Lab.gruppen fP 2200 - Manual (Page 8)

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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.
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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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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