ALESIS QSR 64 - Manual (Page 25)

Connections: Chapter 3
QSR Reference Manual
D
IGITAL
A
UDIO
/O
PTICAL
H
OOKUP
The QSR can output digital audio directly into an Alesis ADAT or ADAT-compatible
multitrack digital recorder via fiber optic cable.
The digital connector follows a proprietary Alesis format that carries all four audio
outputs of the QSR (Main and Aux, Left and Right) on a single fiber optic cable.
Either pair of outputs can be converted into standard AES/EBU or S/PDIF stereo
digital audio format by using the Alesis AI-1 interface. Fiber optic cables of various
lengths are available from your Alesis dealer. However, the shorter the cable, the
better. The model OC cable is 5 meters long and is the maximum length
recommended.
To hook up the optical cable between the QSR and an ADAT or AI-1:
➀
Remove the two pieces of clear plastic, tubular sleeving (if present) that protect
the tips of the optical cable plug.
➁
Insert one cable end into the QSR [DIGITAL OUT] and the other end into the
ADAT or AI-1 DIGITAL IN.
To test the cable and QSR digital output, plug one cable end into the QSR. The other
end should emit a soft red light (it is not dangerous to look directly at this light).
R ECORDING D IGITAL A UDIO
Once the fiber optic connection is made between the QSR and ADAT or an AI-1, the
QSR will output audio on the first four channels of the digital bus (the bus is capable
of handling eight channels of digital audio). The MAIN [L] and [R] outputs are routed
to channels 1 and 2, while the AUX [L] and [R] outputs are routed to channels 3 and
4. Note that the [VOLUME] knob controls the level of all analog output channels
only, and does not control digital output levels. If your digital output is overloading,
try reducing the sound level in Program Edit Mode or the Program volume in Mix
Edit Mode.
When recording to ADAT (or some other digital audio recorder), it will be slaving to
the digital clock accompanying the digital audio emanating from the QSR. This clock
can be set to either 48kHz or 44.1kHz, as determined by the Clock function (found in
Global Edit Mode). The Clock function has four settings: Int48kHz, Int44.1k,
Ext48kHz and Ext44.1k. The default setting is Int48kHz. which is suitable
when the digital recorder is using the 48kHz sample rate. However, if the recorder is
using the 44.1kHz sample rate, the Clock function should be set to Int44.1k. This
ensures that the QSR will be in tune with previously recorded material. See page 118
in Chapter 8 for more information on the Clock parameter.