Kramer 912 Manuel utilisateur

KRAMER ELECTRONICS LTD.

USER MANUAL

MODEL:

912

Power Amplifier

P/N: 2900-000684 Rev 2

912 – Contents i

Contents

1Introduction 1

2Getting Started 2

2.1Achieving the Best Performance 2

3Overview 3

3.1Defining the 912 Power Amplifier 3

4Connecting the 912 5

5Technical Specifications 7

Figures

Figure 1: 912 Power Amplifier Front and Rear Panels 4

Figure 2: Connecting the 912 Power Amplifier 6

912 - 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 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 912 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)

2 912 - 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 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 to avoid interference, deterioration

in signal quality due to poor matching, and elevated noise levels (often

associated with low quality cables)

•Avoid interference from neighboring electrical appliances that may adversely

influence signal quality

•Position your Kramer 912 away from moisture, excessive sunlight and dust

912 - Overview 3

3 Overview

The Kramer 912 is a high performance power amplifier that can accept a balanced

stereo audio input on a 5-pin terminal block, and an unbalanced stereo audio input

on two RCA connectors.

Both inputs can be connected simultaneously.

The balanced and unbalanced stereo audio inputs are converted to a differential

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

The 912 Power Amplifier features:

•An audio level knob to adjust the volume

•The ability to control the volume remotely using a remote 10V volume control

•Mixing of the unbalanced and balanced inputs

•An ON LED indicating that the unit is receiving power

•A 12V power source making it ideal for field operation

•Easy-to-connect, detachable terminal blocks

The 912 Power Amplifier is housed in a Kramer TOOLS enclosure.

3.1 Defining the 912 Power Amplifier

Figure 1 defines the 912 Power Amplifier.

4 912 - Overview

Figure 1: 912 Power Amplifier Front and Rear Panels

Front and Rear Panel Features

# Feature Function

1 CONTROL Button Press in for remote volume control using the 10V

Control connection, release to control the volume

using the front panel Volume knob (see item 2).

Warning: When a remote volume control is

connected, switching between the volume controls

may cause a sudden, large volume level change

2 VOLUME Control Knob Turn clockwise to increase the volume,

anticlockwise to decrease the volume

3 OVER LED Lights red when the amplifier overheats

Overheating causes the amplifier to automatically

reduce power to protect the unit from damage. Once

the unit cools down, full power is restored

4 ON LED Lights green when the unit receives power

5 IN 1

Unbalanced

Stereo Audio

Input

LEFT RCA

Connector

Connect to the unbalanced stereo audio source

You can connect both the unbalanced and the

balanced inputs simultaneously—the inputs will be

mixed

RIGHT RCA

Connector

6 IN 2 (L+ L- G R+ R-) Balanced

Stereo Audio Input Removable

Terminal Block

Connect to the balanced stereo audio source

You can connect both the unbalanced and the

balanced inputs simultaneously—the inputs will be

mixed

7 OUT (L+ L- R+ R-)Stereo

Output Terminal Block

Connector

Connect to the speakers

8 10V CONTROL (GND VOL V+)

Control Removable Terminal

Block

Connect to a remote 10V volume control (see

Section 4). Connect G to one end of the

potentiometer, VOL to the wiper, V+ to the

opposite end of the potentiometer

9 12V DC Connect to the supplied power adapter, center pin

positive

912 - Connecting the 912 5

4 Connecting the 912

This section explains how to connect and operate your 912.

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

912. After connecting your 912, connect its power and then switch on

the power to each device.

To connect the 912, as illustrated in the example in Figure 2:

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

player) to the LEFT and RIGHT IN 1 RCA connectors.

Or alternatively, connect the balanced stereo audio source to the GND, left (L+ L-) and

right (R+ R-) input terminal block

2. Connect the OUT speaker 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.

Note: Do not ground the speakers.

3. Optional—Connect the G, 2 and V+ pins on the 10V CONTROL terminal

block connector to a remote 10V volume control.

4. Select the volume control method using the CONTROL button on the front

panel. Press CONTROL (10V position) to select the remote 10V volume

control.

5. Connect the 12V DC power adapter to the 912 power socket and to the

mains electricity (not shown in Figure 2).

6. Adjust the volume using the method selected in Step 4.

6 912 - Connecting the 912

Figure 2: Connecting the 912 Power Amplifier

912 - Technical Specifications 7

5 Technical Specifications

INPUTS: 1 unbalanced stereo 1Vpp/10kΩon 2 RCA connectors

1 balanced stereo +4dBu/10kΩon a 5-pin removable

terminal block

OUTPUT: 1 stereo speaker output on a 4-pin removable large

terminal block

INPUT SENSITIVITY: Unbalanced: 440mVpp

Balanced: 105mVpp

OUTPUT POWER: 5.5W RMS power per channel into a 8Ωload

8.4W RMS power per channel into a 4Ωload

AMPLIFIER TYPE: Class D

MAXIMUM VOLTAGE

GAIN:

Unbalanced: 32.6dB (x43)

Balanced: 36.2dB (x65)

BANDWIDTH (-3dB): >20kHz

S/N RATIO: Unbalanced 60dB

Balanced 63dB

CONTROLS: 8Ω: Unbalanced <-68 to 33dB, Balanced -60 to 36dB

4Ω: Unbalanced -48 to 40dB, Balanced -60 to 38dB

COUPLING: Input: Unbalanced DC (internal AC path), Balanced AC

Output: DC

AUDIO THD + NOISE: 8Ω: Unbalanced 2.3%, Balanced 2.5%

4Ω: Unbalanced 3.1%, Balanced 4.3%

AUDIO 2nd HARMONIC: 8Ω: Unbalanced 1.4%, Balanced 1.4%

4Ω: Unbalanced 2.7%, Balanced 3.5%

POWER SOURCE: 12V DC, 2.8A Full load 4Ω@10% THD+N

DIMENSIONS: 12cm x 8.5cm x 2.5cm (4.7" x 3.4" x 1") W, D, H

WEIGHT: 0.3kg (0.67lbs) approx.

ACCESSORIES: Power supply, mounting bracket

OPTIONS: RK-3T 19” rack adapter

Specifications are subject to change without notice at http://www.kramerelectronics.com

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