T+A Cala D User Manual page 27

USB
DIGITAL INPUT
 R and  L
(loudspeaker terminals)
Socket for USB memory sticks, external hard discs or iPod.
The storage device must be formatted with a FAT16 or FAT32 file system.
The USB device (example 2,5 inch HDD) can be supplied with power from the
 via the USB socket: The maximum supply current provided by the USB
socket is 1000 mA.
If the power consumption of the connected USB device is higher than 1000 mA
it must be powered by an extra power supply.
Inputs for digital source devices with optical or co-ax digital output (SP-DIF).
Supported sample rates:
Up to 96 kHz at D3 and 192 kHz at D1, D2.

This input is equipped with an automatic power on function. Please refer
chapter 'System settings / source settings'.
One pair of loudspeakers can be connected to the  (SPEAKER  R and
SPEAKER  L). The impedance of each speaker must not be lower than 4 
(DIN rating).

Caution!
The load capacity of the loudspeakers connected to the device must be
appropriate to the amplifier. The speaker impedance must be at least 4
Ohm (DIN rating). Always connect your loudspeakers using ready-made,
purpose-designed speaker cables terminating in approved connectors.
The speaker cables and connectors must be insulated in accordance with
regulations, and the conductors must have a minimum cross-sectional
area of 1.5 mm².Make sure that the terminals are firmly screwed down,
and that no short-circuits are possible.

Note:
If the loudspeakers are to be used in countries outside the EU the red/black
stoppers can be removed from the loudspeaker terminals. The speakers can
then be connected using banana plugs.
The stoppers are simply a push-fit in the terminals, and can be prised out from
the rear using a suitable tool such as a knife blade
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