Alesis S4 Plus Bedienungsanleitung PDF herunterladen (Seite 23)

Chapter 3: Connections

22 S4 Plus Reference Manual

Digital Audio/Optical Hookup

The S4 Plus can send digital audio directly into ADAT, which provides better fidelity

than using the analog inputs and outputs.

The digital I/O connector follows a proprietary Alesis format that carries all four audio

outputs 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.

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:

¿ Remove the two pieces of clear plastic, tubular sleeving (if present) that protect

the tips of the optical cable plugs.

¡ Insert one cable end into the S4 Plus DIGITAL OUT and the other end into the

ADAT or AI-1 DIGITAL IN.

To test the cable and S4 Plus digital output, plug one cable end into the S4 Plus. The

other end should emit a soft red light (it is not dangerous to look directly at this light).

Recording Digital Audio

Once the fiber optic connection is made between the S4 Plus and ADAT or an AI-1,

the S4 Plus 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 Left and Right outputs

are routed to channels 1 and 2, while the Aux Left and Right outputs are routed to

channels 3 and 4. Note that the volume knob controls the level of all analog and

digital output channels simultaneously. Set the volume to maximum for most

applications.

48 kHz Clock In

If your ADAT system has an Alesis BRC Remote Controller, the S4 Plus’s digital

clock must be synchronized to the clock coming from the BRC. Connect a BNC-to-

BNC cable (such as the Alesis BN cable) between the BRC’s 48 kHz CLOCK OUT

and the S4 Plus’s 48 kHz CLOCK IN. For more information about using the 48 kHz

clock, see page 118 in Chapter 8. When using only one ADAT without the BRC, it is

not necessary to connect the 48 kHz Clock.

DIGITAL

OUT

48 KHZ

OUT

DIGITAL

SYNC

OUT

SYNC

BRC

ADAT #3

ADAT #1

ADAT #2

Tip:

With this type of connection, the ADAT tracks will remain in tune with the S4 Plus

even when the BRC’s pitch value is adjusted.

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