOR LONG PERIODS.
Standby mode
Holding in the standby/source button for one second causes Callia to enter standby mode. In this
mode, the conversion and analogue functions are turned off to save power, although the USB
functionality is retained, so the unit remains visible to a host computer. Normal operation is resumed
by pressing the standby/source button. Standby mode is indicated by the lighting of the LED in the
standby/source button.
Front panel LED brightness
The brightness of the front panel LEDs can be adjusted by turning the line volume control whilst
holding in the standby/source button. Turn the control clockwise to increase the brightness and
anticlockwise to decrease.
Retention of control settings
The line output volume, auto/manual source selection mode and LED brightness are remembered
when the unit is in standby or unpowered. However, note that recent changes may be forgotten if
power is removed from the unit without going into standby mode first.