Studio Tools 80 M80-00360 Manual de usuario
Copyright © 1999 by Studio Technologies, Inc., all rights reserved
5520 West Touhy Avenue
Skokie, Illinois 60077 U.S.A.
Telephone (847) 676 9177
Fax (847) 982 0747
www.studio tech.com
Model 80 Stereo nalog
udio Distribution mplifier
User Guide
Issue 5, October 1999
This User Guide is applicable for serial numbers:
Model 80 M80 00360 and later
50200 1099, Issue 5
Model 80 User Guide Issue 5, October 1999
Studio Technologies, Inc. Page
Table of Contents
Foreword...................................................................... 5
Introduction .................................................................. 7
What This User Guide Covers ................................. 7
System Overview ..................................................... 7
System Features ...................................................... 7
Installation .................................................................... 9
Configuration ............................................................... 11
Operation ..................................................................... 12
Troubleshooting ........................................................... 12
Technical Notes ........................................................... 14
Specifications............................................................... 16
Block Diagram
Issue 5, October 1999 Model 80 User Guide
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Model 80 User Guide Issue 5, October 1999
Studio Technologies, Inc. Page 5
Foreword
I am pleased to present the Model 80 Stereo Analog Audio Distribution Ampli
fier. As both president and owner of Studio Technologies, I take a very personal
approach when designing products. Getting older (38 as of this writing) has
increased my appreciation of the more subtle things in lifebe they a part of
nature or the nuances contained in a well designed piece of electronic equip
ment. Do the technical and operational aspects of a product work together to
feel right? A Studio Technologies design is ready to go only when I am com
pletely satisfied.
Many fine people worked toward making the Model 80 happen. Mitch Budniak
(ace consulting engineer) designed many of the circuits. Jim Cunningham
contributed to the analog design. Carrie Loving provided engineering support.
Ben Kamen designed the automatic testing routines. Al Lux designed the
printed circuit board. Fred Roeck performed the mechanical design. Joe
Urbanczyk coordinated the safety testing and agency approvals.
Additional thanks to Timothy Powell of Metro Mobile Recording, Glenview,
Illinois, who provided his excellent ears when issues of sonic quality arose. His
extensive field and studio experience was extremely helpful in keeping me on
the audio straight and narrow.
Please contact me with your questions, comments, and suggestions. I can be
reached by voice at (847) 676 9177, fax at (847) 982 0747, or via the Internet @
www.studio tech.com.
Sincerely,
Gordon K. Kapes
President
Issue 5, October 1999 Model 80 User Guide
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Model 80 User Guide Issue 5, October 1999
Studio Technologies, Inc. Page 7
Introduction
The Model 80 Stereo Analog Audio
Distribution Amplifier was developed by
Studio Technologies as part of its Studio
Tools group of audio support products.
The Model 80 is designed to work in a
large variety of applications. Specific
applications include audio production,
duplication, broadcast, and sound rein
forcement. All Model 80 functions meet
or exceed the performance of the most
expensive high end audio equipment.
What This User Guide Covers
This User Guide is designed to assist you
when installing, configuring, and using the
Model 80 Stereo Analog Audio Distribution
Amplifier.
System Overview
The Model 80 from Studio Technologies,
Inc. is the first distribution amplifier that
meets the needs of the real world. The
stereo input is intended to connect to
virtually any line level audio source. The
ExactCal input calibration section allows
for optimal audio performance over a 10
to +10dBu input level range. The eight
stereo outputs meet exacting professional
standards. Capable of driving balanced or
unbalanced loads, each output can drive
+26dBu into 600 ohms. Using front panel
switches, each output can be individually
configured for a nominal output level of
10 or +4dBu.
The front panel controls and LEDs make
installation and setup a simple job. The
AC mains internal power is factory config
ured for 100, 120 or 220/240V, 50/60Hz
operation. Components and construction
standards make the Model 80 suitable
for continuous operation, even for on air
broadcast applications.
System Features
One Stereo Input
The differential input circuitry is compat
ible with balanced or unbalanced signals
having a nominal level range of 10 to
+10dBu. Using laser trimmed compo
nents, the input offers superior common
mode signal rejection. To achieve optimal
audio performance the ExactCal calibra
tion section matches the specific input
level with the Model 80s internal gain
structure. Two controls and four LEDs
allow fast, precise calibration. Unlike other
distribution amplifiers, the Model 80
ensures that excellent audio performance
can be achieved with little or no hassle.
In addition to separate left and right input
connectors, two input loop through con
nectors are also provided. This simple
feature can make installation with related
equipment much easier. The loop through
connectors allow the Model 80s input
source to be connected to another Model
80 or to yet another device.
Eight Stereo Outputs
The Model 80 contains eight independent
stereo output sections. For compatibility
with a range of facilities, each output
section can be separately configured for
10 or +4dBu nominal output level. Each
output features an electronically balanced
circuit capable of driving balanced or
unbalanced loads. Operating an output
in an unbalanced configuration does not
cause its nominal output level to change.
Short circuit resistant, the rugged output
circuits can drive full signal levels into 600
ohm or greater loads.
Issue 5, October 1999 Model 80 User Guide
Page 8 Studio Technologies, Inc.
Model 80 Back Panel
Model 80 Front Panel
Power
present LED
10 or +4 output level
configuration switches
AC mains
connection
Loop through
output
Stereo line level
input
Stereo line level
outputs
Input
level control
Input level
calibration LEDs
Right input
trim control
The Model 80s architecture precludes the
need for individual output level trim poten
tiometers. With the input signal calibrated
using the ExactCal section, the eight
stereo outputs use 1% tolerance compo
nents to provide precise 10 or +4dBu
outputs.
udio Performance
The Model 80 is the result of exacting
circuit design combined with the latest
state of the art components. Like all
Studio Technologies products, the Model
80 has survived tough listening evalua
tions by industry professionals. These
veterans had the ears to guide us in
achieving the right performance. The
outcome is a product that achieves
sonic excellence.
Design Philosophy
Most audio distribution amplifiers contain
a level trim adjustment on each output.
After careful study Studio Technologies
concluded that these adjustments con
fused, and often interfered with the pro
cess of getting maximum audio perform
ance. After checking with personnel in the
field, it became clear that what is desired
in virtually every distribution amplifier
applications are multiple audio outputs all
operating at a standard reference level.
By implementing the ExactCal system, the
Model 80s internal operating level can be
easily calibrated to match the input signal.
Once this input level matching is accom
plished the eight stereo outputs can be
individually configured for a 10 or +4dBu
nominal operating level. In conclusion,
output trim pots are not included on the
Model 80 for the simple reason that better
audio performance can be achieved
without them!
Model 80 User Guide Issue 5, October 1999
Studio Technologies, Inc. Page 9
Installation
In this section you will be installing the
Model 80 in an equipment rack. Audio
input and output connections will be made
using the Model 80s multitude of phone
jacks. AC mains power will be connected
to the Model 80.
System Components
The shipping carton contains a Model 80,
User Guide, and warranty card. Units
destined for North America are shipped
with an AC mains cord. Your dealer or
distributor will provide an AC mains cord
for non North American destinations.
Mounting the Model 80
The Model 80 requires one space in a
standard 19 inch (48.3cm) equipment
rack. It is desirable to locate the Model 80
to allow easy access to both the front and
the back panels. The back panel contains
the input and output connectors. The front
panel is used to access the calibration
controls and output level switches. The
front panel also contains several LED
indicators. The Model 80 is secured to
the equipment rack using two mounting
screws per side.
udio Inputs and Outputs
The Model 80s audio input and output
connections are made using ¼ inch
3 conductor phone jacks. The choice of
phone jacks was simply a matter of real
estate20 XLR connectors dont quite
fit on the back of a one rack space unit!
Dont be concerned about damage to
your audio quality, the jacks used in the
Model 80 are manufactured by Neutrik
of Switzerland and feature gold plated
contacts for excellent performance.
Balanced Connection
(Input & Output)
Sleeve
(Shield)
Ring ()
(Switchcraft No. 297, Neutrik NP3C, or equivalent)
Unbalanced Connection
(Input & Output)
Sleeve
(Shield)
Tip ( + )
(Switchcraft No. 280, Neutrik NP2C, or equivalent)
Tip ( + )
Caution: For reliable audio interconnec
tion, the plugs you use must comply with
industry standard RS 453. Switchcraft No.
297, Neutrik NP3C, or equivalent will work
correctly. Refer to the Technical Notes
section for details.
udio Input
The Model 80 provides one stereo line
level input. It is electronically balanced,
and is compatible with balanced or unbal
anced signals that have a nominal level
range of 10 to +10dBu. The ExactCal
section allows precise level calibration
with the connected input signal. It is
anticipated that in most cases a stereo
signal will be connected to the input. The
Model 80 can also be used as a 1 input/
16 output monaural distribution amplifier,
or as a dual 1 input/8 output monaural
distribution amplifier.
Issue 5, October 1999 Model 80 User Guide
Page 10 Studio Technologies, Inc.
Prepare the input plugs so that tip is
positive (+ or hot), ring is negative ( or
cold), and sleeve is shield. The input
jacks will also accept unbalanced ¼ inch
2 conductor phone plugs. With unbal
anced phone plugs, tip is positive (+ or
hot) and sleeve is shield. If 3 conductor
phone plugs are used to connect unbal
anced signals, connect positive (+ or hot)
to tip and connect shield to ring and
sleeve.
Loop-Through
The two loop through jacks are electrically
wired in parallel with the two input jacks.
With this arrangement several applications
are possible, such as allowing the input
signals to be routed to another stereo
input without the use of Y adapters. The
source signals would be connected to the
input jacks. The loop through jacks would
be used to connect the source signals to
the next piece of equipment using ¼ inch
3 conductor patch cords.
Another application would be where more
than one Model 80 is used to distribute the
same input signal. Two ¼ inch 3 conduc
tor patch cords would link the loop
through jacks on the first Model 80 to the
input jacks on the second Model 80.
Yet another application would be where
the Model 80 is used as a 1 input/16
output monaural distribution amplifier. The
monaural input would be connected to the
left input jack, and a ¼ inch 3 conductor
patch cord would connect the left loop
through jack to the right input jack.
udio Outputs
The Model 80 contains eight independent
stereo line level outputs which are in
tended for connection to a variety of ana
log audio devices. The outputs are
electronically balanced and capable of
driving balanced or unbalanced loads of
600 ohm or greater. The outputs can be
individually configured for a nominal
output level of 10 or +4dBu, so you
can connect to all line level inputs with
no hassle.
Prepare the output plugs so that tip is
positive (+ or hot), ring is negative ( or
cold), and sleeve is shield. The output
jacks will also accept unbalanced ¼ inch
2 conductor phone plugs. With unbal
anced phone plugs, tip is positive (+ or
hot) and sleeve is shield. If a 3 conductor
phone plug is used in an unbalanced
application, connect positive (+ or hot) to
tip and connect shield to ring and sleeve.
C Mains Power
The Model 80 is internally configured to
operate from either 100, 120, or 220/240V,
50/60Hz. In most cases, units shipped to
North America are factory selected for
120V operation. Units bound for Japan are
selected for 100V, while our friends down
under and in Europe receive units set for
220/240V. Before connecting the Model 80
to AC mains power, check that it is config
ured to match the local mains voltage.
Look on the back panel, adjacent to the
power entry connector, for the configured
voltage(s). Note that an incorrect configu
ration could seriously damage the unit.
Should it be necessary to change the
units operating voltage it must be
performed only at the factory or by
an authorized service technician.
The Model 80 uses an IEC standard con
nector to mate with the AC mains cord.
The wire colors in the AC mains cord
should conform to the internationally
recognized CEE color code and must
be wired accordingly:
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