Kramer 920 User manual

KRAMER ELECTRONICS LTD.

USER MANUAL

MODEL:

920

70V/100V Power Amplifier

P/N: 2900-300308 Rev 2

920 –Contents

Contents

1Introduction 1

2Getting Started 2

2.1 Achieving the Best Performance 2

2.2 Safety Instructions 2

2.3 Recycling Kramer Products 3

3Overview 4

4Defining the 920 Power Amplifier 5

5Connecting the 920 7

5.1 Connecting the 920 7

5.2 Connecting Speakers 8

5.3 Connecting a Microphone 9

6Technical Specifications 10

Figures

Figure 1: 920 Power Amplifier Front Panel 5

Figure 2: 920 Power Amplifier Rear Panel 6

Figure 3: Connecting the 920 Power Amplifier 7

Figure 4: Connecting One or Multiple Speakers to the 920 (100V) 8

Figure 5: Connecting One or Multiple Speakers to the 920 (70V) 9

Figure 6: Connecting a microphone 9

920 - 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 11 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 920 Power Amplifier, which is ideal for

the following typical applications:

Boardrooms

Classrooms

Hospitality

Transportation

Retail

Entertainment

Houses of worship

920 - 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.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).

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 920 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 power cord that is supplied with the unit

Warning:

Do not open the unit. High voltages can cause

electrical shock! Servicing by qualified personnel only

Warning:

Disconnect the power and unplug the unit from the wall

before installing

920 - Getting Started

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/.

920 - Overview

3 Overview

The Kramer 920 is a high−performance audio power amplifier for balanced,

unbalanced and microphone signals, that can output 200W of audio into 70V or

100V speaker systems.

The 920 Power Amplifier features:

70V or 100V amplification

Balanced, unbalanced and microphone inputs

Input level sensitivity adjustment for line and microphone inputs

Optional microphone 48V phantom power

Optional high-pass filter

1U rack-mount enclosure

920 –Defining the 920 Power Amplifier

4 Defining the 920 Power Amplifier

Figure 1 defines the 920 Power Amplifier.

Figure 1: 920 Power Amplifier Front Panel

Feature

Function

STATUS LED

Lights green when the device is active.

Lights orange when the device is in standby mode.

Lights red when the device is in protection mode

SIGNAL LED

Lights green when the input signal is present.

Lights yellow when the signal is clipping

MIC LED

Lights green when the microphone input signal is present

Figure 2: 920 Power Amplifier Rear Panel

Feature

Function

LINE INPUT

5-pin Terminal Block

Connect to the balanced stereo source

BAL/ RCA Selector

Selects the balanced or unbalanced (RCA) input selector

RCA Connectors

Connect to the unbalanced stereo source

LEVEL Trimmer

Adjusts the line-level input

MIC INPUT

3-pin Terminal Block

Connect to the microphone

LEVEL Trimmer

Adjusts the microphone input level

PHANTOM (48V) Switch

Phantom power on/off switch

MIC Switch

Microphone input on/off switch

SPEAKER OUT

3-pin Terminal Connector

70V or 100V output to speakers (see Section 5.2)

HIGH-PASS FILTER Switch

High-pass filter on/off selector

Mains Power Unit

Connect to the mains power

Mains Fuse for protecting the 920

Switch for turning the device on and off

920 –Defining the 920 Power Amplifier

920 - Connecting the 920

5 Connecting the 920

This chapter comprises the following sections:

Connecting the 920 (see Section 5.1)

Connecting speakers (see Section 5.2)

Connecting a microphone (see Section 5.3)

5.1 Connecting the 920

Always switch off the power to each device before connecting it to your

920. After connecting your 920, connect its power and then switch on

the power to each device.

Figure 3: Connecting the 920 Power Amplifier

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