I'm having trouble finding an affordable low bandwidth analyzer solution for measuring audio spectrum performance (20KHz and below). Does anyone have a suggestion for buying (new / used) or building a s/n ratio meter or distortion analyzer for comparing components at a line level output of 5V pk-pk 1Mohm or less?
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1\$\begingroup\$ So just the spectrum and distortion? There are free tools (RMAA) for doing this with just a sound card and PC. \$\endgroup\$– user1850479Commented May 27, 2021 at 20:14
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1\$\begingroup\$ audacity does it free.... \$\endgroup\$– D.A.S.Commented May 27, 2021 at 20:29
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\$\begingroup\$ 5 Vpp is too much for a PC's line input so use a resistive divider or a volume control potmeter (these are logarithmic for nice volume control). So attenuate the signal, feed into a PC's line input (get a cheap USB external soundcard/stick if your PC doesn't have a line input) and as suggested, use Audacity which is freeware. \$\endgroup\$– BimpelrekkieCommented May 27, 2021 at 20:49
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\$\begingroup\$ @Bimpelrekkie 5Vpp may or may not be too high. Many consumer devices can support the 2Vrms level which is about 5.6Vpp. And surely a slightly more expensive audio interface for connecting mics/guitars/synths can handle such levels easily out of the box, including the gain knob. \$\endgroup\$– JustmeCommented May 27, 2021 at 21:11
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1\$\begingroup\$ to 20 kHz, all you need is a PC and a sound card. Plenty of free options for analysis, or use python+portaudio+numpy+matplotlib to roll your own. That's what I did a decade ago in a professional capacity, nothing was available at any price on the open market to do what I needed to do with some audio signals. \$\endgroup\$– Neil_UKCommented May 27, 2021 at 21:15
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