Tools and charts
Below are the kinds of charts the app draws from measurements. They are interactive, but the data is generated for the example: you take real measurements with the app.
Frequency response and impedance
Demonstration dataLevel (SPL), phase and impedance magnitude of two speakers, which can be overlaid.
Hover over the chart to read values. Scroll wheel or pinch to zoom, drag to pan, double-click to reset. Keyboard: arrows, + and −, 0.
Chart values as a table
| Frequency | SPL A (dB) | SPL B (dB) | Impedance A (Ω) | Impedance B (Ω) |
|---|---|---|---|---|
| 20 Hz | 70.5 | 64.0 | 8.3 | 6.7 |
| 50 Hz | 84.5 | 78.1 | 30.1 | 19.0 |
| 100 Hz | 87.1 | 83.8 | 8.3 | 10.5 |
| 200 Hz | 87.2 | 85.1 | 6.4 | 5.9 |
| 500 Hz | 88.0 | 85.1 | 6.2 | 5.8 |
| 1 kHz | 87.5 | 84.5 | 6.8 | 7.2 |
| 2 kHz | 86.2 | 86.2 | 8.6 | 10.5 |
| 5 kHz | 87.1 | 86.4 | 10.9 | 17.1 |
| 10 kHz | 87.2 | 87.2 | 16.8 | 28.5 |
| 20 kHz | 84.8 | 82.3 | 27.3 | 47.7 |
Decay: waterfall and spectrogram
Demonstration dataHow sound dies away over time, frequency by frequency: resonances linger longer.
Hover over the chart to read values. Scroll wheel or pinch to zoom, drag to pan, double-click to reset. Keyboard: arrows, + and −, 0.
Chart values as a table
| Frequency | 0.0 ms (dB) | 1.5 ms (dB) | 3.1 ms (dB) | 4.6 ms (dB) | 6.0 ms (dB) |
|---|---|---|---|---|---|
| 200 Hz | 87.1 | 85.0 | 83.0 | 80.9 | 79.1 |
| 500 Hz | 87.6 | 82.4 | 77.2 | 72.0 | 67.5 |
| 1 kHz | 87.3 | 84.4 | 81.6 | 78.7 | 76.2 |
| 2 kHz | 86.5 | 68.4 | 50.3 | 41.5 | 41.5 |
| 5 kHz | 87.1 | 49.5 | 42.1 | 42.1 | 42.1 |
| 10 kHz | 87.1 | 64.1 | 42.1 | 42.1 | 42.1 |
| 20 kHz | 85.7 | 40.7 | 40.7 | 40.7 | 40.7 |
Distortion and harmonics
Demonstration dataFFT spectrum of a 1 kHz tone with numbered harmonics and THD, or THD+N across the band.
Hover over the chart to read values. Scroll wheel or pinch to zoom, drag to pan, double-click to reset. Keyboard: arrows, + and −, 0.
Chart values as a table
| Harmonic | Frequency | Level (dB) |
|---|---|---|
| F | 1 kHz | 0 |
| H2 | 2 kHz | -64 |
| H3 | 3 kHz | -71 |
| H4 | 4 kHz | -86 |
| H5 | 5 kHz | -79 |
| H6 | 6 kHz | -97 |
| H7 | 7 kHz | -91 |
| H8 | 8 kHz | -104 |
| H9 | 9 kHz | -99 |
| THD | 1 kHz | 0.070 % |
| THD+N 1 W | 100 Hz | 0.052 % |
| THD+N 1 W | 1 kHz | 0.013 % |
| THD+N 1 W | 10 kHz | 0.037 % |
The tools
Analyzer
Oscilloscope, XY/Lissajous and spectrum from the audio interface, full screen, with real-time measurements.
Multimeter
Voltage, frequency, power, THD+N, hum and A-weighted noise from the calibrated audio interface, or a networked bench multimeter (SCPI). Chart and one-minute recording with PDF report.
Turntable bench
Speed, wow & flutter, crosstalk, harmonics and VTA with test records; before/after comparisons and reports.
Reel-to-reel recorders
Guided ten-step alignment: speed, azimuth, levels, equalisation and bias, with the manufacturer’s values and a PDF report.
Room acoustics
Analysis of the listening room with a 3D view of the room and suggestions on treatments.
Tubes
Measurement archive, plate curves and tube matching.