musikelectronic geithain RL 904 User manual

musikelectronic geithain
RL 904
Instructions for installation and use

TABLE OF CONTENTS II
musikelectronic geithain GmbH RL 904
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 Mains connection 10
6.2 Cable connection 10
6.3 Adjustment controller 11
6.4 Status indication 11
7 Specications 12
8 Acoustic measurements 13
9 Notes 14

INTRODUCTION 1
musikelectronic geithain GmbH RL 904
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 904
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 904
3 System description
The RL 904 is an all purpose main loudspeaker for middle sized or smaller audio-, video- and
lm production studios. The coaxial conguration of the driver units delivers a sound stage with
outstanding authenticity and consistency of imaging. With the directivity index optimized for mid-
distance monitoring, an excellent stage depth with smallest possible coloration is achieved. Non-
linear distortion remains small even at high sound pressure levels. The bass reex system obtains a
low-frequency cut-off at 40 Hz and provides a high degree of sound accuracy. We designed the whole
system to achieve an optimum group delay.
The two channel amplier with an electronic crossover is integrated into the back of the enclosure
and is hinged for service purposes. An intermittent ashing LED indicates when the level reaches
the system overload threshold. If the maximum level is exceeded continuously, the output level is
attenuated by 20dB to protect the components from damage. Two gapless variable low frequency
controls provide separate adjustment of two frequency bands to enable the frequency response to
be matched to the acoustic environment of the listening room.
A variety of special stands and racks are available as accessories. According xing elements are
integrated into the loudspeaker cabinet.

BASIC INFORMATION 4
musikelectronic geithain GmbH RL 904
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 904
;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 904
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 904
;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 904
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.
For optimum listening experience a minimum distance of 50 cm (19.7″) to walls and furniture should
be ensured. Avoid corner installations because unwanted bass accentuation could arise.
b
b
;Minimum distance to wall b ≥ 50 cm (19.7″)

POSITIONING 8
musikelectronic geithain GmbH RL 904
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 2.5 m (8′2″)
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 … 2.5 m (4′11″ … 8′2″)
;Adjust the speaker horizontally to the height of the ear at the listening position

POSITIONING 9
musikelectronic geithain GmbH RL 904
5.3 Surround operation
In surround operation the stereo triangle (see Stereo operation) is extended to a circle. The hearing
zone is the centre of this circle. Position all speakers in the same distance to the hearing zone. The
centre speaker is positioned in the middle between both front speakers. Pay attention to positioning
the front and rear speakers horizontally along one plane. The angle between centre and rear speakers
should be about 110° – 120°.
;Distance between speakers and your listening position a = 1.5 m … 2.5 m (4′11″ … 8′2″)
In case installation in the prescribed way is not possible in your listening room most decoding
devices allow adjustments of single speakers.
60°
110° ... 120°
a
a
a
aa
hearing zone

SET-UP THE SPEAKERS 10
musikelectronic geithain GmbH RL 904
6 Set-up the speakers
In this chapter we inform you how to connect your speakers to mains and your signal source. Ensure
that the mains switch on the backside is in position “OFF”. Only when your speaker is completely
connected (see chapters 6.1 and 6.2) you can take the device into operation by use of the mains
switch.
The speaker can be connected to every common pre-amplier (Ua= 1 V ... 5 V; Ri < 600 Ω).
6.1 Mains connection
Before start-up check the mains voltage stated on the backside of the device. If your local mains
voltage does not match the specication of the speaker,please refer to your retailer or direct
distribution. When the stated and your local mains voltage comply connect the mains connector of
the speaker to the socket with the included mains cable.
6.2 Cable connection
The input of the integrated amplier is electrically balanced. When your signal source also utilizes
balanced connectors, please use a cable wired as stated in the table:
Balanced connector
(amplier)
Balanced connector
(signalsource)
Unbalanced connector
(signalsource)
XLR XLR RCA
Earth Pin 1 Pin 1 Ring
Signal + Pin 2 Pin 2 Tip
Signal - Pin 3 Pin 3 Ring
When using a signal source with unbalanced outputs (RCA) you need to balance the connecting
cables. This avoids hum and other noise interferences. The table and the following gure show the
wiring.
Unbalanced RCA to balanced XLR Connections
Loudspeaker (XLR-3M) Cable Source (RCA)
1 2
3

SET-UP THE SPEAKERS 11
musikelectronic geithain GmbH RL 904
6.3 Adjustment controller
The “Level” controller is used for level adjustment over the full frequency range.
6.4 Status indication
The two-coloured LED at the front of the speaker is used as status indicator of the device.
;LED green: indicates normal operation of the device
;LED red: indicates the operation of the overload protection circuit;
Output power limitation to protect the components from overloading

SPECIFICATIONS 12
musikelectronic geithain GmbH RL 904
7 Specications
General Active 2-way monitor for use in small and middle audio-, video produc-
tion studios, in mobile broadcast vans, and for multi-channel and near-
eld purposes 1.5 m (4′11″) and 2.5 m (8′2″)
Maximum SPL
from 100Hz ... 6 kHz 106 dB ... 112 dB / r = 1 m (3′3″) (4 π)
Bandwidth 40 Hz ... 20 kHz ±3 dB
Calibration:
Acoustic output level / PE= −14 dBu 83 dB / r = 1 m (3′3″)
Directivity index
from 100Hz ... 10 kHz increasing from 1dB to 8 dB
Inherent noise sound level ≤ 7dB (A) / r = 1 m (3′3″)
Total harmonic distortion
measured at 96dBSPL / r = 1 m (3′3″)
from 100Hz ... 10 kHz ≤ −40 dB
Nominal input level +6 dBu (adjustable)
Input impedance ≥ 10 kΩRC balanced
Electronic crossover frequency 2.5 kHz
Nominal output power of the amplier
LF
HF
150 W / 4 Ω
100 W / 4 Ω
Input connector XLR 3F
Drive units
Woofer
Tweeter
1× 160 mm (6.5″) cone
1× 25 mm (1″) dome
Operation and clipping indicator LED on front
Power requirements 230 V ~ ±10 %, 50Hz ... 60 Hz
115 V ~ ±10 %, 50Hz ... 60 Hz (optional)
100 V ~ ±10 %, 50Hz ... 60 Hz (optional)
Power consumption 20 VA when idle
max. 160 VA at full load
Mains connection IEC power connector
Environmental conditions
for use
for storage
humidity
+15°C ... +35°C (+ 59°F ... +95 °F)
−25 °C ... +45 °C (−13 °F ... +113 °F)
45 % ... 75 %
Dimensions (H × W × D) 398 mm × 254 mm × 345 mm (15.7″ × 10″ × 13.6″)
Weight 16 kg (35.3 lbs)
Design of the cabinet MDF wood in ash black veneered; different veneers and colours on
request
Lateral mounting with lateral mounting; without lateral mounting on request

ACOUSTIC MEASUREMENTS 13
musikelectronic geithain GmbH RL 904
8 Acoustic measurements
All acoustic measurements are carried out under anechoic conditions with 1 m (3′3″) distance.
1
0.5
0
[%]
K2 K3
[Hz]
Total harmonic distortions PA= 90 dB
20 50 100 200 500 1k 2k 5k 10k 20k
85
80
75
70
65
60
[dB]
[Hz]
Free field frequency response 0° 45°h
100 200 500 1k 2k 5k 10k

NOTES 14
musikelectronic geithain GmbH RL 904
9 Notes

NOTES 15
musikelectronic geithain GmbH RL 904

NOTES 16
musikelectronic geithain GmbH RL 904

NOTES 17
musikelectronic geithain GmbH RL 904

musikelectronic geithain gmbh
STUDIO MONITORING - HIGHEND LOUDSPEAKER - SOUND REINFORCEMENT
SYSTEMS SYSTEMS
Nikolaistraße 7
04643 Geithain / Germany
Phone: [phone]
Fax: [phone]
Email: [email protected]
www.me-geithain.de
BDA_RL 904_25.05.2018_ENV17