USER MANUAL HEADLINES LAB 500 USER MANUAL Unpacking 2 Warnings 2 User responsibility 2 1. 2. 3. Speaker damage Speaker output hazard. Radio interference. Introduction 1. 2. Installation 1. 2. 3. 4. 5. 6. 7. 4 Mounting Cooling Operating voltage Grounding Power consumption Input connections Connecting speakers Operation modes 1. 2. 3. 4.
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.
The rear panel Figure 2. Rear 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). 5. Phase reverse switch for channel B For reversing the input signal phase of channel B to allow bridged operation. (See page 7). 6. 2. AC line cord (See page 5). Input jack Alternative to using input XLR or for linking inputs with other amplifiers. (See page 5).
BROWN LIVE BLUE NEUTRAL GREEN/YELLOW EARTH 5. Power consumption There are three ways to determine the power/current consumption of the amplifier: First, the peak current draw at full output power. Under this condition the power will trip the 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.
Figure 3. XLR input connector pinout A more optimal method for handling unbalanced sources is shown in Figure 8. This is similar to the connection for balanced lines, but pin 3 is tied down to shield, at the source side instead. The hum and noise rejection for the cable is equivalent to that for a balanced line. To minimize hum in the audio, use balanced inputs whenever possible. There are also TRS jacks for linking etc. They are wired as follows: TIP HOT RING COLD SLEEVE SHIELD/GROUND Figure 4.
Figure 8. Balanced line with unbalanced equipment 7. Connecting speakers 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. Pin +1 Speaker positive. Pin -2 No connection. Pin +2 No connection. Figure 9. Speakon connector Please note that this is the standard wiring convention for Speakon connectors adopted worldwide.
2. Tandem mono For tandem ( dual channel-single input) operation , depress the Link switch. Both channels can now be driven by a signal, at either input connector. The output connection is the same as in stereo mode. You can use either TRS connectors for linking out etc. Do not use the remaining XLR and TRS connectors for mixing or other purposes. Both level attenuators are active, allowing you to set different levels for each channel. Never connect either output terminal to ground or in parallel. 3.
the upper position setting, which has a sensitivity of 0 dB for full power in 4 ohms. Figure 12. Front indicators Protection features Each LAB.GRUPPEN amplifier has many advanced protection features, that will protect both the amplifier and the speakers connected to it, should a fault condition arise. Under normal use these features are inaudible. All protection circuits are independent. Clip limiter The clip limiter is included to prevent dangerous clip signals reaching the speaker and damaging it.
Design features Cooling The LAB.GRUPPEN amplifier runs very cool due to a patented heat sink called IntercoolerTM .
Appendix A Mains voltage selection LAB 500 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 500 is unplugged from the mains voltage. 2. Remove the top cover. 3. Locate the terminal block for the mains cable. 4. If the transformer’s primary side has two wires only, the amplifier is for 230 volt operation only. Figure 13. 230 VAC wiring 5.
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.