USER MANUAL HEADLINES LAB 300 USER MANUAL Unpacking 2 Warnings 2 User responsibility 2 1. 2. 3. Introduction 1. 2. 9 4 Appendix A • Mains voltage selection 10 Troubleshooting 10 Warranty and disclaimers 11 • • 6 General International Technical assistance and services 11 • • International Factory services 7 Operation precautions Input attenuators Gain switch Indicators Protections 1. Clip-limiter 2. 3. 4. 5.
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. Be sure to save the carton and packing materials for the carrier's inspection.
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 1. Carry/protection handle Both handles can be used to carry the amplifier, they also act as protection for the front panel.
Please refer to diagram on page 3 1. 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). 2. 5. Input signal XLR (See page 5). 6. Phase reverse switch for channel B For reversing the input signal phase of channel B to allow bridged operation. (See page 7). AC line cord (See page 5). 3. Clip limiter switch Turns the clip limiter on and off. (See page 8). 7.
thermal limiting protection within less than 2 minutes. During this time, the temperature of the power supply will be stabilised at a temperature that will have no effect on the insulation rating of the AC line cord. Secondly, the maximum expected average current under worst case program material which is 1/3 of full power according to the FTC-standard.
Speaker connections are made via the two Neutrik NL4FC Speakon connectors (1). They are the only connectors currently available to meet the EC safety requirements. They are wired in the following manner: Pin -1 Speaker ground. 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.
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. mono. Channel B is now phase reversed. To compensate for that, connect pin +1 on channel B Speakon to speaker negative terminal and pin -1 on channel B to speaker positive terminal. Figure 10. Bridge mono connection The recommended minimum nominal impedance for bridged mono is 4 ohms (equivalent to driving both channels at 2 ohms).
The ”-25 dB” LEDs glow when the output signal is greater than -25dB, 0dB is referenced to full output power. These LEDs also act as signal present indicators. The Clip/limit indicator tells when the amplifier output is clipping or limiting. The two different states can be told apart: • When the clip limiter is engaged it flickers briefly. • Protection features seconds the amplifier will cool down and the cycle will begin again.
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. We have extended the tests in two cases and chosen a standard used for heavy industrial situations.
Appendix A Mains voltage selection LAB 300 is normally shipped for 230 volt AC operation only. For export there is a 115/230 volt 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. 4. If the terminal block is three pole, the amplifier is for 230 volt operation only. 6.
Warranty and disclaimers • General This product is manufactured by LAB.GRUPPEN and is warranted to be free from defects in components and factory workmanship under normal use and service, for a period of one year from the date of original purchase. During the warranty period, LAB.
