LAB.GRUPPEN E 4:2E, E 8:2E Operation Manual
E SERIES
Dedicated installation amplifiers
▸ E 4:2
▸ E 8:2
▸ E 12:2
Operation Manual
1. Important safety instructions
1. Important safety instructions
Before using your E Series, be sure to carefully read the applicable items of this Operation Manual and the Safety
Instructions.
1. Keep this manual for future reference.
2. Heed all warnings. Follow all instructions.
3. Do not use this unit near water.
4. Do not spill water or other liquids into or on the unit. Do not operate
the unit while wet or standing in liquid.
5. Clean only with dry cloth.
6. Do not block the air intake or exhaust ports. Install the unit in
accordance with the instructions.
7. Do not operate the unit near heat producing devices such as
radiators, heat registers, stoves or other apparatus that produces
heat. Always operate the unit with the chassis ground wire
connected to the electrical safety earth. Do not defeat the safety
purpose of a grounding-type plug. A grounding-type plug has
two pins and a third grounding prong. The third prong is provided
for your safety. If the provided plug does not t into your outlet,
consult an electrician for replacement of the obsolete outlet.
8. Connect only to AC power outlets rated 100 -240 V, 50 - 60 Hz.
9. Do not use this unit if the power cord is broken or frayed. Protect
the power cord from being walked upon or pinched, particularly
at the plug and the point where it exits from the apparatus. Only
use accessories specied by the manufacturer.
10. The unit is intended to use in a 19” rack. Follow the mounting
instructions. When a rack on wheels is used, use caution when
moving the loaded rack to avoid injury from tipping over. Unplug
this apparatus during lightning storms or when unused for long
periods of time.
11. Do not connect the unit’s outputs in parallel or series with any other
unit’s output. Do not connect the unit’s output to any other voltage
source, such as battery, mains source, or power supply, regardless
of whether the unit is turned on or off.
12. Do not run any of the unit’s outputs back into another channel’s
input.
13. Refer all servicing to qualied service personnel. Servicing is re
quired when the apparatus has been damaged in any way
such as:
a. Power-supply cord or plug is damaged.
b. Liquid has been spilled into the unit.
c. An object has fallen into the unit.
d. The unit has been exposed to rain or moisture.
e. The unit does not operate normally.
f. The unit was dropped or the chassis is damaged.
14. Do not remove top or bottom covers. Removal of the covers will
expose hazardous voltages. There are no user serviceable parts
inside and removal may void the warranty.
15. An experienced user shall always supervise this professional
audio equipment, especially if inexperienced adults or minors are
using the equipment.
16. The mains plug is used as the disconnect device and shall remain
readily accessible. If the mains plug is not readily accessible due to
mounting in a 19” rack, then the mains plug for the entire rack must
be readily accessible.
2. Approvals
This equipment conforms to the requirements
of the EMC Directive 2004/108/EC and the
requirements of the Low Voltage Directive
2006/95/EC.
Standards applied: EMC Emission
EN55103-1, E3
EMC Immunity EN55103-2, E3, with S/N
below 1% at normal operation level.
Electrical Safety EN60065, Class I
This equipment is tested and listed accord ing
to the U.S. safety standard ANSI/ UL 60065
and Canadian safety standard CSA C22.2
NO. 60065. UL made the tests and they
are a Nationally Recognized Testing
Laboratory (NRTL).
This equipment is tested and found to comply
with the limits of a Class A device in part 15B of
the FCC rules. UL made these tests.
3. Warnings
3.1 Explanation of Graphical Symbols
The lightning bolt triangle is used to
alert the user to the presence of
un-insulated “dangerous voltages”
within the unit’s chassis that may be
of sufcient magnitude to constitute a
risk of electric shock to humans.
The exclamation point triangle is used to
alert the user to presence of impor tant
operating and service instructions in the
literature accompanying the product.
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3.1.1 Wa r ning
To reduce risk of re or electric shock, do not expose this apparatus to rain or moisture.
Do not expose this system/apparatus to dripping or splashing and ensure that no objects lled with liquids are placed on
the apparatus.
L’appareil ne doit pas être exposé à des egouttements d’eau ou des éclaboussures et de plus qu’aucun objet rempli de
liquide tel que des vases ne doit pas être placé sur l’appareil.
This apparatus must be connected to a mains socket outlet with a protective earthing (ground) connection.
Cet appareil doi t être raccordé á une prise de courant qui est branchée à la terre.
The mains plug is used as a disconnect device and shall remain readily operable.
Lorsque la prise du réseau d’alimentation est utilisés comme dispositif de déconnexion, ce dispositif doit demeuré
aisément accessible.
3. Warnings
3.1.2 Caution
To reduce the risk of re or electric shock, do not remove screws. No user-serviceable parts inside. Refer servicing to
qualied service personnel.
Français: Pour réduire le risque d’incendie ou de choc électrique, ne pas retirer les vis. Aucune pièce réparable par
l’utilisateur. Coner l’entretien àpersonnel qualié.
3.2 User responsibility
3.2.1 Mains connection grounding
Your amplier must be connected to a grounded socket outlet.
3.2.2 Speaker output hazard
Power ampliers are capable of producing hazardous output voltages. To avoid electrical shock, do not touch any
exposed speaker wiring while the amplier is operating. External wiring connected to the speaker terminals shall be
installed by a qualied person, or ready-made leads or cords of appropriate capacity shall be used.
As the amplier outputs produce high voltage, do not connect or disconnect speaker cables when the mains power
is on.
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3. Warnings
3.2.3 Radio interference
A sample of this product has been tested and complies with the limits for the European Electro Magnetic
Compatibility (EMC) directive. It also has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference from electrical equipment. This product uses radio frequency energy
and, if not used or installed in accordance with these operating instructions, may cause interference to other
equipment, such as radio receivers. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment causes harmful interference to radio or television reception (determined
by turning the equipment on and off), the user may be able to correct the interference by one or more of the
following measures:
• Check if the affected unit complies with the EMC limits for immunity, (CE-labeled). If not, address the problem
with the manufacturer or supplier. All electrical products sold in the EC must be approved for immunity
against electromagnetic elds, high voltage ashes, and radio interference.
• Consult the dealer or an experienced radio/TV technician for help.
• Reorient or relocate the antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
3.2.4 Speaker damage
Many loudspeakers can be easily damaged or destroyed by overpowering them. Always check the speaker’s
continuous and peak power capabilities. Although the amplier’s attenuators can be used to reduce the overall
gain, an increase of the input signal can still result in full output power, which may cause damage to connected
speakers.
All E Series amplier are shipped with limiters set in “Lo-Z” mode. All models also support a “70 V” mode with
peak output voltage of 100 V peak. Users must verify that connected loudspeakers can handle full output before
changing the limiter setting; the “70 V” mode translates to very high instantaneous peak power when connected
to a low impedance loudspeaker (e.g. up to 2500 W peak into 4 ohms).
3.2.5 Maintenance
For safe and reliable operation, any dust collected in the front panel should be removed regularly. In rare
circumstances, accumulated dust could ignite due to high internal temperatures and a re occur. If the front
is clogged so that air cannot pass, then the unit will eventually go into thermal protection, any resultant
problems will not be covered by the warranty.
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Table of Contents
Table of Contents
4. Welcome............................................................................................................................................................. 7
4.1 Introduction....................................................................................................................................................7
4.2 Main features................................................................................................................................................. 7
4.2.1 Class D output stage and universal power supply with low current draw............................................... 7
4.2.2 Amplier sensitivity / gain...................................................................................................................... 8
4.2.3 Protection and performance optimization..............................................................................................8
4.2.4 50 Hz high-pass lter............................................................................................................................ 9
4.2.5 APD / APO scheme (Auto Power Down / On)....................................................................................... 9
4.2.6 GPIO facilities....................................................................................................................................... 9
5. Installation........................................................................................................................................................10
5.1 Unpacking....................................................................................................................................................10
5.2 Mounting......................................................................................................................................................10
5.3 Cooling........................................................................................................................................................10
5.4 Operating voltage.........................................................................................................................................11
5.5 Grounding....................................................................................................................................................11
6. Quick guide overview...................................................................................................................................... 12
6.1 Front panel..................................................................................................................................................12
6.1.1 Front panel LEDs................................................................................................................................12
6.2 Rear panel ..................................................................................................................................................13
6.2.1 Power.................................................................................................................................................13
6.2.2 Per-channel control and monitoring.....................................................................................................14
6.3 Input signal present threshold........................................................................................................................15
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Table of Contents
7. Operation and performance........................................................................................................................... 15
7.1 Introduction..................................................................................................................................................15
7.2 Operating performance.................................................................................................................................15
7.3 Signal ow and headroom.............................................................................................................................15
7.3.1 Signal ow blocks................................................................................................................................16
7.4 Audio input and output connections, setup and features..............................................................................16
7.4.1 Balanced / unbalanced input connection.............................................................................................16
7.4.2 Output operation and connection.........................................................................................................17
7.4.3 Output bridge mode and asymmetric loading......................................................................................17
7.4.4 Constant voltage 70 V systems setup operation..................................................................................18
7.4.5 Output Current Peak Limiter (CPL)......................................................................................................19
8. Appendix..........................................................................................................................................................19
8.1 Maintenance................................................................................................................................................19
8.2 Current draw and thermal dissipation............................................................................................................19
8.3 Asymmetric loading data..............................................................................................................................19
9. Techincal specications................................................................................................................................. 23
10. Warranty........................................................................................................................................................... 24
11. Service............................................................................................................................................................. 24
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4. Welcome
4. Welcome
4.1 Introduction
Thank you for choosing a Lab.gruppen E Series product built around Lab.gruppen’s IDEEA, the IntelliDrive
Energy Efcient Amplier. This manual provides a comprehensive guide to the features and functionality of
E Series model E 12:2, E 8:2 and E 4:2 ampliers. Please read through this manual in its entirety to become fully
acquainted with conguration options and protection circuitry.
To facilitate timely installation and use of this E Series product, we have included a Quick Guide Overview
(section 6). This brief summary, in conjunction with Installation (section 5), contains the basic information
needed to safely install the amplier and place it in service. However, we highly recommend reading through
this manual in its entirety, beginning with Main Features and Technologies and continuing through Operation
and Performance. As you become thoroughly familiar with all aspects of operation, you may learn of features
or options that will affect your choices on amplier modes or loudspeaker system conguration.
Lab.gruppen E Series power ampliers are designed and built specically for the unique demands of permanent
installation applications. By packing two channels of efcient recongurable power amplication into a 1U
chassis, the E Series achieves a high power and channel density. The benets include reduced rack space
requirements and minimal heat build-up. The exible output stages enable each amplier channel to be set
for either low impedance or “70 V”-constant voltage (70.7 Vrms = 100 V peak) mode.
Although E Series features and facilities are tailored for installation applications, each amplier draws on the
foundational engineering that has made Lab.gruppen the benchmark of quality for touring concert systems:
exceptional sonic performance, rugged construction, proven reliability, and protection features that anticipate
every unwelcome possibility.
This manual was created for the E Series E 12:2, E 8:2 and E 4:2 amplier models. Any references to “E Series”
in this manual refer to all models in the range.
4.2 Main features
Your new E Series amplier incorporates a number of sophisticated technologies – many of them proprietary to
Lab.gruppen – that ensure the best possible performance and years of reliable operation. Familiarizing yourself
with these technologies will prove invaluable in setting up and optimizing your loudspeaker system.
4.2.1 Class D output stage and universal power supply with low current draw
All E Series ampliers employ a unique Class D output stage that is ideally matched to the rated power output.
To provide exibility, each channel offers sufcient voltage swing and current capacity to drive either constant
voltage (“70 V”) or low impedance (2/4/8 or 16 ohms). In order to have low thermal losses as well as the voltage
swing required to drive 70 V, the design is based on a permanently bridged output.
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4. Welcome
4.2.2 Amplier sensitivity / gain
For ease of use in system integration, E Series have been designed with a xed sensitivity of 4 dBu. Each model
offers two operational modes individually selectable per channel:
* “70 V” – Optimized for constant voltage systems but also can be used when load impedance is 8 ohms or
higher. Input signal of 4 dBu produces 70.7 Vrms output, for gain of 35.2 dB.
* “Lo-Z” – Optimized for driving loads with impedance below 16 ohms. Input signal of 4 dBu produces the rated
burst power into 4 ohms; gain varies by model.
4.2.3 Protection and performance optimization
Appropriate and reliable power amplication is vital to any audio system. Inadequate or faulty power ampliers
could cause damage to loudspeakers, or in some cases to the power ampliers themselves. To prevent
damage or service interruptions, E Series ampliers offer advanced features to protect both internal circuits
and connected loads. These features include the mains current limiter that allows several ampliers to be
connected to a typical mains outlet.
Standard E Series protection features include:
• A CPL (Current Peak Limiter) ensures that the amplier’s output does not exceed the safe current handling
parameters of the amplier components.
• Temperature protection ensures that the amplier will not be damaged by exceeding thermal limits. A TEMP
indicator LED ashes when the amplier approaches thermal limits to allow user action before protective
muting engages.
• A PAL (Power Average Limiter) limits the maximum average power consumption from the mains.
• DC protection ensures destructive DC signals will not appear at the amplier outputs. If such conditions
occur an internal fuse opens.
Note! There is no open fuse indication on the amplier. If a channel indicates signal presence but
there is no sound, an open fuse could be the cause. If an internal fuse is blown, then the amplier
needs service.
• Under Voltage Limit - A temporarily low mains voltage will indirectly initiate limiting if a high output level is
attempted. In most circumstances, depending on signal characteristics and level, the amplier will remain
operational. This limiting allows the amplier to remain functional during sustained periods of
lower mains voltage, as well as during temporary dips and when very long mains cords are used.
• Low inrush current ensures that the mains breaker will not trip when several power ampliers are turned
on simultaneously.
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5. Installation
4.2.4 50 Hz high-pass lter
Each channel has a switchable 50 Hz high-pass lter. In the default full-range position the amplier has a at
response with a -3 dB point at 2 Hz. When engaged, the lter rolls off low frequencies (12 dB/octave) for greater
efciency and reliability in, for example, 70 V high-impedance systems where the removal of very low frequency
content may be desired. The lter can also be used if desired when the output channel is connected to low
impedance loudspeakers that are unable to reproduce deep bass frequencies.
4.2.5 Auto Power Down / On (APD / APO) scheme
To comply with Energy Star 2.1 requirements, all E Series ampliers incorporate an APD scheme with power
consumption below 1 W in sleep/standby mode. The E Series will go to standby mode after 20
minutes without input signal.
E Series also incorporates an APO functionality that restores full operation less than two seconds after signal is
applied to either of the inputs. Chapter 6.3 describes the threshold that is used.
4.2.6 General Purpose Input / Output (GPIO) facilities
The GPIO connections allow seamless interfacing with many third-party control and power sequencing systems.
Functions are optional; the ampliers will operate normally when GPIO is not connected.
The General Purpose Input (GPI) controls the power state via external contact closure as follows:
• It reacts to a transition from open to closed by forcing the unit to the on state. The APD function will still
apply, and the on state will be retained after a power cycle.
• It reacts to a transition from closed to open by forcing the unit to the standby state. This will also disable the
APO until it is turned on again.
The General Purpose Output (GPO) is an internal contact closure that, when closed, indicates the unit is on and
both channels functional (neither muted due to high temperature). Open indicates that the amplier is either in
standby or protective mute is activated in one or both channels.
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