Lab.gruppen iP 1150Q - Manual (Page 8)

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! NOTE: Channel B and D is always polarity reversed on the input, but polarity compensated by
feeding the minus pin on the Channel B and D outputs with the output voltage. Channel A and
C outputs are connected in normal polarity mode. By having channel A and B (and C and D)
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 and D.
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In tandem mode two or four channels' inputs are linked and receive the same signal. The tandem mode
is active if the Link switches are in the pressed –“IN”-position "On". All 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 two channels' power to a single load.
The nominal impedance of the load must be more than 3 ohms. Set the Link
switch to the pressed –“IN”-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.
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Bridged mono mode combines the power of two 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 power from the amplifier’s perspective in bridged mode is that it is
zero voltage at the centre 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 1150Q is 200W. So, the total bridged
power into the 8 ohms load will be 2 x 200 = 400W
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