Suwoofer Amplifier Auto-On adjustment - diyAudio
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Old 10th December 2014, 12:08 PM   #1
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Default Suwoofer Amplifier Auto-On adjustment

In general can the sensitivity of the auto-on function of subwoofer switching amplifiers be adjusted or is the sensitivity fixed by design?
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Old 11th December 2014, 04:12 PM   #2
TBTL is offline TBTL  Germany
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Join Date: Oct 2013
It depends. If the circuit consists of an opamp that compares the input signal to a specified value (like this schematic), you almost have complete freedom of setting the threshold value by changing some resistors. If the circuit buffers the signal and then sends it through a diode to turn on a transistor, there is a minimum value for the threshold.

Last edited by TBTL; 11th December 2014 at 04:17 PM.
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