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N= `lkqbkqp= 1 2 3 4 5 6 7 8 9 CONTENTS .......................................................................................................................................1 APPROVALS.....................................................................................................................................2 WARNINGS ......................................................................................................................................2 3.1 Explanation of graphical symbols ..
9.1.6 DC protection ...................................................................................................................16 10 MAINTENANCE.........................................................................................................................16 10.1 Troubleshooting........................................................................................................................16 11 SPECIFICATIONS ...........................................................................
10. Do not use this amplifier if the power cord is broken or frayed. Protect the power cord from being walked upon or pinched particularly at the plugs and the point where it exits from the apparatus. 11. Only use accessories specified by the manufacturer. 12. The unit is intended to use in a 19” rack. Follow the mounting instructions. When a rack on wheels is used, use caution when moving the loaded rack to avoid injury from tipping over. 13.
Q= fkqolar`qflk= 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 you with the advanced features of this amplifier. QKN= råé~ÅâáåÖ= 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.
. Fan grill filters Two grilles with foam filters are located on the front panel to prevent dust from entering the amplifier. For easy cleaning of the filters the grilles are removable by simply pulling them off. The foam filters should always be used. 7. Power switch Turns mains power on or off. (See page 10 and 14) QKP= oÉ~ê=m~åÉä= Figure 2: Rear panel 1. Output / Speaker connector The Speakon connector from Neutrik® may be unfamiliar to some users.
R= ob^o=m^kbi=cb^qrobp= Before turning the amplifier on please read the following sections to make sure that the unit is set up properly for your specific application. RKN= d~áå=ëïáíÅÜ= The gain switch located on the rear panel (the central DIP switch) changes the input sensitivity of the amplifier. This can be handy when using low or high nominal input signals. E.g.
RKP= léÉê~íáçå=ãçÇÉë= RKPKN= píÉêÉç=ãçÇÉ= In this mode both channels operate independently of each other. This is used for all 2-channel modes, such as stereo and bi-amping. Set the two centre switches to off position for the stereo mode. The level attenuators on the front panel will control the respective channels levels. 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.
RKPKR= _êáÇÖÉ=ãçåç=ãçÇÉ=ÑÉ~íìêÉë= Bridged mono mode combines the power of both channels into one speaker. This results in twice the voltage swing, four times the peak power and just less than three times the full power of a single channel. One way to understand the load and power from the amplifier’s perspective in bridged mode is that it is zero voltage at the centre of the voice-coil winding.
qj RKQKN= ^=éê~ÅíáÅ~ä=ï~ó=íç=ÑáåÇ=óçìê=jip =ëÉííáåÖë= 1. Check if the loudspeaker can take the amp’s maximum output power (generally, twice the RMS power handling should be okay). 2. If the loudspeaker can handle the amp’s maximum output power, leave MLS at its highest position (0dB). 3. If the loudspeaker is specified at a lower power handling, reduce the amp’s output power by changing MLS to a matching lower value (3dB). 4. Try the setup with a musical signal.
S= fkpq^ii^qflk= SKN= jçìåíáåÖ= The amplifier is two rack units high (2U) and will fit into a standard EIA 19” rack. Amplifiers may be stacked directly on top of each other; there is no need for spacing in between units. If it is the intention to fill a rack with amplifiers, we recommend to start racking from the bottom of the rack. It is also recommended that rear supports are used for amplifiers mounted in the middle of the rack, especially if used as part of a portable 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 power cord. For all units that are FCC 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.
The chart below shows the heat power produced in watts, in kcal per hour, and also in BTU per hour. HEAT POWER fP 2600 note 1 note 2 8 ohms 4 ohms 2 ohms 1/3 Power(1)1/8 Power (2) 1/3 Power(1) 1/8 Power (2)1/3 Power(1)1/8 Power (2) [W] [W] kcal / h kcal / h BTU / h BTU / h 443 373 380 320 1510 1270 770 630 660 540 2630 2150 1400 1100 1200 950 4780 3750 Average power with music as program source. The amplifier driven to clip level. Normal music power with 9dB headroom, IEC standard power rating.
TKNKO= råÄ~ä~åÅÉÇ=áåéìíë= To connect an unbalanced input source, connect pins 1 and 3 in the cable’s XLR plug (ring and sleeve in a TRS plug). If you leave a pin disconnected, you will lose 6dB. A better method for using unbalanced sources is shown in figure 8. This is similar to the connection for balanced lines, but pin 3 is connected to the shield at the source end of the cable. The hum and noise rejection for the cable is equivalent to that of a balanced line.
U= lmbo^qflk= UKN= léÉê~íáçå=éêÉÅ~ìíáçåë= • Make sure that the power switch is set to “off” before connecting any input or output, or operating the switches on the rear panel. See page 10 regarding installation. • Make sure that the AC mains voltage is correct, and the same as the one printed on the rear panel of the amplifier. See page 10 regarding operating voltage and power consumption.
V= molqb`qflk=cb^qrobp= Each Lab.gruppen amplifier has many advanced protection features. Should a fault condition arise they are protecting both, the amplifier and the speakers connected to it. Under normal use these features are inaudible. All protection circuits work independent from each other. VKNKN= `äáé=äáãáíÉê= The clip limiter is included to prevent from dangerous clipped signals reaching the speaker and damaging it.
VKNKS= a`=éêçíÉÅíáçå= There are two types of DC protection: • Fuses on the supply branches of each channel. • A DC crowbar protection that shorts the output if more than 10 volts DC are being detected on the outputs. Either of these protections comes into effect once DC voltage is being detected, independently for both channels. NM=j^fkqbk^k`b= Under normal use the amplifier should provide years of trouble-free service.
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NO=t^oo^kqv= 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 three (3) years from the date of original purchase from an authorised Lab.gruppen dealer.
