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Lab.gruppen LAB 300 User Manual

Lab.gruppen LAB 300
11 pages
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USER MANUAL HEADLINES
Unpacking 2
Warnings 2
User responsibility 2
1. Speaker damage
2. Speaker output hazard.
3. Radio interference.
Introduction 3
1. Front panel
2. Rear panel
Installation 4
1. Mounting
2. Cooling
3. Operating voltage
4. Grounding
5. Power consumption
6. Input connections
7. Connecting speakers
Operation modes 6
1. Stereo
2. Tandem mono
3. Bridged mono
4. Stereo reverse
Operation 7
1. Operation precautions
2. Input attenuators
3. Gain switch
4. Indicators
Protections 8
1. Clip-limiter
2. Thermal protection
3. VHF protection
4. Short circuit protection
5. D.C. protection
LAB 300
USER MANUAL
Design features 9
Safety approvals
EMC approvals
Specifications 9
EMC-declaration
Appendix A 10
Mains voltage selection
Troubleshooting 10
Warranty and disclaimers 11
General
International
Technical assistance and services 11
International
Factory services
1

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Lab.gruppen LAB 300 Specifications

General IconGeneral
Channels2
Total Harmonic Distortion<0.1%
Input Sensitivity1.4 V
Input Impedance (balanced)20 kΩ
Input Impedance (unbalanced)10 kΩ
Damping Factor>200
Signal to Noise Ratio>100 dB
Voltage Gain32 dB
Height88 mm (3.5 in)
Weight12 kg

Summary

Unpacking

Warnings

User Responsibility

Speaker Damage

Amplifier power can damage loudspeakers; check speaker capabilities.

Speaker Output Hazard

Avoid electrical shock by not touching exposed speaker wiring while operating.

Radio Interference

Product complies with EMC directive but may cause interference; user can take corrective steps.

Introduction

Installation

Mounting

Amplifier is rack unit high (1U) and mounts in EIA 19 inch rack; may be stacked.

Cooling

Heat sink sensing circuit mutes hot channel; power supply mutes both channels if overheated.

Operating Voltage

Connect power cable only to the AC source indicated on the amplifier's label.

Grounding

No ground lift switch; signal ground is floating via resistor to chassis for safety.

Power Consumption

Three ways to determine power/current consumption; peak current, average current, and normal operating power.

Input Connections

XLR and TRS jacks for input signals and linking; balanced wiring according to IEC 268.

Connecting Speakers

Uses Neutrik NL4FC Speakon connectors; proper wiring and polarity are essential.

Operation Modes

Stereo Operation

Dual channel, independent operation; level attenuators control respective levels.

Tandem Mono

Dual channel, single input operation; Link switch depressed to drive both channels.

Bridged Mono

Depress Link and Phase reverse switches; connect speaker leads to pin +1 and -1 of respective channels.

Stereo Reverse

Similar to Tandem mono but with Phase reverse switch depressed; channels operate in opposite polarity.

Operation

Operation Precautions

Ensure power is off for connections, AC mains is correct, switches are set properly, and turn gain down during power up.

Input Attenuators

Front panel controls to alter signal level for respective amplifier channel; calibrated in dB.

Gain Switch

Rear panel switch for changing input sensitivity; options for 23dB and 0dB/0.775mV.

Indicators

Front panel LEDs indicating output voltage, clipping, protection status, and signal presence.

Protection Features

Clip Limiter

Prevents dangerous clip signals reaching speakers; limiter can be turned on/off.

Thermal Protection

Protects amplifier from overheating; mutes input signal when heat sinks reach above 90°C.

VHF Protection

Mutes input signal if signals above 20kHz are present at output for more than five seconds.

Short Circuit Protection

Protects output devices from short circuits; affected channel may go into thermal protection.

D.C. Protection

Features fuses and crowbar protection to detect and protect against DC levels of 10 volts or more.

Design Features

Safety Approvals

Designed to meet IEC65 stringent electrical safety approval, recognized worldwide.

EMC Approvals

EMC stands for Electro Magnetic Compatibility; equipment should have low emission and immunity.

Specifications

EMC Declaration

Audio power amplifier conforms with EMC-directive 89/336/EEC and related standards.

Appendix A

Mains Voltage Selection

Guide for changing amplifier's mains voltage from 230V to 115V or vice-versa.

Troubleshooting

No Output

Check Speakon connection, VHF protection, and input signal.

Thermal Protection at Low Level

Check loudspeaker for short circuits in windings that occur when the coil gets warm.

Protect with Power Indicators Off

Verify AC line voltage is within operating range; check for over/under-voltage protection.

No Response After Checks

If fault persists, return amplifier to supplier or an approved service centre.

Warranty and Disclaimers

General Warranty

One-year warranty against defects in components and workmanship under normal use.

International Warranty

Contact supplier for warranty information; rights and disclaimers may vary by country.

Technical Assistance and Services

International Assistance

Contact dealer/distributor or fax for nearest authorized service centre location.

Factory Services

Contact service department for return instructions and Return Authorisation number.

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