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11
Sigma servo feed back
The sound reproduced through conventional amplifiers is distorted due to the
counterelectromotive force produced in the oscillating system of the speaker. The
counterelectromotive force is particularly high with the woofer which requires a large drive
mass.The sigma servo connection reduces distortion caused by the counterelectromotive force
by including the circuit up to the speaker terminals in the negative feedback loop. This makes it
possible to drive speakers with more fidelity to the input signals and create a sharp bass sound
image with few feeling of noise interference.
The speaker cables and sigma servo cables should be distributed along the same paths.
• The extension of the negative feedback loop to include the speaker terminals makes it
necessary to connect the sigma servo terminals correctly. Incorrect connection may result in
sound degradation or other malfunction. If sound is not reproduced normally, check the
connection of the sigma servo terminals, etc.
• If the Sigma servo terminals are not connected, the sound may fluctuate or noise may occur.
Be sure to connect the Sigma servo terminals correctly.
• When connecting speakers in a parallel configuration, use speakers with an impedance of 4
ohms or more. Connecting speakers with smaller impedance than 4 ohms will cause
malfunction.
• The rated input of the speakers connected to this unit should be no less than the maximum
output of the amplifier. Otherwise malfunction may result.
Be specially careful in this when connecting speakers in a parallel configuration.
2CAUTION
NOTE
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Basic sigma servo connection
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Series connection
Make this cable as short as possible.
2CAUTION
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Parallel connection (1)
The speaker cables connected to this unit
should be thick enough to supply the current
capacity of two speakers.
2CAUTION
This connection is possible only when the
speakers are identical and the speaker cables
are also of the same type and length.
2CAUTION
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Simplified sigma servo connection
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Parallel connection (2)
In case any of the connection examples above cannot be
used or if the speakers cannot be connected to the speaker
terminals, connect them to this unit as shown in the figure.