musikelectronic geithain RL903BK User manual

musikelectronic geithain
RL 903BK
Instructions for installation and use

TABLE OF CONTENTS II
musikelectronic geithain GmbH RL 903BK
Table of contents
1 Introduction 1
2 Disclaimer 2
3 System description 3
4 Basic information 4
4.1 Guidelines 4
4.2 Safety instructions 4
4.3 Unboxing 6
4.4 Delivery contents 6
4.5 Cleaning 6
4.6 Environmental conditions 6
4.7 Guarantee acknowledgements 6
5 Positioning 7
5.1 Positioning near walls 7
5.2 Stereo operation 8
5.3 Surround operation 9
6 Set-up the speakers 10
6.1 Connecting the RL 903BK 10
6.2 Cable connection 11
6.3 Status indication 11
7 Specications 12
8 Acoustic measurements 14
9 Notes 15

INTRODUCTION 1
musikelectronic geithain GmbH RL 903BK
1 Introduction
Dear customer,
Thank you for the trust you have put in us by buying these speakers. You decided upon a quality
product that in regard to tonal and technical characteristics complies to the utmost expectations.
The usual burn-in period is not required, because the speakers are articially aged in-house.
Please read the technical description and manual to take advantage of the capabilities
of these speakers and ensure safe operation.

DISCLAIMER 2
musikelectronic geithain GmbH RL 903BK
2 Disclaimer
Technical data and appearances are subject to changes without notice. Errors and omissions
excepted. Musikelectronic Geithain GmbH assumes no liability for any loss which may be suffered
by any person who relies either wholly or in part upon any description, photograph or statement
contained herein. Musikelectronic Geithain GmbH products are sold through authorized fulllers
and resellers only. Fulllers and resellers are not agents of Musikelectronic Geithain GmbH and
have absolutely no authority to bind Musikelectronic Geithain GmbH by any express or implied
undertaking or representation. This manual is copyrighted. No part of this manual may be reproduced
or transmitted in any form or by any means, electronic or mechanical, including photocopying and
recording, or by any information storage or retrieval system without the prior written permission of
Musikelectronic Geithain GmbH.
All rights reserved
Copyright © 2018 Musikelectronic Geithain GmbH

SYSTEM DESCRIPTION 3
musikelectronic geithain GmbH RL 903BK
3 System description
The loudspeaker of the type RL903BK is a main control room loudspeaker with cardioid radiation
characteristic within the range of 35 Hz to 250 Hz which can be applied universally in broadcast
vans of medium and large size. Through this radiation characteristic reections at the backside wall
behind the loudspeaker are minimized. The coaxial mid- and high-frequency unit is combined with
a powerful long-throw bass driver unit. By construction of the loudspeaker in coaxial technology we
can reach excellent localization behaviour and optimum imaging of phantom sources. Additionally, by
means of various constructive methods the loudspeaker produces extreme low non-linear distortions.
With the special geometric arrangement of the mid- and high-frequency driver unit as well as with
the relatively small asymmetric designed front the result gives excellent tone colour neutrality, i.e.
sound coloration at a minimum level. In spite of compact dimensions of the box a lower frequency
of 35 Hz could be reached.
The 3-way MOSFET-amplier with active crossover is integrated into the back of the cabinet and is
hinged for service purposes. An intermittent LED indicates sound pressure levels within the overload
margin of 3dB and warns of clipping. Beyond this limit the output level of the high- and mid-
frequency drivers get damped by 20dB to protect the speaker’s components.
Optionally, the mid- and high-frequency unit can be supplied revolved by 90 degrees, that way the
speaker can be installed either in vertical or horizontal position. For matching the monitor to the
room-acoustical situation within the listening room and its position, the frequency response can be
corrected at higher and lower frequencies.
A variety of special stands and racks is available as accessories. According xing elements have been
integrated into the loudspeaker cabinet.

BASIC INFORMATION 4
musikelectronic geithain GmbH RL 903BK
4 Basic information
4.1 Guidelines
This product complies to requirements of current European and national guidelines (2004/108/EG
Electromagnetical Compatiblity). The conformity is ascertained, corresponding declarations and
records are deposited with the manufacturer.
Products built by us belong to B2C-class of the WEEE guidelines and must not
be disposed with domestic waste.
4.2 Safety instructions
Like using any other electrical device you should observe the following operation guidelines, safety
instructions and warning signs to ensure optimum functionality and safety of operation!
;Read these instructions carefully.
;Keep these instructions during the life cycle at a safe place. The instructions are an important
part of the product.
;Heed all warnings. Follow all instructions.
;The product may only be used in accordance with the information provided in the user manual.
Before and during the usage of the amplier please ensure that all recommendations, especially
the safety recommendations in the user manual, are adhered to.
;Do not place this product on an unstable cart, stand, tripod, bracket, or table. The product may
fall, causing serious injury, and damage to the product.
;The heat sink must not be blocked or covered. This product should not be installed unless
proper ventilation is provided or manufacturer‘s instructions have been adhered to.
;Do not install the device near any heat sources.
;Do not expose the device to direct sun radiation.
;Do not install the device in rooms with high humidity.
;Do not try to insert anything into device openings.
;The device shall not be exposed to dripping or splashing and no objects lled with liquids shall
be placed on the device.
;Clean only with dry or slightly moistened cloth.
;Protect the power cord from being walked on,pinched or damaged in any other way. Pay
particular attention to plugs and the point where they exit the device.

BASIC INFORMATION 5
musikelectronic geithain GmbH RL 903BK
;Do not attempt to service this product yourself as opening or removing cover may expose you
to dangerous voltage or other hazards.
;Refer all servicing to qualied service personnel.

BASIC INFORMATION 6
musikelectronic geithain GmbH RL 903BK
4.3 Unboxing
The speakers are shipped in proper condition. Unpack the speaker carefully and check for visible
damages. In case of damages report them to your retailer. Keep the packaging, in case the speaker
has to be transported in the future.
4.4 Delivery contents
;Speaker RL 903BK
;Amplier enclosure
;Speakon cable
;Mains cable
;Technical description and user manual
4.5 Cleaning
The speaker is made of real wood veneer and needs to be nurtured in the same way as furnishings.
We advise quality wax polish to ensure durability of the veneer. Surfaces can also be cleaned with
tidy, slightly damped, fuzz-free, smooth cloth.
4.6 Environmental conditions
Ensure the following environmental conditions in your listening room:
;Operating temperature +15 °C ... +35 °C (+59 °F ... +95 °F)
;Storage temperature range −25 °C ... +45 °C (−13 °F ... +113 °F)
;Relative humidity 45 % ... 75 %
4.7 Guarantee acknowledgements
Opening the device by unauthorized personnel leads to all claims under guarantee expire. In case of
destruction by overload, misuse or outside inuences there are no claims under guarantee.

POSITIONING 7
musikelectronic geithain GmbH RL 903BK
5 Positioning
Our speakers do not impose special requirements neither in stereo nor in multichannel set-ups.
Nonetheless speaker positioning has inuence on listening impression because every room is
individually designed and furnished. The following advices are just guidelines that ease proper
positioning. In addition we offer a measurement service to take advantage of the capabilities of your
listening environment.
5.1 Positioning near walls
When speakers are installed near walls sound quality is physically affected. Every customary speaker
behaves as a punctual sonic source in the low frequency range, with sonic waves spherical radiated
without any constructional measures. Back wall reections are unavoidable.
b
b
;Minimum distance to wall b ≥ 20 cm (7.9″)

POSITIONING 8
musikelectronic geithain GmbH RL 903BK
5.2 Stereo operation
The optimum position of the speakers in your listening environment is the so-called stereo triangle
(see gure). The base distance between the speakers and the distance to the hearing zone form
an equilateral triangle (stereo triangle). A distance less than 1.5 m (4′11″) or more than 3 m (9′10″)
should be avoided. For precise,spacial reproduction turn the speakers inside,directed to the hearing
zone.
a
a a
hearing zone
60°
;Distance between speakers and your listening position a = 1.5 m … 3 m (4′11″ … 9′10″)
;Adjust the speaker horizontally to the height of the ear at the listening position