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CONTENTS ....................................................................................................................................... |
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2 |
APPROVALS..................................................................................................................................... |
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2 |
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3 |
WARNINGS ...................................................................................................................................... |
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2 |
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3.1 |
Explanation of graphical symbols |
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2 |
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3.2 |
WARNING................................................................................................................................. |
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2 |
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3.3 |
CAUTION .................................................................................................................................. |
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2 |
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3.4 |
Important Safety Instructions ..................................................................................................... |
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2 |
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3.5 |
User responsibility...................................................................................................................... |
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3 |
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3.5.1 |
Speaker damage.................................................................................................................. |
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3 |
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3.5.2 |
Speaker output hazard ........................................................................................................ |
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3 |
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3.5.3 |
Radio interference .............................................................................................................. |
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3 |
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4 |
INTRODUCTION.............................................................................................................................. |
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4 |
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4.1 |
Unpacking .................................................................................................................................. |
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4 |
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4.2 |
Front Panel ................................................................................................................................. |
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4 |
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4.3 |
Rear Panel................................................................................................................................... |
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5 |
5 |
REAR PANEL FEATURES .............................................................................................................. |
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6 |
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5.1 |
Gain switch................................................................................................................................. |
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6 |
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5.1.1 |
The DIP-switch................................................................................................................... |
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6 |
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5.1.2 |
Sensitivity............................................................................................................................... |
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5.1.3 |
Options ............................................................................................................................... |
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5.2 |
Link switch ................................................................................................................................. |
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5.3 |
Operation modes......................................................................................................................... |
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5.3.1 |
Stereo mode............................................................................................................................ |
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5.3.2 |
Note for bench test ............................................................................................................. |
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7 |
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5.3.3 |
Tandem mode |
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5.3.4 |
Bridge mono mode ............................................................................................................. |
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5.3.5 |
Bridge mono mode features................................................................................................ |
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8 |
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5.4 |
Impedance matching (MLS switch) ........................................................................................... |
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8 |
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5.4.1 |
A practical way to find your .....................................................................MLSTM settings |
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5.4.2 |
MLS technology – the background .................................................................................. |
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10 |
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5.4.3 |
The problem ..................................................................................................................... |
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10 |
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5.4.4 |
The solution...................................................................................................................... |
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10 |
6 |
INSTALLATION............................................................................................................................. |
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10 |
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6.1 |
Mounting .................................................................................................................................. |
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10 |
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6.2 |
Cooling ..................................................................................................................................... |
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10 |
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6.3 |
Operating voltage ..................................................................................................................... |
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11 |
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6.4 |
Grounding................................................................................................................................. |
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11 |
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6.5 |
Power consumption .................................................................................................................. |
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11 |
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6.5.1 |
Calculation........................................................................................................................ |
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CONNECTIONS.............................................................................................................................. |
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13 |
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7.1 |
Input connections ..................................................................................................................... |
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13 |
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7.1.1 |
Balanced inputs ................................................................................................................ |
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13 |
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7.1.2 |
Unbalanced inputs ............................................................................................................ |
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13 |
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7.2 |
Connecting speakers................................................................................................................. |
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14 |
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8 |
OPERATION ................................................................................................................................... |
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14 |
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8.1 |
Operation precautions............................................................................................................... |
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14 |
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8.2 |
Powering up – Soft start ........................................................................................................... |
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14 |
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8.3 |
Input attenuators ....................................................................................................................... |
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15 |
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8.4 |
Indicators.................................................................................................................................. |
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15 |
9 |
PROTECTION FEATURES............................................................................................................ |
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15 |
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9.1.1 |
Clip limiter ....................................................................................................................... |
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15 |
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9.1.2 |
Thermal protection ........................................................................................................... |
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16 |
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9.1.3 |
VHF protection................................................................................................................. |
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16 |
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9.1.4 |
Short circuit protection..................................................................................................... |
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16 |
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9.1.5 |
Automatic Fuse Saver, AFSTM ..............................................................................limiter |
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16 |
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i~ДKЦкмййЙе== = |
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9.1.6 AC mains voltage protection ............................................................................................ |
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9.1.7 |
The “AC” LED................................................................................................................. |
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9.1.8 |
DC protection ................................................................................................................... |
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10 |
MAINTENANCE......................................................................................................................... |
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10.1 |
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Troubleshooting........................................................................................................................ |
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SPECIFICATIONS ...................................................................................................................... |
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WARRANTY............................................................................................................................... |
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O= =^mmols^ip=
This equipment is tested and approved according to
the U.S. safety standard ANSI/ UL 6500 and Canadian
safety standard CSA E60065-00. ETL made the tests
and they are a Nationally Recognized Testing
Laboratory (NRTL).
The ETL Listed Mark is recognized by local inspectors and Authorities Having Jurisdiction (AHJs)
throughout North America and also in some areas of South America. ITS ETL SEMKO is a NRTL recognized by OSHA (Occupational Safety and Health Administration), the ETL Listed Mark is an accepted alternative to UL and, as such, inspectors and AHJs are required by law to recognize, acknowledge, and accept the mark as proof of product compliance. See more on ETL Web: www.etlsemko.com/S1OurMarks/index.htm
P= t^okfkdp=
PKN= bсйд~е~нбзе=зС=Цк~йЬбЕ~д=лугДздл=
The lightning symbol within a triangle is intended to alert the user to the
presence of un-insulated “dangerous voltage” within the amplifier’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to humans.
! The exclamation point within a triangle is intended to alert the user to presence of important operating and service instructions in
the literature accompanying the product.
PKO= t^okfkd==
To reduce risk of fire or electric shock, do not expose this apparatus to rain or moisture.
PKP= `^rqflk=
To reduce the risk of fire or electric shock, do not remove screws. No user-serviceable parts inside. Refer servicing to qualified service personnel.
PKQ= fгйзкн~ен=p~СЙну=fелнкмЕнбзел=
Before using your amplifier, be sure to carefully read the applicable items of these operating instructions and the safety suggestions
1.Keep this manual for future reference.
2.Heed all warnings.
3.Follow all instructions.
4.Do not use this unit near water. Do not spill water or other liquids into or on the unit. Do not operate the amplifier 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 amplifier near heat producing devices such as radiators, heat registers, stoves or other apparatus that produce heat.
i~ДKЦкмййЙе== = |
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8.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.
9.Connect only to AC power outlets rated 100-120V, 50-60Hz.
10.Do not use this amplifier if the power cord is broken or frayed. Protect the power cord from being walked upon or pinched particularly at the plugs and the point where it exits from the apparatus.
11.Only use accessories specified by the manufacturer.
!12. 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.
13.Unplug this apparatus during lightning storms or when unused for long periods of time.
14.Do not connect an amplifier output in parallel or series with any other amplifier’s output. Do not connect the amplifier output to any other voltage source, such as battery, mains source, or power supply, regardless of whether the amplifier is turned on or off.
15.Do not run the output of any amplifier back into another channel's input.
16.Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way such as:
•Power-supply cord or plug is damaged
•Liquid has been spilled into the unit
•An object has fallen into the unit
•The unit has been exposed to rain or moisture
•The unit does not operate normally
•The unit was dropped or the enclosure is damaged
17.Do not remove top or bottom covers. Removal of the cover will expose hazardous voltages. There are no serviceable parts inside and removal may void the warranty.
18.An experienced user shall always supervise this professional audio equipment, especially if inexperienced adults or minors are using the equipment.
PKR= rлЙк=кЙлйзелбДбдбну=
PKRKN= péÉ~âÉê=Ç~ã~ÖÉ=
!humans alike. Many loudspeakers can be easily damaged or destroyed by overpowering, especially with the high power available from a bridged amplifier. Always check the speakers’Your amplifier is very powerful and can be potentially dangerous to both, loudspeakers and
continuous and peak power capabilities.
Even if the amplifier’s front panel attenuators can be used to reduce the gain, it is still possible to reach full output power if the input signal level is high enough.
PKRKO= pйЙ~вЙк=змнймн=Ь~т~кЗ=
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. See page 14 about outputs for proper connection of speakers.
PKRKP= o~Збз=бенЙкСЙкЙеЕЙ=
This equipment has been tested and found to comply with the limits for a Class B 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 does cause harmful interference to radio or television reception, which can be determined by turning the equipment on and off, the user is encouraged to try to correct the interference by one or more of the following measures:
•Reorient or relocate the antenna.
•Increase the separation between the equipment and receiver.
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•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
Q= fkqolar`qflk=
Thank you for purchasing a Lab.gruppen power amplifier. This manual contains important information on operating your amplifier correctly and safely. Please take some time and read this manual to familiarize you with the advanced features of this amplifier.
QKN= rей~ЕвбеЦ=
Carefully open the shipping carton and check for any noticeable damage. Every Lab.gruppen amplifier is tested and inspected before leaving the factory and should arrive in perfect condition. If found to be damaged, notify the shipping company immediately. Only the consignee may institute a claim with the carrier for damage incurred during shipping. Be sure to save the carton and packing materials for the carrier's inspection.
It is also advisable to save the carton and packing material, even if the amplifier is undamaged. Should you ever need to ship the amplifier, always use the original packing.
QKO= |
cêçåí=m~åÉä= |
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VHF |
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AFS |
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TEMP |
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CLIP |
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AC |
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-5dB |
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-10dB |
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-15dB |
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CH.A |
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-20dB |
CH.B |
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-25dB |
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-12 |
-10 |
-7 |
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ON |
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-16 |
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-5 |
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-20 |
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-3 |
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-3 |
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-40 |
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-1 |
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-1 |
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-80 |
dB |
0 |
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0 |
CONVERTIBLE POWER AMPLIFIER |
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1 |
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2 |
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2 |
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7 |
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Figure 1: Front panel
1. Carry/protection handle
Both handles can be used to carry the amplifier; they also act as protection for the front panel. In permanent installations, or where rack front covers are too shallow they may be removed by unscrewing the retaining bolts behind the front panel.
2. Input level attenuators
These controls are used to alter the signal level entering the amplifier. They are calibrated in dB to assist the setup of active loudspeaker systems, or to cut down unwanted noise from the input signal. (See page 15)
3. Over temperature protect indicator
This indicator illuminates if the amplifier is going to operate above its maximum operating temperature (90°°C). The indicator first comes on as a warning to either turn down the input level or check the cooling arrangements. Beyond the maximum temperature the amplifier will mute the input signal. Once the cooling fans have brought the output heat sinks back to normal operating temperature the input signal is un-muted.
4. VHF protect indicator
This indicator illuminates if signals above 12 kHz are continuously present at full power at the output terminals. If this occurs the input signal is muted, and the process cycles until the VHF signal is no longer present. (See page 16)
5. Clip/limit indicator
This indicator signals if the amplifier output is clipping or limiting. It has two different indication states: If the clip limiter is engaged, it has a short time constant, and it illuminates briefly.
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If the clip limiter is not engaged, it has an increased time constant, and it illuminates for a longer period. (See page 15)
6. Fan grill filters
Two grilles with foam filters are located on the front panel to prevent dust from entering the amplifier. For easy cleaning of the filters the grilles are removable by simply pulling them off. The foam filters should always be used.
7. Power switch
Turns mains power on or off. (See page 11 and 14)
8. AC indicator
Indicates if AC voltage is present. Note: Electrically this indicator is located in front of the power switch.
9. AFS indicator
Indicates if the AFSTM (Automatic Fuse Saver) current limiter is activated.
QKP= oÉ~ê=m~åÉä=
Figure 2: Rear panel
1. Output / Speaker connector
The Speakon connector from Neutrik® may be unfamiliar to some users. A full description can be found in the “Connections” section. (See page 14)
2. Minimum load selector (MLS™) switch
These switches are used to select the maximum output power. (See page 8)
3. Clip limiter switch
Turns the clip limiter on or off. (See page 15)
4. Input signal XLR.
Neutrik® Combojack features also ¼” TRS phone jacks. (Pin 2 is “hot”, see page 13)
5. Link output
XLR male connector connected in parallel to the female for linking the channel to another input.
6. Gain switch channel B
Three of the switches in the DIP switch selects the maximum gain of the channel to be either 20, 23, 26, 29, 32, 35, 38 or 41dB. (See page 6)
7. Link/Bridge switch
Two of the switches in the DIP switch are used for Link and Bridge operation. (See page 6)
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