Re: 10% THD?


"BobG"

I dont think you can see the difference between 0.1% and 3% distortion
in a sine wave. Scope aint good enough. But 'visible clipping' is
about 10%, and is surprisingly inaudible. Try it yourself. Get a scope
and a cd player and a smallish amp and a speaker. View amp output on
scope. Turn up till you see visible clipping. Compare sound with
clipping to sound without clipping.


** Might be almost true for small, SE tube amplifiers with zero negative
feedback.

Their very soft rounding to the wave crests is not easy so easy to notice
compared to typical hard peak clipping seen with all high feedback
amplifiers - particularly with 100 / 120 Hz modulation added from an
unregulated supply.

I can hear that when the THD meter says it is only 0.5 %.



..... Phil



.

Relevant Pages

  • Re: Size of power supply capacitors
    ... > Looking at a scope on the capacitor hot terminal, plus or minus, I see ... > just shy of clipping) music input (no clipping indicated on the lamps ... Same plus or minus. ... you might want to check the scope calibration. ...
    (rec.audio.pro)
  • Re: Amp power ratings|Luxman|different can of worms (short)
    ... Run the amp right up to clipping, ... scope, measure with the Fluke. ... With an amp like this I run a full power clipping check ... the VERY least is the full power check under load. ...
    (sci.electronics.repair)
  • Re: CEP and overshoots was Re: Dual mono vs. mono mono interrogative...
    ... I've taken copies of some of JTs scope results. ... any clipping or distortion occurs in the digital processes or the ... But when you consider that clipping in the digital domain causes not ... just harmonic distortion but also aliasing? ...
    (uk.rec.audio)
  • Re: 10% THD?
    ... Absolute nonsense. ... You can easily see clipping on a sinewave on a scope at ...
    (sci.electronics.basics)
  • Re: The KISS AMP: a progress report
    ... what you are writing is that clipping off half the sine wave ... will have no effect on the secondary voltage, or it will drop it to ...
    (rec.audio.tubes)