Aphex 141 User Manual
I N T E R FACES
M O D E L 1 4 1 / 1 4 2 / 1 4 4
O W N E R ’ S G U I D E
Model 141 ADAT to Analog Converter
INSTRUCTION-ANUAL
A MESSAGE FROM THE PRESIDENT
Safety Declarations
This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to
The user is cautioned that changes and modifications made to the equipment without approval of the manufacturer could
Model 142 Analog to ADAT Converter
Model 144 AES/ADAT Bi-directional Converter
1.0 Introduction
The Aphex Models 141, 142 and 144 were developed as interfaces between the Aphex Anaconda
digital snake system and other devices. Each model was designed to do its job without any extra
unnecessary bells or whistles. While they each fulll that design specication, each model is an
excellent, useful product in it own right.
Since the I/O of the Anaconda is ADAT, there is an ADAT connection in each model. The ADAT eight
channel format has been a standard in the audio industry for years. It is a reliable, mature, cost
effective technology albeit with limitations. The prime limitation is the distance that ADAT audio can
be safely transmitted through ‘Lightpipe’ ber. Some claim that it could be as far as 30 feet, but our
experience shows that there can be signicant audible artifacts at 20 feet. We strongly recommend
that the distance be as short as possible, preferably less than 10 feet (3 meters).
The other limitation is that its maximum sample rate is 48kHz for eight channel operation. There is
a technology called S-Mux that doubles the maximum frequency but halves the channel count. We
have elected to stay with the sample rate of 48kHz in the Model 142, but Models 141 and 144 can
work at 44.1 or 48kHz.
There are many other products on the market that do similar functions. But none as simply or as
well or as cost effectively, as these units. You will enjoy many years of excellent uninterrupted
performance.
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Model 141 ADAT to Analog Converter
Model 142 Analog to ADAT Converter
Model 144 AES/ADAT Bi-directional Converter
2.0 Installation and Interfacing
Rack Installation
All three models are 1.75” high (1RU), 8.25” wide and 7.25” deep. They can be rack mounted by
using the Aphex accessory # 44-008SA rack kit. One kit can be used to mount a pair of units or a
single unit in 1RU. Follow the instructions included with the rack kit for assembly.
Make sure that there is sufcient airow around the units. Do not mount them directly on top of
equipment that generates excessive heat or near equipment that generates large magnetic hum
elds.
AC connections
All the models have internal power supplies that are preset to a specic operating voltage. Make sure
that the unit is set to the proper voltage for your area before connecting to AC power.
Audio connections
Analog audio connections in the Models 141 and 142 are through TASCAM analog standard 25 pin
D-Sub. Both input on the Model 142 and output on the Model 141 are female D-Sub connectors on
the chassis. D-Sub connections are as follows:
Balanced inputs
The analog audio input stages in the Model 142 are balanced. They can be driven by either a
balanced or an unbalanced input. If unbalanced, connect the “Hot” to the “+” pin on the input
connector. Connect ground to the “G” pin and “ - “ pin. Maximum input level, balanced or unbalanced
is +24dBu.
Balanced outputs
The analog audio outputs of the Model 141 are impedance balanced. This is a true balanced circuit,
however audio signals appear only on the “+” connector pins. If driving a balanced input connect the
output pins “+” and “-” to the appropriate input connections. It is recommended that the ground be
connected only at the receiving end. If driving an unbalanced input connect “+” to the “hot” input and
connect “G” to the ground connection at the receiving end. You can leave the “-” unconnected or it
can be tied to ground. Maximum output level is +24dBu.
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