Kramer 905 User manual

Kramer Electronics, Ltd.
USER MANUAL
Model:
905
Power Amplifier

Contents
i
Contents
1Introduction 1
2Getting Started 1
2.1 Quick Start 2
3Overview 3
4Your 905 Power Amplifier 3
5Installing the 905 in a Rack 6
6Connecting the 905 Power Amplifier 7
6.1 Connecting the 905 via RS-232 8
7Operating the 905 Power Amplifier 8
7.1 Using the Front Panel Buttons 8
7.1.1 Adjusting the Volume 8
7.1.2 Muting the Output 8
7.1.3 Mixing the Input Signals 9
7.2 Using the Audio Control Program 9
7.3 Using Serial Commands 10
8Technical Specifications 11
9905 Commands in Protocol 3000 12
9.1 Operating Commands 12
9.2 Help Commands 12
9.3 Device Initiated Messages 12
9.4 Result and Error Codes 12
9.5 Basic Routing Commands 12
9.6 Audio Parameters Commands 13
9.7 Protocol 3000 Syntax 14
9.7.1 Host Message Format 14
9.7.1.1 Simple Command 14
9.7.1.2 Command String 14
9.7.1.3 Device Message Format 14
9.7.1.4 Device Long Response 14
9.7.2 Command Terms 14
9.7.3 Entering Commands 15
9.7.4 Command Forms 15
9.7.5 Command Chaining 15
9.7.6 Maximum String Length 16

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Contents
ii
Figures
Figure 1: 905 Power Amplifier 4
Figure 2: Connecting the 905 Power Amplifier 7
Figure 3: Audio Control Window 10
Tables
Table 1: 905 Power Amplifier Functions 5
Table 2: 905 Technical Specifications 11
Table 3: Communication Parameters 11

Introduction
1
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 groups1
Thank you for purchasing the Kramer 905 Power Amplifier, which is ideal
for:
that are clearly
defined by function.
•Presentation rooms and multimedia applications for quick, local audio
amplification
•Personal audio listening (for example, a PC and portable CD player)
The package includes the following items:
•905 Power Amplifier
•Power cord2
•Windows®-based Kramer control software
•This user manual3
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 cables4
1 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; GROUP 11: Sierra Products
2 We recommend that you use only the power cord supplied with this device
3 Download up-to-date Kramer user manuals from our Web site at http://www.kramerelectronics.com
4 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Contents
2
2.1 Quick Start
This quick start chart summarizes the basic setup and operation steps.

Overview
3
3
3 Overview
The Kramer 905 is a high-performance power amplifier for line-level stereo
audio signals. It accepts either a stereo audio signal on an RCA connector or
a balanced stereo audio signal on a terminal block connector. It delivers a
speaker output of 80 watts RMS per channel into a 4Ωload on a 10A 4-pin
terminal block connector.
The 905 features:
•Two input selector buttons
•Two buttons for adjusting the volume and a mute button
•An unbalanced stereo input on RCA connectors and a balanced
stereo input on a terminal block
•An RS-232 port
Control your 905:
•Directly, via the front panel push buttons
•By RS-232 serial commands transmitted by a touch screen system,
PC, or other serial controller
The 905 is housed in a 19” 1U enclosure and is powered by a universal AC
power supply.
To achieve the best performance:
•Use only good quality connection cables1
•Avoid interference from neighboring electrical appliances that may
adversely influence signal quality and position your Kramer 905
away from moisture, excessive sunlight and dust
to avoid interference,
deterioration in signal quality due to poor matching, and elevated
noise levels (often associated with low quality cables).
4 Your 905 Power Amplifier
Figure 1 and Table 1 define the 905.
1 Available from Kramer Electronics on our Web site at http://www.kramerelectronics.com

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Your 905 Power Amplifier
4
Figure 1: 905 Power Amplifier

Your 905 Power Amplifier
5
5
Table 1: 905 Power Amplifier Functions
#
Feature
Function
1 INPUT SELECTOR 1,2 Buttons Press to select the input audio source 1 (unbalanced) or 2
(balanced)
2 Volume ↑↓ Buttons Press to increase or decrease the output volume
3 MUTE Button Press to turn off or turn on the audio output. The button
illuminates when the audio output is disabled
4 INPUT 1 Left and Right RCA Connectors Connect to the unbalanced stereo audio source
5 INPUT 2 Terminal Block Connector Connect to the balanced stereo audio source
6 SPKR OUT L+ L- / R+ R-Terminal
Block Connector
Connect to a balanced stereo acceptor (speakers)
7 RS-232 9-pin D-sub Connector Connects to a PC or serial controller
8 PROGRAM Switch Switch up before performing a firmware upgrade, leave
down for normal operation

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Installing the 905 in a Rack
6
5 Installing the 905 in a Rack
This section provides instructions for rack mounting the 1U unit.

Connecting the 905 Power Amplifier
7
7
6 Connecting the 905 Power Amplifier
To connect the 905, as illustrated in the example in Figure 2, do the following:
1. Connect an unbalanced stereo audio source (for example, the unbalanced
output of the DVD 1 player) to the L and R INPUT 1 RCA connectors.
2. Connect a balanced stereo audio source (for example, the balanced stereo
audio output of the DVD 2 player) to the INPUT 2 terminal block
connector.
3. Connect the OUTPUT terminal block to a pair of loudspeakers:
Connect the “L+” and the “L-” terminal block connectors to the left
loudspeaker, and the “R+” and the “R-” terminal block connectors to the
right loudspeaker. Do not ground the loudspeakers.
4. Connect the power cord to the power socket and connect the cord to the
mains electricity (not shown in Figure 2).
5. If required connect a PC and/or controller to the RS-232 port, see section
6.1.
Figure 2: Connecting the 905 Power Amplifier