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<blockquote data-quote="thch" data-source="post: 1536316" data-attributes="member: 562032">some replies:@AcidDreams, i actually had planned to build active versions of the detector and have pricing in the $30 area.&nbsp; but at this time i&#039;m still working on a full wave, low noise voltage controlled amplifier.&nbsp; I know of one way to do a VCA, but i&#039;m not sure it&#039;ll work.&nbsp; the problem is that the circuit must work over a wide range of inputs.&nbsp; from 2V to 200V (Preouts of HU to some of the high powered amps).@JimJ, the amp cannot supress the odd harmonics, if it could then it would not clip.&nbsp; however the amp could clip asymetrically.&nbsp; this would be even harmonics, and would be picked up.@thylantyr, the circuit uses the amps output terminals.&nbsp; the circuit you describe doesn&#039;t seem to actually detect clipping.&nbsp; It sound more like an automated DMM method.@theCybe, the circuit is wired in shunt with the speaker.&nbsp; it will pick up distortion, so if the woofer can cause signifigant distortion from the amp, it will show.&nbsp; likewise the circuit should not be placed at the woofer end, as non-linear current flowing through the speaker wire will generate a signal and you will measure this distortion.</blockquote>

[QUOTE="thch, post: 1536316, member: 562032"] some replies: @AcidDreams, i actually had planned to build active versions of the detector and have pricing in the $30 area. but at this time i'm still working on a full wave, low noise voltage controlled amplifier. I know of one way to do a VCA, but i'm not sure it'll work. the problem is that the circuit must work over a wide range of inputs. from 2V to 200V (Preouts of HU to some of the high powered amps). @JimJ, the amp cannot supress the odd harmonics, if it could then it would not clip. however the amp could clip asymetrically. this would be even harmonics, and would be picked up. @thylantyr, the circuit uses the amps output terminals. the circuit you describe doesn't seem to actually detect clipping. It sound more like an automated DMM method. @theCybe, the circuit is wired in shunt with the speaker. it will pick up distortion, so if the woofer can cause signifigant distortion from the amp, it will show. likewise the circuit should not be placed at the woofer end, as non-linear current flowing through the speaker wire will generate a signal and you will measure this distortion. [/QUOTE]

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