USER MANUAL HEADLINES LAB 1300C 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.
Unpacking User responsibility 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. Clip limiter switch. Turns the clip limiter on and off. 3. Input jack Alternative to using input XLR or for linking inputs with other amplifiers. (See page 5). 4. 5. Phase reverse switch for channel B For reversing the input signal phase of channel B to allow bridged operation. (See page 7). 6.
is faulty, its mains fuse will blow, due to this automatic ground system. If however you wish to tie the signal ground to chassis, connect the XLR-connector’s shell lug to pin 1. In the interest of safety never disconnect the earth pin on the AC cord. For all units that are EMC approved (radio interference), there is an AC mains filter. This filter needs the chassis ground for reference, otherwise a current loop is formed via the signal ground. Use the balanced input to avoid hum and interference. 5.
balanced line. To minimize hum in the audio, use balanced inputs whenever possible. Figure 4. TRS phone plug The input impedance is high enough (20 kohms balanced) to allow ”daisy-chaining”, or multiple parallel input connections. To daisy chain, use the TRS jacks provided on each channel. The input circuits also have a high enough headroom, to accept the maximum output level from virtually any low level signal source. Figure 8. Balanced line with unbalanced equipment 7.
Never connect either output terminal to ground or in parallel. The recommended minimum nominal impedance, for stereo or tandem operation, is 2 ohms per channel. 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.
When you power up the amplifier it takes a couple of seconds to check its circuits (this is known as the "soft start" or "slow start" sequence), the fans then blow at high speed before going onto "idle" and the two bottom green LED’s come on to show the output circuits are receiving the correct rail voltage. 3. Input attenuators The two input level attenuators on the front panel, alter the signal level for their respective amplifier channel in all modes.
Short circuit protection All LAB.GRUPPEN amplifiers are completely short circuit protected. The protection circuit permits very high peak currents, but still holds the output devices within the safe operation area. If a short circuit is maintained, the channel affected will eventually go into thermal protection and the cycle will start again. Design features Cooling The LAB.GRUPPEN amplifier runs very cool due to a patented heat sink called IntercoolerTM .
Traditional PSUs behave erratically at certain frequencies, during low frequency cycles (bass), particularly in clip conditions, their output impedance's rise thereby producing uncontrollable speaker cone movement. Under these conditions clip states are more audible. LAB.GRUPPEN SMPS produces its rated power output at all frequencies regardless of speaker demands and AC line conditions. Safety approvals LAB.
Appendix A Mains voltage selection LAB 1300C 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 1300C is unplugged from the mains voltage. 2. Remove the top and bottom cover. 3. If the four electrolytic capacitors close to the front are rated 385VDC, the amplifier is for 230 volt operation only 4.
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.
