Kramer 901 User manual

KRAMER ELECTRONICS LTD.
USER MANUAL
MODEL:
901
Personal Stereo Amplifier
P/N: 2900-006013 Rev 3

901 – Contents
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Contents
1Introduction 1
2Getting Started 2
2.1 Achieving the Best Performance 2
2.2 Safety Instructions 3
2.3 Recycling Kramer Products 3
3Overview 4
3.1 Defining the 901 Personal Stereo Amplifier 4
4Connecting and Operating the 901 6
5Technical Specifications 8
Figures
Figure 1: 901 Personal Stereo Amplifier 4
Figure 2: Connecting the 901 Personal Stereo Amplifier 7

901 - 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 video, audio, presentation, and broadcasting professionals
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 Routers;
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 901 Personal Stereo Amplifier, which
is ideal for the following typical applications:
Presentation rooms and multimedia applications for quick, local audio
amplification
Personal audio listening

2
901 - 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 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 901 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.
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901 - Getting Started
3
2.2 Safety Instructions
Caution:
There are no operator serviceable parts inside the unit
Warning:
Use only the Kramer Electronics input power wall
adapter that is provided with the unit
Warning:
Disconnect the power and unplug the unit from the wall
before installing
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/.
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4
901 - Overview
3 Overview
The 901 is a high−performance integrated personal stereo amplifier for
unbalanced stereo signals. It accepts a stereo audio signal and delivers a speaker
output of two watts RMS power per channel into a 4Ω load.
The 901 features:
Control knobs to adjust volume, bass, treble and balance
Selector switches to select the mic or line inputs and the type of microphone
(condenser or dynamic)
Outputs for a headphone set and for a pair of loudspeakers
3.1 Defining the 901 Personal Stereo Amplifier
This section defines the 901.
Figure 1: 901 Personal Stereo Amplifier
#
Feature
Function
1
Balance Control Knob
Adjusts the balance between the right and left
channels
2
Treble Control Knob
Controls the treble (high frequencies)
3
Bass Control Knob
Controls the bass (low frequencies)
4
Volume Control Knob
Controls the signal output level
5
ON LED
Illuminates when receiving power

901 - Overview
5
#
Feature
Function
6
Mic IN
Connects to the microphone
7
Type Cond/Dyn Selector Switch
Pushing in selects the dynamic microphone,
releasing selects the condenser microphone
8
Input Line/Mic Selector Switch
Pushing in selects the Mic input, releasing selects
the line input
9
Line IN (Right) RCA connector
Connects to the right stereo audio line level input
10
Line IN (Left) RCA connector
Connects to the left stereo audio line level input
11
Phones Out connector
Connects to the headphone set
12
SPKR Out (LGGR)Terminal Block
Connectors
Connect to the pair of loudspeakers
13
12V DC
+12V DC connector for powering the unit

6
901 - Connecting and Operating the 901
4 Connecting and Operating the 901
Always switch off the power to each device before connecting it to your
901. After connecting your 901, connect its power and then switch on
the power to each device.
To connect the 901 as illustrated in the example in Figure 2:
1. Connect one or both of the following inputs:
A stereo audio source (for example, a DVD Player) to the Left and
Right Line IN connectors; and /or
A microphone to the Mic IN input
2. Connect one or both of the following outputs:
Signals from both outputs (the headphones and the pair of loudspeakers) flow
simultaneously. When the 901 is functioning, connecting a headphone set to the
Phones Out connector will not automatically disconnect the pair of loudspeakers.
A pair of loudspeakers to the SPKR Out connector, by connecting the
left loudspeaker to the “L” (left) terminal block connector and to the
adjacent “G” (Ground) terminal block connector. Connect the right
loudspeaker to the “R” (right) terminal block connector and to the
adjacent “G” (Ground) terminal block connector; and /or
A headphone set to the Phones Out connector
3. Connect the 12V DC power adapter to the power socket and connect the
adapter to the mains electricity.
To operate your 901, as Figure 2 illustrates:
1. Choose the active audio source (either the stereo audio source or the mic)
via the Input Line/Mic selector switch.
Push in the Input Line/Mic selector switch to choose the Mic IN input.
When choosing a microphone, choose a dynamic microphone or
condenser via the Type Cond/Dyn selector switch
Push in the Type Cond/Dyn selector switch to choose the Dynamic microphone
input. Release the Type Cond/Dyn selector switch to choose the Condenser
input.
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901 - Connecting and Operating the 901
7
Release the Input Line/Mic selector switch to choose the Line IN input
2. Adjust the volume, bass, treble and balance controls as required.
Figure 2: Connecting the 901 Personal Stereo Amplifier

8
901 - Technical Specifications
5 Technical Specifications
INPUTS:
1 unbalanced stereo audio, 1Vpp/50kΩ on RCA connectors;
1 mono microphone, 5mV/3.2kΩ (condenser) 4.8kΩ
(dynamic) with a type selector, on a 6.5mm phone jack
OUTPUTS:
Unbalanced stereo audio 2W/4Ω per channel on both 3.5mm
mini jack and 4−pole detachable terminal block speaker
output
MAX. OUTPUT LEVEL:
8Vpp at Hi−Z load (headphones)
BANDWIDTH (-3DB):
37kHz
S/N RATIO:
74dB
CONTROLS:
Input selector switch, bass +/−10dB @100Hz, treble +/−12dB
@10kHz, volume, balance
COUPLING:
AC
AUDIO THD + NOISE:
0.04%
AUDIO 2ND HARMONIC:
0.24%
CROSSTALK:
−60dB @1kHz, 20kHz
POWER CONSUMPTION:
12V DC, 320mA
DIMENSIONS:
12cm x 7.5cm x 2.5 cm (4.7” x 2.95” x 0.98”) W, D, H
WEIGHT:
0.3kg (0.66lbs) approx..
ACCESSORIES:
Power supply, mounting bracket
OPTIONS:
RK−3T 19" rack adapter
Specifications are subject to change without notice at http://www.kramerelectronics.com

For the latest information on our products and a list of Kramer distributors,
visit our Web site where updates to this user manual may be found.
We welcome your questions, comments, and feedback.
Web site: www.kramerelectronics.com
E-mail: [e-mail]
P/N:
2900-006013
Rev:
3
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SAFETY WARNING
Disconnect the unit from the power
supply before opening and servicing