Re.: octave sine experiment

"jpehrson2" <jpehrson@rcn.com> wrote:

>I'm getting rather strange results, though on the "low end..."
>
>40HZ - 80HZ sounds "flat"... which I guess is the "desired" result
>(anything lower really doesn't come out well)
>
>50HZ - 100HZ sounds "correct..." no flatting effect
>
>60HZ - 120HZ is strange. Here the interval actually sounds *too
>wide*... I wonder why *that* would be... ??
>
>and from 70HZ- 140HZ to the middle register, everything is "normal..."
>
>So I guess the 60HZ one is a "peculiar" case for some reason....

Maybe you have some ripple noise coming from the power supply circuit of your amplifier, which interfere with sine sounds; try a simple check with the oscilloscope. You could also check acoustically using a laptop computer running with batteries.

Best regards
Leonardo Perretti