Setting gains on my new amp, and read that I should use a 1000 hz test tone at 0db. Downloaded some 1000 hz test tones from a few different websites, both at 0db. When I run them through the Audacity plot spectrum analyzer, they always end up being at least 3-5 db higher at that frequency. So what should I trust, the Audacity analyzer OR the websites which supply these downloadable tones?

When I download the 1000 hz test tone -5db (in this case, from the Kicker website) on the spectrum analyzer it shows 0 db at 1000 hz. Wonder if I should use that instead?

If the 1000Hz sine wave goes from +1 to -1 then itâ€™s â€ś0dbâ€ť .

plot spectrum uses FFT, which means itâ€™s an approximation.
Increasing the window size in plot spectrum increases the accuracy, (and the processing time).

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Thereâ€™s a better way to check the amplitude - Run the Amplify effect. It will default to whatever positive or negative change needed for 0dB peaks. For example, if it shows +3dB your peaks are currently -3dB. If it defaults to zero dB (no change) your peaks are already 0dB.

You can cancel the effect if you donâ€™t actually want to change it, or you can â€śnormalizeâ€ť it to 0dB or whatever you want.

If itâ€™s stereo the spectrum analyzert might me combining both channelsâ€¦ Just a guessâ€¦

There is some â€śimperfectionâ€ť in spectrum analysis or youâ€™d get a vertical line with a pure tone. â€¦I sort-of understand some of the trade-offs and why itâ€™s imperfect, but my math isnâ€™t quite that good.

FYI - Audacity can generate tones (sine waves & square waves and a coupled of other shapes).

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When I tried the amplify effect, it gave me a reading of -.088 for the new peak amplitude to be 0db, but it still was showing 6db on that analyzer However, I mixed the stereo tone to mono, and the db level is now at 0db, exactly as stated on the file download!

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