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

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 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)

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.

PA-225NET - Getting Started

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

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

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

PRIORITY

Switch

NET

Priority is given to the Dante network signal, (see Section 6.2)

LOCAL

Priority is given to the Local input

Dante RJ-45 Ethernet Connector

Connect to the Dante audio source via the LAN

LEVEL

Trimmers

Turn clockwise to increase the amplitude of the second input

signal; turn anticlockwise to decrease the level

Turn clockwise to increase the amplitude of the first input

signal; turn anticlockwise to decrease the level

REMOTE 4-pin Terminal Block

Connect to the remote, 10kΩ volume control, (for example, the

W-LM) and mute-switch, (see Section 5.3)

ON LED

Lights blue when the device receives power

SIGNAL LED

Lights green when there is an input signal present

CLIP 1 LED

Lights red when the signal clips on the first input signal

CLIP 2 LED

Lights red when the signal clips on the second input signal

POWER 2-pin Terminal Block

Connect to the 48V power supply provided

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

3-pin Terminal

Block

Connect to a line-level, balanced, stereo audio source

2 LINE

OUT 1

Output

3-pin Terminal

Block

Connect to an unbalanced, stereo audio acceptor, (for

example, amplified speakers)

SPEAKER

22-pin Terminal

Block

Connect to the output 2 4Ω or 8Ω speaker

12-pin Terminal

Block

Connect to the output 1 4Ω or 8Ω speaker

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

PA-225NET - Connecting the PA-225NET

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.

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