Lab.gruppen fP Series FP 3400 User Manual Download Page 8

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As the DIP switch is recessed, one may put a sticker across the bay to prevent from unauthorized changes. 
Another option is to completely remove the DIP switch. This should be done by authorized service 
personnel only! It corresponds to all switches set to “off”, i.e. 32dB gain and stereo mode.  

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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). 
 

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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 f
panel will control the respective channels levels.  

ront 

Never connect either output terminal to ground or in parallel

. The 

recommended minimum nominal impedance for stereo or tandem operation i
2 ohms per channel. 

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NOTE: Channel B is always polarity reversed on the input, but polarity compensated by feeding the 
minus pin on the Channel B output with the output voltage. Channel A output is connected in normal 
polarity mode. By having channel A and B operating in opposite polarity, the energy storage in the 
power supply is more efficient. This is significant for signals below 100 Hz (sub bass etc.) and improves 
the power bandwidth. 

Be sure to use balanced inputs on all measurement equipment (also 

oscilloscope probes) if you are bench testing.

  

 

Reverse operation of Channel B 

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In tandem mode both channels' inputs are linked and receive the same 
signal. The tandem mode is active if the Link switches are in position 
"On". Both level attenuators are active, allowing you to set different 
levels for each channel. Note that only the inputs are connected in 
parallel. This is NOT a parallel output mode. 

Never connect either 

output terminal to ground or in parallel. 

You may use the remaining input connectors to carry the signal to 
other amps. This is called “daisy-chaining”. 

NOTE: Always turn off the Link switch when using the amplifier 
for Bi-amping. 
 

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Summary of Contents for fP Series FP 3400

Page 1: ...m PQMM rpbo j kr i...

Page 2: ...5 3 5 Bridge mono mode features 8 5 4 Impedance matching MLS switch 8 5 4 1 A practical way to find your MLSTM settings 9 5 4 2 MLS technology the background 10 5 4 3 The problem 10 5 4 4 The solution...

Page 3: ...ctric shock to humans The exclamation point within a triangle is intended to alert the user to presence of important operating and service instructions in the literature accompanying the product PKO t...

Page 4: ...ardous voltages There are no serviceable parts inside and removal may void the warranty 18 An experienced user shall always supervise this professional audio equipment especially if inexperienced adul...

Page 5: ...rred during shipping Be sure to save the carton and packing materials for the carrier s inspection It is also advisable to save the carton and packing material even if the amplifier is undamaged Shoul...

Page 6: ...foam filters should always be used 7 Power switch Turns mains power on or off See page 11 and 14 QKP o m Figure 2 Rear panel 1 Output Speaker connector The Speakon connector from Neutrik may be unfami...

Page 7: ...very often a so called loudspeaker processor or controller involved it being unique for the loudspeaker system In most cases the manufacturers of these processors and or loudspeakers recommend a spec...

Page 8: ...polarity reversed on the input but polarity compensated by feeding the minus pin on the Channel B output with the output voltage Channel A output is connected in normal polarity mode By having channel...

Page 9: ...shares the other 4 ohms part The power into 4 ohms from an fP 3400 MLS at 0dB is 1500W So the total bridged power into the 8 ohms load will be 2 x 1500 3000W ne RKQ f Ejip F The MLSTM switches are lo...

Page 10: ...output power by changing MLS to a matching lower value 2dB or 4dB or 5dB 4 Try the setup with a musical signal If the amp runs into thermal protection or into current limiting audible as distortion or...

Page 11: ...justed for a much higher current so it cannot interfere with the requirements by the loudspeaker impedance curve S fkpq ii qflk SKN j The amplifier is two rack units high 2U and will fit into a standa...

Page 12: ...g via a resistor to chassis and the grounding system is automatic If a potential above 0 6V is presents in between signal ground and chassis ground a short circuit is introduced between the two thereb...

Page 13: ...MAINS INPUT POWER MAX OUTPUT POWER Table 3 SKSKN The heat power can be calculated as in the following example We consider a headroom of at least 5dB 1 3 of full power and a 4 ohms load on an amplifier...

Page 14: ...ss in long cables To daisy chain amplifiers use the XLR male connector provided on each channel labeled Link They are connected in parallel with the Neutrik Combojack on each input TKNKO r To connect...

Page 15: ...r of the amplifiers in two ways by increasing the load impedance and by introducing resistive power losses WARNING To prevent from electrical shock do not operate the amplifier with any portion of the...

Page 16: ...tures are inaudible All protection circuits work independent from each other VKNKN The clip limiter is included to prevent from dangerous clipped signals reaching the speaker and damaging it If an amp...

Page 17: ...Q p All Lab gruppen amplifiers are completely short circuit protected The protection circuitry permits very high peak currents but still holds the output devices within the safe operation levels If a...

Page 18: ...ve possible high frequency oscillations from the relevant input Fault The amplifier goes into thermal protection when running at low levels Check that nothing causes a short circuit at the amplifier s...

Page 19: ...NN pmb fcf qflkp i K NU r j m PQMM s NKN OMMPJNMJMO...

Page 20: ...ibility for any loss due to cancellation of any events or rent of replacement equipment or costs due to third party s or customer s loss of profit or any other indirect cost or losses however incurred...

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