Lab.gruppen fp 6400 Mode D'Emploi

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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.  

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.  

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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.  

 

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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.