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<blockquote data-quote="thch" data-source="post: 1785035" data-attributes="member: 562032">the amp may be incapable of ratings below 0.5% or the lower ratings might be associated with very low power ratings or odd resistances.a handheld oscope almost certainly won&#039;t be able to detect 0.5% clipping.&nbsp; visually, anything less then 1% will be hard to see.&nbsp; I forget excatly what is visible on a real oscope that has more then 6 bit effective resolution.&nbsp; IIRC 1% was around the limit of visibility.&nbsp; that was on a real oscope though.adding a bandstop network can improve resolution dramatically, and would be invaluable in trying to make detections of less then 1% distortion.techinically a DMM could work with the bandstop, but i&#039;m not optimistic you&#039;ll detect less then 1% distortion still.i really wouldn&#039;t worry about that too much from a practical standpoint.&nbsp; its more important if you are trying to impress people your selling an amp to.&nbsp; other feilds of audio often give ratings at 1% THD and 10% THD.&nbsp; this makes sense because people will tolerate the higher distortion in hopes of more power.</blockquote>

[QUOTE="thch, post: 1785035, member: 562032"] the amp may be incapable of ratings below 0.5% or the lower ratings might be associated with very low power ratings or odd resistances. a handheld oscope almost certainly won't be able to detect 0.5% clipping. visually, anything less then 1% will be hard to see. I forget excatly what is visible on a real oscope that has more then 6 bit effective resolution. IIRC 1% was around the limit of visibility. that was on a real oscope though. adding a bandstop network can improve resolution dramatically, and would be invaluable in trying to make detections of less then 1% distortion. techinically a DMM could work with the bandstop, but i'm not optimistic you'll detect less then 1% distortion still. i really wouldn't worry about that too much from a practical standpoint. its more important if you are trying to impress people your selling an amp to. other feilds of audio often give ratings at 1% THD and 10% THD. this makes sense because people will tolerate the higher distortion in hopes of more power. [/QUOTE]

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