Lab.gruppen LAB 300 User Manual
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Lab.gruppen LAB 300 User Manual

Lab.gruppen LAB 300 User Manual

Lab.gruppen lab 300: user guide
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Table of Contents

USER MANUAL HEADLINES
Unpacking 2
Warnings
2
User responsibility 2
1. Speaker damage
2. Speaker output hazard.
3. Radio interference.
Introduction
1. Front panel
2. Rear panel
Installation
1. Mounting
2. Cooling
3. Operating voltage
4. Grounding
5. Power consumption
6. Input connections
7. Connecting speakers
Operation modes
1. Stereo
2. Tandem mono
3. Bridged mono
4. Stereo reverse
Operation
1. Operation precautions
2.
Input attenuators
3. Gain switch
4. Indicators
Protections
1.
Clip-limiter
2. Thermal protection
3. VHF protection
4. Short circuit protection
5. D.C. protection

USER MANUAL

3
4
6
7
8
LAB 300
Design features
•
Safety approvals
•
EMC approvals
Specifications
•
EMC-declaration
Appendix A
•
Mains voltage selection
Troubleshooting
Warranty and disclaimers
•
General
•
International
Technical assistance and services 11
•
International
•
Factory services
9
9
10
10
11
1

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Summary of Contents for Lab.gruppen LAB 300

  • Page 1: User Manual

    1. Operation precautions Input attenuators 3. Gain switch 4. Indicators Protections Clip-limiter 2. Thermal protection 3. VHF protection 4. Short circuit protection 5. D.C. protection LAB 300 USER MANUAL Design features • Safety approvals • EMC approvals Specifications • EMC-declaration Appendix A •...

  • Page 2: User Responsibility

    Unpacking 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.

  • Page 3: The Front Panel

    Introduction 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 yourself with the amplifier. The front panel Figure 1. Front panel...
  • Page 4 Please refer to diagram on page 3 Speaker connector This type of speaker connector may be unfamiliar to some users. A full description is found in the operation section. (See page 6). AC line cord (See page 5). Clip limiter switch Turns the clip limiter on and off.
  • Page 5 At last, the "normal operating power", as measured according to the safety standard IEC 65 MAX OUTPUT POWER LAB 300 8 ohms 4 ohms 2 ohms note 1 Mean power with music as program source The amplifier driven to clip level Table 1.

  • Page 6: Operation Modes

    Figure 6. Balanced line To connect an unbalanced source, tie pin 3 (ring on TRS jack) down to the shield of the connector. If you leave one pin disconnected, you will lose 6 dB in gain. Figure 7. Unbalanced line connection A more optimal method for handling unbalanced sources is shown in Figure 8.

  • Page 7: Operation

    of the -1 (negative) pins of the Speakons. Do not connect speakers to channel A or B in the normal manner in bridge mode, as this can cause serious damage. Figure 10. Bridge mono connection The recommended minimum nominal impedance for bridged mono is 4 ohms (equivalent to driving both channels at 2 ohms).

  • Page 8: Design Features

    The LAB 300 is equipped with LAB.GRUPPEN’s Adaptive limiting system (ALS circuit continuously monitors the supply rails, and limits the current going to the output transistors. If...

  • Page 9: Emc-Declaration

    The equipment should be able to handle three different types of interference: • Electrostatic discharges up to 8 kV, hitting the chassis or cables. • Transients and bursts up to 1 kV, conducted through the cables to the unit. • Electromagnetic fields up to 3 V/m, radiated on the unit and the cables in the frequency range of 27 - 500 MHz.

  • Page 10: Appendix A Mains Voltage Selection

    AC option available. To check if the amplifier is equipped with this option, please follow these steps: 1. Make sure that the LAB 300 is unplugged from the mains voltage. 2. Remove the top cover. 3. Locate the terminal block for the mains cable.

  • Page 11: Warranty And Disclaimers

    Technical assistance and services • International If your LAB.GRUPPEN product needs repair, contact your LAB.GRUPPEN dealer or distributor, or contact LAB.GRUPPEN by fax, to obtain the location of the nearest authorised service centre. • Factory services In the event that your LAB.GRUPPEN product...

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