Aphex Channel Instruction Manual download pdf (Page 9)

230

instruction Manual

Aphex Systems Ltd. Model 230Page 8

230

master voice channel

Page 9Aphex Systems Ltd. Model 230

Installation & Interfacing

3.6 OUTPUT CONNECTORS

There are two output connectors located on the

rear panel: one 1/4” TRS phone type and one XLR-

3M type. They can be used at the same time to feed

separate equipment.

The output level at the XLR is +4dBu impedance

balanced, while the phone jack runs unbalanced at

-10dBV (consumer level).

If you intend to make an unbalanced output from

the XLR jack, simply take “hot” from pin 2 and

use pin 1 for ground. Leave pin 3 unconnected or

grounded. Never ground pin 2.

Refer to Appendix C & D for more information on the

proper wiring of balanced and unbalanced lines.

3.7 DIGITAL AUDIO OUTPUTS

The processed mic signal is converted to digital in

both channels at equal level as a mono signal. There

is no provision to externally drive one of the A/D Con-

verter inputs.

3.8 WORD CLOCK

3.8.1 INT/EXT

Synchronization is selected by the INT/EXT switch

on the back panel. With external clock, the 230 will

sync to frequencies between 32kHz to 96kHz. With

internal clock, you get the four frequency selections

of 44.1, 48, 88.2 or 96kHz.

3.8.2 WC IN

This BNC jack is provided to receive your master clock

source. It will accept industry standard Word Clock,

from less than 1 to over 5Vp-p pulse amplitude. It

does not accept AES/EBU or Superclock.

The Model 230 can operate equally well from a

typical “brute force” 5V word clock output or from

a matched impedance master clocking distribution.

Please refer to the appendix for a thorough discus-

sion of clock wiring and distribution systems.

When the Model 230 is operating in external clock

mode, the WC IN jack is tied directly to the WC OUT

jack through a metal relay contact. The input imped-

ance is high enough to daisy-chain up to four units

by looping straight through. The final daisy-chained

unit should have a 75 ohm BNC terminator plug

inserted in its WC OUT jack to properly terminate the

transmission line. If only one unit is connected, then

simply place the terminator plug on the single unit’s

XLR:

AES/EBU 110Ω @ 5Vp-p

RCA:

S/PDIF 75Ω @ 1Vp-p

OPTICAL: Toslink S/PDIF encoded for optical fiber.

DIGITAL OUTPUT DEFINITIONS

Figure 3-1 Daisy Chaining Alternatives for External Master Clock

Clock Source

Tee

Terminator

230 #1 230 #2 230 #3 230 #4

In Out In Out In Out In

Out

Clock Source

Terminator

230 #1 230 #2 230 #3 230 #4

Out In Out In Out In Out

Universal Technique

Ok For Closely Co-located 230’s

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 31 32

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