E SERIES
Dedicated installation amplifiers
E 4:2E 8:2E 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 fit 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 specified 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 qualified 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 according 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 sufficient magnitude to constitute a risk of electric shock to humans.
The exclamation point triangle is used to alert the user to presence of important operating and service instructions in the literature accompanying the product.
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3. Warnings
3.1.1 Warning
To reduce risk of fire 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 filled 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.
3.1.2 Caution
To reduce the risk of fire or electric shock, do not remove screws. No user-serviceable parts inside. Refer servicing to qualified service personnel.
Français: Pour réduire le risque d’incendie ou de choc électrique, ne pas retirer les vis. Aucune pièce réparable par l’utilisateur. Confier l’entretien àpersonnel qualifié.
3.2 User responsibility
3.2.1 Mains connection grounding
Your amplifier must be connected to a grounded socket outlet.
3.2.2 Speaker output hazard
Power amplifiers are capable of producing hazardous output voltages. To avoid electrical shock, do not touch any exposed speaker wiring while the amplifier is operating. External wiring connected to the speaker terminals shall be installed by a qualified person, or ready-made leads or cords of appropriate capacity shall be used.
As the amplifier 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 fields, high voltage flashes, 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 amplifier’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 amplifier 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 fire 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............................................................................................................................................................. |
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4.1 |
Introduction.................................................................................................................................................... |
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4.2 |
Main features................................................................................................................................................. |
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4.2.1 Class D output stage and universal power supply with low current draw............................................... |
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4.2.2 Amplifier sensitivity / gain...................................................................................................................... |
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4.2.3 Protection and performance optimization.............................................................................................. |
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4.2.4 50 Hz high-pass filter............................................................................................................................ |
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4.2.5 APD / APO scheme (Auto Power Down / On)....................................................................................... |
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4.2.6 GPIO facilities....................................................................................................................................... |
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5. |
Installation........................................................................................................................................................ |
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5.1 Unpacking.................................................................................................................................................... |
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5.2 |
Mounting...................................................................................................................................................... |
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5.3 |
Cooling........................................................................................................................................................ |
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5.4 |
Operating voltage......................................................................................................................................... |
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5.5 |
Grounding.................................................................................................................................................... |
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6. |
Quick guide overview...................................................................................................................................... |
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6.1 |
Front panel.................................................................................................................................................. |
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6.1.1 Front panel LEDs................................................................................................................................ |
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6.2 |
Rear panel .................................................................................................................................................. |
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6.2.1 Power................................................................................................................................................. |
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6.2.2 Per-channel control and monitoring..................................................................................................... |
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6.3 |
Input signal present threshold........................................................................................................................ |
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Table of Contents
7. |
Operation and performance........................................................................................................................... |
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7.1 |
Introduction.................................................................................................................................................. |
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7.2 |
Operating performance................................................................................................................................. |
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7.3 |
Signal flow and headroom............................................................................................................................. |
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7.3.1 Signal flow blocks................................................................................................................................ |
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7.4 |
Audio input and output connections, setup and features.............................................................................. |
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7.4.1 Balanced / unbalanced input connection............................................................................................. |
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7.4.2 Output operation and connection......................................................................................................... |
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7.4.3 Output bridge mode and asymmetric loading...................................................................................... |
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7.4.4 Constant voltage 70 V systems setup operation.................................................................................. |
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7.4.5 Output Current Peak Limiter (CPL)...................................................................................................... |
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8. |
Appendix.......................................................................................................................................................... |
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8.1 |
Maintenance................................................................................................................................................ |
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8.2 |
Current draw and thermal dissipation............................................................................................................ |
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8.3 |
Asymmetric loading data.............................................................................................................................. |
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9. |
Techincal specifications................................................................................................................................. |
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10. |
Warranty........................................................................................................................................................... |
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11. |
Service............................................................................................................................................................. |
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6 E Series Operation Manual rev 1.0.0
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 Efficient Amplifier. 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 amplifiers. Please read through this manual in its entirety to become fully acquainted with configuration 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 amplifier 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 amplifier modes or loudspeaker system configuration.
Lab.gruppen E Series power amplifiers are designed and built specifically for the unique demands of permanent installation applications. By packing two channels of efficient reconfigurable power amplification into a 1U chassis, the E Series achieves a high power and channel density. The benefits include reduced rack space requirements and minimal heat build-up. The flexible output stages enable each amplifier 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 amplifier 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 amplifier models. Any references to “E Series” in this manual refer to all models in the range.
4.2 Main features
Your new E Series amplifier 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 amplifiers employ a unique Class D output stage that is ideally matched to the rated power output. To provide flexibility, each channel offers sufficient 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 Amplifier sensitivity / gain
For ease of use in system integration, E Series have been designed with a fixed 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 amplification is vital to any audio system. Inadequate or faulty power amplifiers could cause damage to loudspeakers, or in some cases to the power amplifiers themselves. To prevent damage or service interruptions, E Series amplifiers offer advanced features to protect both internal circuits and connected loads. These features include the mains current limiter that allows several amplifiers to be connected to a typical mains outlet.
Standard E Series protection features include:
•A CPL (Current Peak Limiter) ensures that the amplifier’s output does not exceed the safe current handling parameters of the amplifier components.
•Temperature protection ensures that the amplifier will not be damaged by exceeding thermal limits. A TEMP indicator LED flashes when the amplifier 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 amplifier outputs. If such conditions occur an internal fuse opens.
Note! There is no open fuse indication on the amplifier. 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 amplifier 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 amplifier will remain operational. This limiting allows the amplifier 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 amplifiers are turned on simultaneously.
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5. Installation
4.2.4 50 Hz high-pass filter
Each channel has a switchable 50 Hz high-pass filter. In the default full-range position the amplifier has a flat response with a -3 dB point at 2 Hz. When engaged, the filter rolls off low frequencies (12 dB/octave) for greater efficiency and reliability in, for example, 70 V high-impedance systems where the removal of very low frequency content may be desired. The filter 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 amplifiers 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 amplifiers 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 amplifier is either in standby or protective mute is activated in one or both channels.
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