KRAMER ELECTRONICS LTD.
PRELIMINARY
USER MANUAL
MODEL:
PA-150
70V/100V 50W Power Amplifier
P/N: 2900-300406 Rev 1
PA-150 – Contents
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Contents
1 Introduction 1
2 Getting Started 2
2.1 Achieving the Best Performance 2
2.2 Safety Instructions 2
2.3 Recycling Kramer Products 3
3 Overview 4
4 Defining the PA-150 50W Power Amplifier 5
5 Connecting the PA-150 6
5.1 Connecting the PA-150 6
5.2 Wiring the Inputs 7
5.3 Connecting Speakers 9
5.4 Connecting the Remote Volume Control 10
6 Operating the PA-150 11
6.1 Indicators 11
7 Troubleshooting 12
8 Technical Specifications 13
Figures
Figure 1: PA-150 50W Power Amplifier Rear Panel 5
Figure 2: Connecting the PA-150 50W Power Amplifier 6
Figure 3: Connecting a Balanced XLR Input 7
Figure 4: Connecting a Balanced 6.5mm Phone Jack 8
Figure 5: Connecting an unbalanced RCA Input 8
Figure 6: Connecting an unbalanced 6.5mm Phone Jack 8
Figure 7: Connecting One or Multiple Speakers to the PA-150 (100V) 9
Figure 8: Connecting One or Multiple Speakers to the PA-150 (70V) 10
Figure 9: Connecting the Remote Volume Control 10
PA-150 - Introduction
1
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 the video, audio, presentation, and broadcasting
professional 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 14 groups that are clearly defined
by function: GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Matrix
Switchers; 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 Products; GROUP 12: Digital Signage; and GROUP 13: Audio,
and GROUP 14: Collaboration.
Congratulations on purchasing your Kramer PA-150 50W Power Amplifier, which
is ideal for the following typical applications:
Boardrooms
Classrooms
Hospitality
Transportation
Retail
Entertainment
Houses of worship
2
PA-150 - Getting Started
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
Go to http://www.kramerav.com/downloads/PA-150 to check for up-to-date
user manuals, application programs, and to check if firmware upgrades are
available (where appropriate).
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 PA-150 away from moisture, excessive sunlight and
dust
This equipment is to be used only inside a building. It may only be
connected to other equipment that is installed inside a building.
2.2 Safety Instructions
Caution:
There are no operator serviceable parts inside the unit
Warning:
Use only the Kramer Electronics power supply that is
provided with the unit
Warning:
Disconnect the power and unplug the unit from the wall
before installing
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PA-150 - Getting Started
3
2.3 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/.
4
PA-150 - Overview
3 Overview
The Kramer PA-150 is a high−performance mono, audio power amplifier for
balanced signals that can output 50W of audio into 70V or 100V speaker systems.
The PA-150 50W Power Amplifier features:
Output power 50 W into one channel
70V or 100V amplification
Line-level, balanced input
Input level sensitivity adjustment
Remote volume and mute control
PA-150 - Defining the PA-150 50W Power Amplifier
5
4 Defining the PA-150 50W Power Amplifier
Figure 1: PA-150 50W Power Amplifier Rear Panel
#
Feature
Function
1
INPUT 3-pin Terminal
Block
Connect to the line-level, balanced, stereo audio source, (for
example, a media player), see Section 5.2.1
2
LEVEL Trimmer
Turn clockwise to increase the amplitude of the input signal; turn
anticlockwise to decrease the level
3
REMOTE 4-pin Terminal
Block
Connect to the remote, 10v volume control, (for example, the
W-LM) and mute-switch, (see Section 5.4)
4
ON LED
Lights blur when the device receives power
5
SIGNAL LED
Lights green when there is an input signal present
6
CLIP LED
Lights red when the signal clips on the output
7
POWER 2-pin Terminal
Block
Connect to the power supply provided, (see Section 5.4)
8
SPEAKER 3-pin Terminal
Block
Connect to either the 100V speaker chain or to the 70V speaker
chain, (see Section 5.3).
Note: Only one of the outputs can be used at a time
6
PA-150 - Connecting the PA-150
5 Connecting the PA-150
This chapter comprises the following sections:
Connecting the PA-150 (see Section 5.1)
Wiring the inputs (see Section 5.2)
Connecting speakers (see Section 5.3)
Connecting the Remote Volume Control (see Section 5.4)
5.1 Connecting the PA-150
Always switch off the power to each device before connecting it to your
PA-150. After connecting your PA-150, connect its power and then
switch on the power to each device.
Figure 2: Connecting the PA-150 50W Power Amplifier
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PA-150 - Connecting the PA-150
7
To connect the PA-150 as illustrated in the example in Figure 2:
1. Connect a balanced audio source, (for example, a PC) to the INPUT 3-pin
terminal block.
2. Connect the speaker(s) to the SPEAKER OUT 3-pin terminal block, (see
Section 5.3).
3. Connect a remote volume control, (for example, the W-LM) to the Remote
4-pin terminal block, (pins +V, LEVEL, and GND).
4. Connect a remote, momentary mute-switch to the Remote 4-pin terminal
block, (pins Mute and GND).
5. Connect the power adapter to the PA-150 and plug the power adapter into
the mains power supply.
5.2 Wiring the Inputs
Your PA-150 is provided with a 3-pin terminal block for its input connection. This
connector can accept either a balanced or an unbalanced signal however, some
modifications must be made for an unbalanced connection.
5.2.1 Wiring Balanced Inputs
When using a balanced input source and connector, you must ensure that the hot,
cold, and ground pins of the connector are matched up to the +, –, and ground
pins of the PA-150 terminal block connector respectively. The following diagrams
illustrate how to connect standard XLR and TRS connectors.
Figure 3: Connecting a Balanced XLR Input
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PA-150 - Connecting the PA-150
Figure 4: Connecting a Balanced 6.5mm Phone Jack
5.2.2 Wiring Unbalanced Inputs
When using an unbalanced input source, a jumper must be added between the
negative (–) and ground terminals. The unbalanced source is connected to the
positive (+) and ground terminals.
Note: A jumper is required for connecting an unbalanced input.
Figure 5: Connecting an unbalanced RCA Input
Figure 6: Connecting an unbalanced 6.5mm Phone Jack
PA-150 - Connecting the PA-150
9
5.3 Connecting Speakers
You can connect one or more 70V or 100V speakers to the PA-150. The following
table details the cable requirements for connecting the PA-150 to speakers.
Distance (ft.)
Wire Gauge (AWG)
Up to 500
22
500 to 1000
20
Over 1000
18
Note: Only one of the outputs can be used at a time.
When connecting more than one speaker they must be connected in parallel as
shown in Figure 7 (100V speakers) and Figure 8 (70V speakers).
Figure 7: Connecting One or Multiple Speakers to the PA-150 (100V)
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PA-150 - Connecting the PA-150
Figure 8: Connecting One or Multiple Speakers to the PA-150 (70V)
5.4 Connecting the Remote Volume Control
The following diagram illustrates how to connect the W-LM Remote Volume
Control to the PA-150.
Note: The remote volume control overrides the level control on the rear of the
device.
Figure 9: Connecting the Remote Volume Control
PA-150 - Operating the PA-150
11
6 Operating the PA-150
6.1 Indicators
The following table details the LED indicators.
Label
Color
Description
SIGNAL
Green
There is an input signal present
ON
Blue
The device is receiving power
CLIP
Red
The input signal is being clipped
12
PA-150 - Troubleshooting
7 Troubleshooting
The PWR LED does not light.
Check that the power adapter is plugged into a functioning outlet and that the
adapter is correctly connected to the PA-150.
No output is heard from the speakers; the CLIP LED lights.
Check that the level control and remote volume control are not turned down.
Check that the input and output connections are secure. Insure that the SIG LED
lights to denote a signal. If there is no signal detected, check the signal source and
that the level controls are set high enough.
Amplifier overheats and/or shuts down.
Check the CLIP LED on the rear of the amplifier to see if the signal is overdriving
(the signal light flashes red frequently). Overdriving the amplifier for extended
periods can cause a thermal shutdown.
Output sound is distorted or cracking.
Check all cables for damage or loose connections and reduce the gain on the
input signal at the mixer or preamp level. Replace the cables and speakers
temporarily to see if this resolves the problem.
PA-150 - Technical Specifications
13
8 Technical Specifications
INPUTS:
1 INPUT, balanced, on a 3-pin terminal block connector
OUTPUTS:
1 OUTPUT 100V/70V on a 3-pin terminal block connector
POWER OUTPUT:
50W x 1 @70V/100V
FREQUENCY RESPONSE:
100Hz (0dB) to 20kHz (–3dB)
POWER BANDWIDTH:
80Hz to 30kHz (±3dB)
THD+N:
<0.1%
SIGNAL to NOISE RATIO:
>80dB
REMOTE VOLUME CONTROL:
0-10V DC, 4-pin Block
INPUT SENSITIVITY:
0.5V (–3dBV)
STANDARD VOLTAGE GAIN:
150X (43dB) @70V
INPUT IMPEDANCE:
(Balance/Unbalanced)
20kΩ/10kΩ
INDICATOR LEDs:
On, Signal, Clip
POWER CONSUMPTION:
48V DC, 1.3A
CLASS:
D
OPERATING TEMPERATURE:
0° to +40°C (32° to 104°F)
STORAGE TEMPERATURE:
–40° to +70°C (–40° to 158°F)
HUMIDITY:
10% to 90%, RHL non-condensing
COOLING:
Convection
ENCLOSURE TYPE:
Aluminium chassis
PLENUM RATING:
UL 2043 Approved
DIMENSIONS:
15.2cm x 10.2cm x 3.2cm (6.0" x 4.0" x 1.25") W, D, H
WEIGHT:
0.46kg (1.01bs) approx.
SHIPPING WEIGHT:
1.06kg (2.34lbs) approx.
INCLUDED ACCESSORIES:
Power supply 48V DC
Specifications are subject to change without notice at http://www.kramerelectronics.com
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
SAFETY WARNING
Disconnect the unit from the power
supply before opening and servicing
P/N:
2900-300406
Rev:
1
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