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KRAMER ELECTRONIC S LTD.
USER MANUAL
MODELS:
TR-91
100W Audio Transformer
TR-92
2x100W Audio Transformer
P/N: 2900-300384 Rev 4
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TR-91 / TR-92 - Contents
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Contents
1 Introduction 1
2 Getting Started 2
2.1 Achieving the Best Performance 2
2.2 Recycling Kramer Products 3
3 Overview 4
4 Defining the TR-91 and TR-92 5
5 Installing the TR-91 and TR-92 6
5.1 Connecting the TR-92 6
5.2 Connecting the TR-91 8
6 Technical Specifications 10
Figures
Figure 1: TR-91 100W Audio Transformer 5
Figure 2: TR-92 2x100W Audio Transformer 5
Figure 3: Connecting the TR-92 2x100W Audio Transformer 7
Figure 4: Connecting the TR-91 100W Audio Transformer 9
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TR-91 / TR-92 - Introduction
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Array installations
Presentation venues
Conference rooms
Training rooms
Educational classrooms
Hotel lobbies
1 Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been
providing a world of unique, creative, and affordable solutions to the vast range of
problems that confront video, audio, presentation, and broadcasting professionals
on a daily basis. In recent years, we have redesigned and upgraded most of our
line, making the best even better!
Our 1,000-plus different models now appear in 11 groups that are clearly defined
by function: GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Routers;
GROUP 3: Control Systems; GROUP 4: Format/Standards Converters; GROUP 5:
Range Extenders and Repeaters; GROUP 6: Specialty AV Products; GROUP 7:
Scan Converters and Scalers; GROUP 8: Cables and Connectors; GROUP 9:
Room Connectivity; GROUP 10: Accessories and Rack Adapters and GROUP 11:
Sierra Video Products.
Congratulations on purchasing your Kramer TR-91 100W Audio Transformer /
TR-92 2x100W Audio Transformer, which is ideal for the following typical
applications:
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TR-91 / TR-92 - Getting Started
Go to http://www.kramerelectronics.com/support/product_downloads.asp
to check for up-to-date user manuals, application programs, and to check
if firmware upgrades are available (where appropriate).
This equipment is to be used only inside a building. It may only be
connected to other equipment that is installed inside a building.
There are no operator serviceable parts inside the unit.
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2 Getting Started
We recommend that you:
Unpack the equipment carefully and save the original box and packaging
materials for possible future shipment
Review the contents of this user manual
2.1 Achieving the Best Performance
To achieve the best performance:
Use only good quality connection cables (we recommend Kramer high-
performance, high-resolution cables) to avoid interference, deterioration in
signal quality due to poor matching, and elevated noise levels (often
associated with low quality cables)
Do not secure the cables in tight bundles or roll the slack into tight coils
Avoid interference from neighboring electrical appliances that may adversely
influence signal quality
Position your Kramer TR-91 / TR-92 away from moisture, excessive sunlight
and dust
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TR-91 / TR-92 - Getting Started
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2.2 Recycling Kramer Products
The Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
aims to reduce the amount of WEEE sent for disposal to landfill or incineration by
requiring it to be collected and recycled. To comply with the WEEE Directive,
Kramer Electronics has made arrangements with the European Advanced
Recycling Network (EARN) and will cover any costs of treatment, recycling and
recovery of waste Kramer Electronics branded equipment on arrival at the EARN
facility. For details of Kramer’s recycling arrangements in your particular country
go to our recycling pages at http://www.kramerelectronics.com/support/recycling/.
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TR-91 / TR-92 - Overview
3 Overview
The TR-91 100W Audio Transformer is a 100W transformer for speaker signals.
The unit takes one 4Ω/8Ω channel from the speaker output of a power amplifier,
transforms it to 70V/100V and distributes it to an array of loudspeakers.
The TR-92 2x100W Audio Transformer is a 2x100W transformer for speaker
signals. The unit takes two 4Ω/8Ω channels from a speaker output of a power
amplifier, transforms them to 70V/100V and distributes them to an array of
loudspeakers.
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TR-91 / TR-92 - Defining the TR-91 and TR-92
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5
#
Feature
Function
1
INPUT (4Ω or 8Ω and COM)
Terminal Block Connectors
Connect to the + (4Ω/8Ω) and the – (COM)
terminals of an audio amplifier
2
OUTPUT Terminal Block
Connectors
Connect the 70V or 100V and COM terminals to a
70V/100V speaker
#
Feature
Function
1
CHANNEL 1
Terminal Block
Connectors
INPUT (4Ω or
8Ω and COM)
Connect to the + (4Ω/8Ω) and the – (COM) terminals of
an audio amplifier
2
OUTPUT
Connect the 70V or 100V and COM terminals to a
70V/100V speaker
3
CHANNEL 2
Terminal Block
Connectors
INPUT (4Ω or
8Ω and COM)
Connect to the + (4Ω/8Ω) and the – (COM) terminals of
an audio amplifier
4
OUTPUT
Connect the 70V or 100V and COM terminals to a
70V/100V speaker
4 Defining the TR-91 and TR-92
Figure 1 defines the TR-91 100W Audio Transformer and Figure 2 defines the
TR-92 2x100W Audio Transformer.
Figure 1: TR-91 100W Audio Transformer
Figure 2: TR-92 2x100W Audio Transformer
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TR-91 / TR-92 - Installing the TR-91 and TR-92
Note that you have to select the same power settings (70V or 100V),
as required, for both channels.
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Always switch off the power to each device before connecting it to your
TR-91 / TR-92. After connecting your TR-91 / TR-92, connect its power
and then switch on the power to each device.
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5 Installing the TR-91 and TR-92
This section explains how to install the Open-back ceiling speakers, that is:
Connecting the TR-92 (see Section 5.1)
Connecting the TR-91 (see Section 5.2)
5.1 Connecting the TR-92
To connect the TR-92, as illustrated in the example in Figure 3, do the following:
1. Connect an audio amplifier (for example, the Kramer 907xl Power/Amplifier
Mixer) to the TR-92 input channels by connecting the:
Left + and - OUTPUT terminal block connectors on the 907xl to the
CHANNEL 1 INPUT + (8Ω) and – (COM) terminal block connectors on
the TR-92
Right + and - OUTPUT terminal block connectors on the 907xl to the
CHANNEL 2 INPUT + (8Ω) and – (COM) terminal block connectors on
the TR-92
Alternatively, you can reverse the order and connect the left output on the 907xl to
CHANNEL 2 and the right output on the 907xl to CHANNEL 1.
2. Connect the OUTPUTs to a 70V/100V speaker (for example, the Kramer
Galil 8-C Ceiling Speakers) by connecting CHANNEL 1 to the Left speaker
and CHANNEL 2 to the Right speaker. For each channel connect the COM
terminal block connector to the - speaker connector and the 70V or 100V
OUTPUT terminal block connector to the + speaker connector.
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TR-91 / TR-92 - Installing the TR-91 and TR-92
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3. Connect the audio amplifier (the Kramer 907xl Power Amplifier/Mixer in this
example):
To up to two audio sources (not shown in Figure 3)
24V DC power adapter to the power socket and connect the adapter to
the mains electricity
For further details, you can download the 907xl and Galil 8-C user manuals from our
Web site
Figure 3: Connecting the TR-92 2x100W Audio Transformer
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TR-91 / TR-92 - Installing the TR-91 and TR-92
5.2 Connecting the TR-91
TR-91 has one channel so that you connect the TR-91 inputs and outputs in the
same way as the TR-92 is connected (see Section 5.1).
To connect the TR-91, as illustrated in the example in Figure 4, do the following:
1. Connect an audio amplifier (for example, the Kramer 907xl Power/Amplifier
Mixer) to the TR-91 INPUT + (8Ω) and – (COM) terminal block connectors.
Connect either the Left or Right + and - OUTPUT terminal block connectors
on the 907xl to the INPUT + and – terminal block connectors on TR-91.
2. Connect the OUTPUT to a 70V/100V speaker (for example, the Kramer
Galil 8-C Ceiling Speaker) by connecting the:
COM terminal block connector to the ground (-) speaker connector
70V or 100V OUTPUT terminal block connector to the + speaker
connector
3. Connect the audio amplifier (the Kramer 907xl Power Amplifier/Mixer in this
example):
To up to two audio sources (not shown in Figure 4)
24V DC power adapter to the power socket and connect the adapter to
the mains electricity
For further details, you can download the 907xl and Galil 8-C user manuals from our
Web site
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TR-91 / TR-92 - Installing the TR-91 and TR-92
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Figure 4: Connecting the TR-91 100W Audio Transformer
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TR-91 / TR-92 - Technical Specifications
TR-91
TR-92
INPUT:
Single low impedance
(4Ω / 8Ω or higher) speaker
input on a terminal block
connector
Dual low impedance
(4Ω / 8Ω or higher) speaker
input on a terminal block
connector
OUTPUT:
1 2 MAX POWER:
100W
VOLTAGE GAIN:
7.4dB/10.5dB (70V/100V)
BANDWIDTH (-3dB):
18kHz
OPERATING TEMPERATURE:
0° to +40°C (32° to 104°F)
STORAGE TEMPERATURE:
-10° to +60°C ( 14° to 140°F)
HUMIDITY:
10% to 90%, RHL non-condensing
DIMENSIONS
21.4cm x 16.2cm x 4.3cm (8.4" x 6.4" x 1.7") W, D, H
WEIGHT:
1.95kg (4.3lbs)
2.85kg (10.7lbs)
OPTIONS:
RK-1 19” rack mount adapter
Specifications are subject to change without notice at http://www.kramerelectronics.com
6 Technical Specifications
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For the latest information on our products and a list of Kramer distributors,
visit our Web site where updates to this user manual may be found.
We welcome your questions, comments, and feedback.
Web site: www.kramerelectronics.com
E-mail: info@kramerel.com
P/N:
2900-300384
Rev:
4
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SAFETY WARNIN G
Disconnect the unit from the power
supply before opening and servicing
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