Lab.gruppen iP Series IP 900 User Manual page 8

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NOTE: Channel B is always polarity reversed on the input, but polarity compensated by feeding
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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 can use the remaining input connectors to carry 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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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 center
switches to off position for the stereo mode. The level attenuators on the front
panel will control the respective channels levels.
Never connect either output terminal to ground or in parallel. The
recommended minimum nominal impedance, for stereo or tandem operation,
is 2 ohms per channel.
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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 can use the remaining input connectors to carry signal to
other amps. Both level attenuators must be at the same position. We
recommend that you put them in the 0dB (full) position.
Connect the speaker as shown. Always use Channel A's output
connector.
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