Lab.gruppen iP 450 - Manual (Page 8)

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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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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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 p ower from the amplifier’s perspective in bridged mode is that it is
zero voltage at the center 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 iP 450 is 160 W. So, the total bridged
power into the 8 ohms load will be 2 x 160 = 320 W.
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