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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 AC mains voltage protection ............................................................................................16 9.1.7 The “AC” LED .................................................................................................................17 9.1.8 DC protection ...................................................................................................................17 10 MAINTENANCE................................................................................................
8. Always operate the unit with the chassis ground wire connected to the electrical safety earth. Do not defeat the safety purpose of a grounding-type plug. A grounding type plug has two pins and a third grounding prong. The third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 9. Connect only to AC power outlets rated 100-120V, 50-60Hz. 10. Do not use this amplifier if the power cord is broken or frayed.
• • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. 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.
If the clip limiter is not engaged, it has an increased time constant, and it illuminates for a longer period. (See page 15) 6. 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 11 and 14) 8. AC indicator Indicates if AC voltage is present.
8. Gain switch channel A Three of the switches in the DIP switch selects the maximum gain of the channel to be either 20, 23, 26, 29, 32, 35, 38 or 41dB. (See page 6) 9. AC power cable 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.
RKO= iáåâ=ëïáíÅÜ= The Link switch located on the rear panel (in the centre of the DIP switch) is for changing the operation mode of the amplifier (see next section 5.3). 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.
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.
MLS switches on rear panel 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 (-2dB, or -4dB, or -5dB). 4.
RKQKO= jip=íÉÅÜåçäçÖó=Ó=íÜÉ=Ä~ÅâÖêçìåÇ= RKQKP= qÜÉ=éêçÄäÉã= Assume that a power amplifier can deliver 1000 watts into 8 ohms, and it should be able to run also into 2 ohms. Theoretically, and according to the physical laws, it should be able to deliver 4000 watts into 2 ohms. Very few professional power amplifiers are able to do this, as all conventional power amplifier designs are compromises between power dissipation, cost, size etc.
SKP= léÉê~íáåÖ=îçäí~ÖÉ= WARNING! A label just below the mains cable on the rear of the amplifier indicates the AC mains voltage for which the amplifier is wired. Connect the power cable only to the AC source referred to on the label. The warranty will not cover damage caused by connecting to the wrong type of AC mains. Lab.gruppen switch mode amplifiers use primary switching.
an average output power equal to 1/8 of full power. The one eighth of the total power is as loud as you can play music while making some attempt to avoid obvious clipping. It also corresponds to a headroom of 9dB, which is very low for regular audio program.
T= `lkkb`qflkp= TKN= fåéìí=ÅçååÉÅíáçåë= TKNKN= _~ä~åÅÉÇ=áåéìíë= The XLR input connectors are electronically balanced, and wired according to the IEC 268 (pin 2 = “hot”), and wired in the following way: PIN 1 PIN 2 PIN 3 GROUND/SHIELD HOT (+) COLD (-) Figure 5: XLR balanced Figure 4: XLR input connector Within the Neutrik® Combojack there is a ¼”(6.3mm) phone jack wired in parallel with the XLR.
TKO= `çååÉÅíáåÖ=ëéÉ~âÉêë= Speaker connections are made via the two Neutrik® NL4FC Speakon connectors. The Speakon connector is designed for high power speaker connections. It assures the correct polarity, it locks in place and prevents from shock hazard. They are wired in the following manner: The right jack, Channel A, provides both channel A and B outputs, so it is useful for bridge and bi-amp operation (see bridge mono operation on page 7). The left Speakon, Channel B, carries only the channel B output.
UKP= fåéìí=~ííÉåì~íçêë= The two input level attenuators on the front panel adjust the signal level for their respective amplifier channel in all modes. They are calibrated in dB to assist the setup of active loudspeaker systems, or to cut down unwanted noise from the input signal. In bridge mode both controls must be in the same position, so that the speaker load will be shared equally between the channels. UKQ= fåÇáÅ~íçêë= The yellow LED’s indicate if any protection circuits are activated.
VKNKO= qÜÉêã~ä=éêçíÉÅíáçå= If the amplifier is driven very hard into a low impedance load, the cooling fans will run at high speed. If the causing conditions continue, the “Temp” temperature indicator(s) will illuminate indicating that the amplifier is about to go into thermal shutdown. After approximately five seconds the amplifier will go into thermal protection by muting the input signal.
VKNKT= qÜÉ=“^`Ò=iba= This green LED indicates that there is proper mains power present at the incoming mains power conductors. Electrically it is located in front of the power switch and soft-start circuitry, so it lights up even if the power switch is set to off. Instead of the power switch on the front panel switching the mains the fP 6400 has a power-relay in the soft-start circuitry. This method is more reliable and takes less space than the conventional method that requires a huge power switch.
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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.
