Kramer PA-225NET User manual

KRAMER ELECTRONICS LTD.
PRELIMINARY
USER MANUAL
MODEL:
PA-225NET
Power Amplifier
P/N: 2900-300408 Rev 1

PA-225NET – Contents
i
Contents
1Introduction 1
2Getting Started 2
2.1 Achieving the Best Performance 2
2.2 Safety Instructions 3
3Overview 4
4Defining the PA-225NET Power Amplifier 5
5Connecting the PA-225NET 6
5.1 Connecting the PA-225NET 6
5.2 Wiring the Inputs 7
5.3 Connecting the Remote Controls 9
5.4 Connecting Speakers 10
6Operating the PA-225NET 11
6.1 Indicators 11
6.2 Setting the Priority Switch 11
7Troubleshooting 12
8Technical Specifications 13
Figures
Figure 1: PA-225NET Power Amplifier Rear Panel 5
Figure 2: Connecting the PA-225NET Power Amplifier 6
Figure 3: Connecting a Balanced XLR Input 8
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 9
Figure 7: Connecting the Remote Volume Control 9
Figure 8: Connecting Galil 6-C Speakers to the PA-225NET 10

PA-225NET - 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 Video Products; GROUP 12: Digital Signage; and GROUP 13:
Audio, and GROUP 14: Collaboration.
Congratulations on purchasing your Kramer PA-225NET Power Amplifier, which is
ideal for the following typical applications:
Dante™ network applications
Presentation rooms and multimedia applications for local audio amplification
Personal audio listening (for example, a PC and portable CD player)

2
PA-225NET - 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
Use Kramer high performance cables.
Use only the power adapter that is supplied with this machine
Go to http://www.kramerav.com/downloads/PA-225NET 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 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-225NET 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.
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!

PA-225NET - Getting Started
3
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
!

4
PA-225NET - Overview
3 Overview
The Kramer PA-225NET is a high performance, networked power amplifier that
accepts Dante a network and two balanced, mono audio inputs on 3-pin terminal
blocks and converts the signal into a differential stereo audio output for speakers
on a 4-pin terminal block.
The PA-225NET Power Amplifier features:
Dante and analog local inputs
2 x 25W into 8Ω
2 x 35W into 4Ω
A balanced line-level output
Independent volume control per input
Priority switching between the Dante and local inputs
The PA-225NET Power Amplifier is housed in a Kramer TOOLS enclosure.

PA-225NET - Defining the PA-225NET Power Amplifier
5
4 Defining the PA-225NET Power Amplifier
Figure 1 defines the rear panel of the PA-225NET Power Amplifier.
Figure 1: PA-225NET Power Amplifier Rear Panel
#
Feature
Function
1
PRIORITY
Switch
NET
Priority is given to the Dante network signal, (see Section 6.2)
LOCAL
Priority is given to the Local input
2
Dante RJ-45 Ethernet Connector
Connect to the Dante audio source via the LAN
3
LEVEL
Trimmers
2
Turn clockwise to increase the amplitude of the second input
signal; turn anticlockwise to decrease the level
4
1
Turn clockwise to increase the amplitude of the first input
signal; turn anticlockwise to decrease the level
5
REMOTE 4-pin Terminal Block
Connect to the remote, 10kΩ volume control, (for example, the
W-LM) and mute-switch, (see Section 5.3)
6
ON LED
Lights blue when the device receives power
7
SIGNAL LED
Lights green when there is an input signal present
8
CLIP 1 LED
Lights red when the signal clips on the first input signal
9
CLIP 2 LED
Lights red when the signal clips on the second input signal
10
POWER 2-pin Terminal Block
Connect to the 48V power supply provided
11
2 LOCAL
IN1 Input
3-pin Terminal
Block
Connect to a line-level, balanced, stereo audio source, (for
example, a media player), see Section 5.2.1
12
3-pin Terminal
Block
Connect to a line-level, balanced, stereo audio source
13
2 LINE
OUT 1
Output
3-pin Terminal
Block
Connect to an unbalanced, stereo audio acceptor, (for
example, amplified speakers)
14
SPEAKER
22-pin Terminal
Block
Connect to the output 2 4Ω or 8Ω speaker
15
12-pin Terminal
Block
Connect to the output 1 4Ω or 8Ω speaker

6
PA-225NET - Connecting the PA-225NET
5 Connecting the PA-225NET
This chapter comprises the following sections:
Connecting the PA-225NET (see Section 5.1)
Wiring the inputs (see Section 5.2)
Connecting the remote controls (see Section 5.3)
5.1 Connecting the PA-225NET
Always switch off the power to each device before connecting it to your
PA-225NET. After connecting your PA-225NET, connect its power and
then switch on the power to each device.
Figure 2: Connecting the PA-225NET Power Amplifier
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PA-225NET - Connecting the PA-225NET
7
To connect the PA-225NET as illustrated in the example in Figure 2:
1. Connect a balanced, stereo audio source, (for example, a multimedia player)
to the 6-pin Local In terminal block, (see Section 5.2).
2. Connect a Dante network audio source to the Dante RJ-45 connector.
3. Set the Priority slide-switch to the required position, (see Section 6.2).
4. Connect the 3-pin Line Out 1 terminal block to the audio acceptor, (for
example, a recording device).
5. Connect a remote volume control, (for example, the W-LM) to the Remote
4-pin terminal block, (pins +V, LEVEL, and GND).
6. Connect a remote, momentary mute-switch to the Remote 4-pin terminal
block, (pins Mute and GND).
7. Connect the speakers to the Speaker 4-pin terminal block.
8. Connect the power adapter to the PA-225NET and plug the power adapter
into the mains power supply.
5.2 Wiring the Inputs
Your PA-225NET is provided with a 3-pin terminal block for its input connection.
This connector can accept either a balanced or an unbalanced connection,
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-225NET terminal block connector respectively. The following
diagrams illustrate how to connect standard XLR and TRS connectors.