Lab.gruppen fP Series FP 3400 User Manual Download Page 6

This indicator illuminates if signals above 12 kHz are continuously present at full power at the output 
terminals. If this occurs the input signal is muted, and the process cycles until the VHF signal is no longer 
present. (See page 

16

 
5. Clip/limit indicator 

This indicator signals if the amplifier output is clipping or limiting. It has two different indication states: 
If the clip limiter is engaged, it has a short time constant, and it illuminates briefly. 
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

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Figure 2: Rear panel 
 

1. Output / Speaker connector  

The Speakon connector from Neutrik® may be unfamiliar to some users. A full description can be found 
in the “Connections” section. (See page 

14

 
2. Minimum load selector (MLS™) switch 

These switches are used to select the maximum output power. (See page 

8

 

3. Clip limiter switch 

Turns the clip limiter on or off. (See page 

15

 
4. Input signal XLR

Neutrik® Combojack features also ¼” TRS phone jacks. (Pin 2 is “hot”, see page 

13

 

5. Link output

 

XLR male connector connected in parallel to the female for linking the channel to another input. 
 

6. Gain switch channel B

 

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

 

7. Link/Bridge switch

 

Two of the switches in the DIP switch are used for Link and Bridge operation. (See page 

6

 

8. Gain switch channel A

 

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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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