Kramer 914 User manual

KRAMER ELECTRONICS LTD.

PRELIMINARY

USER MANUAL

MODEL:

914

Power Amplifier

P/N: 2900-300280 Rev 1

914 – Contents

Contents

1Introduction 1

2Getting Started 2

2.1 Achieving the Best Performance 2

3Overview 3

3.1 Energy Star 3

4Defining the 914 Power Amplifier 5

5Connecting the 914 7

5.1 Connecting the 914 7

5.2 Connecting the Speakers 8

5.3 Connecting a Balanced and Unbalanced Stereo Audio Input 9

6Operating the 914 10

6.1 Stereo and Bridged Mono Modes 10

6.2 Operating the 914 Remotely 10

7Technical Specifications 11

Figures

Figure 1: 914 Power Amplifier Front Panel 5

Figure 2: 914 Power Amplifier Rear Panel 6

Figure 3: Connecting the 914 Power Amplifier 8

Figure 4: Connecting Speakers to the 914 Power Amplifier 8

Figure 5: Balanced Stereo Audio Connection 9

Figure 6: Unbalanced Stereo Audio Input Connection 9

914 - 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.

Congratulations on purchasing your Kramer 914 Power Amplifier, which is ideal for

the following typical applications:

Presentation rooms and multimedia applications for local audio amplification

Personal audio listening (for example, a PC and portable CD player)

914 - 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 high resolution cables.

Use only the power cord that is supplied with this machine

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 914 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.

914 - Overview

3 Overview

The Kramer 914 is a high performance power amplifier that accepts a balanced

stereo audio input on a 5-pin terminal block and converts the signal into a

differential stereo audio output for speakers on a 4-pin terminal block.

The 914 Power Amplifier features:

An audio level knob to adjust the volume

Remote control

Stereo and bridged mono modes of operation

Independent left and right channel monitoring LEDs

Easy-to-connect, detachable terminal blocks

The 914 Power Amplifier is housed in a Kramer TOOLS enclosure.

3.1 Energy Star

The 914 Power Amplifier meets the ENERGY STAR audio specification and draws

less than 1 watt while in standby mode, offers a sleep mode, auto power-down,

and meets the specified efficiency requirements.

To comply with the Energy Star requirements the 914 provides the following

operational modes:

1. On Mode—Where the 914 is connected to a mains power source, has been

activated and is capable of providing amplification. The common terms

“active”, “in-use” and “normal operation” also describe this mode.

Active State—A state within On Mode in which the 914 provides

amplification

Standby State—A state within On Mode in which the 914 does not

provide amplification

914 - Overview

2. Standby Mode—Where the 914 is connected to a mains power source, is

incapable of providing amplification, and offers the following user oriented or

protective functions:

It facilitates the activation of other modes (including activation of On

Mode) by a remote switch (including remote, contact-closure switches),

and timer

The front panel’s information LEDs continuously display the unit’s status

The sensor-based functions sensor-based functions function

continuously. For purposes of this specification, Sleep Mode is defined

as the time when the product is connected to a power source, does not

produce sound, and is waiting to be switched to On Mode by a direct or

indirect signal

3. Off Mode—Where the product is connected to a mains power source, is not

providing amplification, and cannot be switched into any other mode except

by user actuation of a manual power switch.

914 - Defining the 914 Power Amplifier

4 Defining the 914 Power Amplifier

Figure 1 defines the front panel of the 914 Power Amplifier.

Figure 1: 914 Power Amplifier Front Panel

Feature

Function

ON LED

Lights green when the unit is powered on

LEFT

Channel

PROTECT LED

Lights red when the left channel signal protection is

activated

CLIP LED

Lights yellow when the left channel signal is clipping

SIGNAL LED

Lights green when there is a signal present on the left

channel

RIGHT

Channel

PROTECT LED

Lights red when the right channel signal protection is

activated

CLIP LED

Lights yellow when the right channel signal is clipping

SIGNAL LED

Lights green when there is a signal present on the right

channel

914 - Defining the 914 Power Amplifier

Figure 2 defines the rear panel of the 914 Power Amplifier.

Figure 2: 914 Power Amplifier Rear Panel

Feature

Function

INPUT

L+ L–G R+ R–5-pin

Terminal Block

Connect to a balanced, stereo, analog audio

source

LEVEL Trimmer

Turn clockwise to increase the input level and

anticlockwise to decrease the input level

SPEAKER

OUT

L–L+ R–R+ 4-pin

Terminal Block

Connect to the speakers (see Section Error!

Reference source not found.)

STEREO

BRIDGED MONO

Switch

Push switch up to operate in standard stereo

mode; push switch down to operate in

bridged mono mode (see Section Error!

Reference source not found.)

REMOTE

V+ LEVEL GND

STANDBY MUTE 5-pin

Terminal Block

Connect to the output level control

potentiometer (10kΩ), and the remote

Standby and Mute switches (see Section

Error! Reference source not found.)

ENABLE DISABLE

Switch

When the switch is up, the remote volume

control is enabled; when the switch is down,

the remote volume control is disabled

Mains Power

Unit

Connect to the mains power

Mains Fuse for protecting the 914

Switch for turning the device on and off

914 - Connecting the 914

5 Connecting the 914

This chapter comprises the following sections:

Connecting the 914 (see Section 5.1)

Connecting the speakers (see Section 5.2)

5.1 Connecting the 914

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

914. After connecting your 914, connect its power and then switch on

the power to each device.

To connect the 914 as illustrated in the example in Figure 3:

1. Connect the balanced, stereo audio source (for example, a multimedia

player) to the INPUT 5-pin terminal block (see Section 5.3).

2. Connect the Speaker Out terminal block to a pair of speakers. Connect the

left speaker to the L+ and L–pins, and the right speaker to the R–and R+

pins (in stereo mode). For bridged mono mode, see Section 5.2.

Note: Do not ground the speakers.

3. Optional—Connect the GND,LEVEL and V+ pins on the 10V CONTROL

terminal block connector to a remote 10kΩ volume control.

4. Optional—Connect the Standby and Mute pins to remote control switches

(see Section Error! Reference source not found.).

5. Connect the supplied power cord to the 914 power socket and to the mains

electricity (not shown in Figure 3).

6. Adjust the volume using the Level control on the rear panel.

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