Aphex Systems 148 - Manual

148 Active Digital Audio Splitter
8 x 3 2
With the advent of digital audio
consoles and recording devices the
need often arises for a digital output to
be sent to multiple digital inputs. But
digital signals cannot be split as simply
as analog audio signals. Trouble-free
transmission of digital audio requires
strict adherence to standards for
input and output impedances as well
as wiring. If the standards are not
met the robustness of the system
can diminish causing noise, drop
outs or complete loss of signal. As
the sampling rate increases, so does
the possibility of failures. Changing
the input impedance by wiring two or
more inputs across one output simply
does not work.
There are many digital audio
distribution amplifiers on the market.
They can do many things such as
reclocking, reshaping, matrixing,
format conversion, etc. But when the
need is only for splitting, especially for
multiple channels, these other devices
are prohibitively expensive, bulky and
difficult to set up.
The Model 148 was developed
specifically for those applications in
which the requirement is to feed the
same digital audio signal to multiple
inputs. It is clean, stable and extremely
cost effective.
Through the use of 15-pin D sub
connectors the Vz rack unit can split
8 channels (4 pairs) of digital audio
into 32 channels (16 pair). The D-
Subs follow the standards used on
the Model 1788 remote controlled mic
preamplifier (see illustration above for
the wiring diagram).
The Model 148 can be mounted in a
rack singly or in pairs with the Aphex
Model 44-008SA rack kit.
The Model 148 incorporates 20dB of
saturated gain to square up the input
signal. In many cases it can be used
as a booster amplifier to restore a
signal to full drive at the end of longer
runs.
The Model 148 can also be internally
configured for either 110Q balanced or
75Q unbalanced operation.
Features
1 DB15 Input Connector
4 AES3 Stereo Inputs
4 DB15 Output Connectors
4 AES3 Stereo Outputs On Each
No Setup Required
Fully Automatic Signal Transfer
Accepts S/PDIF and Pro Input Levels
Sample Rates to 192kHz
All I/O Transformer Isolated
Low Jitter
Low Cost
1/2 Rack Package
Internal Power Supply
High Reliability
SPECIFICATIONS
Inputs; 4 Stereo Pro AES3 Transformer
Outputs:
Balanced, DB15 Male
4x4 Stereo Pro AES3 Transformer
AES3 Jitter:
Balanced, DB15 Female
Less than 100 picoseconds
Input Z: 11 on or 750 (Internal Switch)
Output Z: 11 on Balanced (Special Order 750
Output Level:
Unbalanced)
AES3 (with Standard Z=110O)
Transfer Gain:
S/PDIF (with Special Order Z=750)
Automatic - .5VP-P to 5VP-P Input
Power Supply;
Generates Specified Output
Internal, fused
Power Requirements: 100/120/240V- 50/60HZ - 5W
Size: 8.5 in. W X 1.75 in. H X 8 in. D
Net Weight; 2lbs.
C €
59887
Improving The Way The World Sounds
S Y S T E M S
Aphex Systems Ltd. • 11068 Randall St., Sun Valley, CA 91352. Tel; (818) 767-2929 Fax; (818) 767-2641 Email; sales(@aphex.com . Aphex
and Compellor are registered trademarks.
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3/16/2004, 12:11 PM