Lab.gruppen fP Series FP 2200 User Manual - R= Ob^o=M^kbi=Cb^qrobp=

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Before turning the amplifier on please read the following sections to make sure that the unit is set up 

properly for your specific application. 

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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. most professional mixing 

consoles operate at a nominal level of +4 to +6dBu; therefore you may use the 32dB position to provide 

you with plenty of fader movement. On the other hand, for a disco mixer operating at a nominal level of 

0dBu or less use the higher gain positions.  

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There are separate sections for the two channels, so different gain can 

be selected for channel A or B. The selection of maximum gain in the 

amplifier is always a trade between noise and headroom. A low gain 

amplifier amplifies less of the noise of the preceding equipment 

(mixer, crossover, equalizer etc.). On the other hand a higher level is 

needed to get full power, so the headroom will be decreased on mixer 

output and/or crossover units. In an actively divided system there is 

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 

specific system gain for the amplifiers. 

There are eight positions with different gain, from 20dB to 41dB in 3dB steps. See the different settings 

for the DIP switches in the table below. The three switches to the very left are for channel B, while the 

three to the very right are for channel A.  

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Sensitivity is defined as how many volts (rms) or dBu (referred to 0.775Vrms) 

are required to get full output power. As the output power varies with the load 

impedance, usually 4 ohms is the reference. But in case of an MLS-switch 

equipped amplifier there are enough choices for full output levels into 

different load impedances for a sensitivity table to fill several pages. 

Hence we recommend calculating the sensitivity if this is necessary. Our 

”Audio calculator” can do this, which is an Excel file with many useful 

formulas. It contains help for setting up digital loudspeaker processors and can 

be found on our website 

www.labgruppen.com

: check in the ”Downloads” 

area. 

The sensitivity calculator is found in the box labeled “Amplifier gain conversions”. The values to enter 

are in red; desired output power (see MLS table), load impedance and the selected maximum gain. The 

sensitivity is in the box labeled “Input level for clip” in Vrms or dBu. 

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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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