s16n Audio Lab Y-T view with dual timebase and measures

A browser oscilloscope and spectrum analyzer for USB audio inputs — audio frequency only (not RF or lab-bandwidth scopes). Plug in a USB ADC, pick the device, and Start — or use built-in demos. Useful for checking line-level signals from turntables and tape decks for setting head azimuth, anti-skating, testing other audio equipment, codecs, and test gear.

Core scope features are free. Pro ($9.99 / year) unlocks FFT above 10 kHz, the notch filter, THD, Sin(x)/x reconstruction, oversample, and Save 10s video.

Open Audio Lab Buy Pro

Features

  • Y-T, X-Y (Lissajous), and FFT views
  • Trigger: rise / fall / either, Left or Right source, adjustable level
  • DC / AC coupling; show/hide Left and Right channels
  • Notch filter (Off / Notch / Inv) with frequency presets — Pro
  • Persist Off / Lo / Hi (phosphor-style trail)
  • Y-T Sin(x)/x reconstruction and oversample — Pro
  • Time/div, Y (V), and trig-level knobs; auto scale
  • Live measures (Vpp, RMS, freq, period, duty, and more) plus drag A/B cursors; THD — Pro
  • FFT span above 10 kHz — Pro
  • Demos: 1 kHz sine, harmonics, calibrated 3 kHz · 4% THD, CD RF eye, and an X-Y “s16n” vector
  • Save as PNG; Save 10s video — Pro

Example: Lissajous

X-Y (Lissajous) view for tape head azimuth — aim for a tight, stable ellipse/line on a high-frequency test tone. The FFT is also useful for this adjustment: aim to minimize the wandering.

Example: FFT

Works on a smartphone

s16n Audio Lab on a phone