Lab.gruppen fp 6400 Guida Utente

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The Bridge mono mode is used to deliver both channels' power to a single load. The nominal impedance 
of the load must be more than 3 ohms. Set the Link switches to the “On” position and use one of the 
input connectors. You may use the remaining input connectors to carry the signal to other amps. Both 
level attenuators must be at the same position. We recommend that you set them to the 0dB (full) 
position. 
Connect the speaker as shown. Always use Channel A’s output connector. 

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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. This is because 
the coil is driven with positive voltage 
at one pole and an equivalent negative 
voltage at the other pole. So, if an 8 
ohms load is connected in bridged 
mode, one channel shares one 4 ohms 
part of the load, and the other channel 

shares the other 4 ohms part. The power into 4 ohms from an fP 6400 (MLS at 0dB) is 2300 watts. So, 
the total bridged power into an 8 ohms load will be 2 x 2300 = 4600 watts. 

The MLS

 switches are located on the rear panel. The MLS (Minimum Load Select) switches offer 

impedance matching, so you can drive the fP 6400 into 2 ohms without increased heat loss. 
As stated earlier, the fP 6400 can produce 2300 watts into both, 2 and 4 ohms. Use lower MLS

TM

 settings 

(e.g. -4 or -5dB) when connecting to lower impedance loads as shown in table 1. As can be seen in table 
1, the fP 6400 can produce output power in excess of 2000 watts. 

fP 6400 

MLS SWITCH SETTING 

 

LOAD 

CONFIGURATION 

-5 dB 

-4 dB 

-2 dB 

0 dB 

16 ohms Stereo (2 channel) 

220 w 

260 W 

410 W 

650 W 

 

    

  

  

 

  

 

8 ohms Stereo (2 channel) 

430 W 

520 W 

820 W 

1300 W 

 

    

  

  

 

  

 

4 ohms Stereo (2 channel) 

830 W  1000 W

1600 W 

2300 W 

 

    

  

  

 

  

 

2 ohms Stereo (2 channel) 

1660 W 2000 W

2400 W 

2900 W [1]  

    

  

  

3050 W  [2]  3200 W [2]  

    

  

  

  

  

 

16 ohms Bridged mono  

860 W  1040 W

1640 W 

2600 W 

 

    

 

  

 

  

 

8 ohms Bridged mono  

1660 W 2000 W

3200 W 

4600 W 

 

    

 

  

 

  

 

4 ohms Bridged mono  

3320 W 4000 W

4800 W 

5800 W [1]  

    

  

  

  

  

 

[1] Depending on component tolerances. 

 

 

 

 

 

[2] Continuous power one channel driven, or peak power both channels driven. 

 

 

     (Thermal protection may occur at high continuous power) 

 

 

 

Power in watts (EIA 1 kHz, 1% THD)