30 s sweep: seconds per octave
- Input
- 30 s
- Expected output
- 9.03 s
30 / log2(10) = 9.03.
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headphone bass test
Use the Sweep with the headphones on and tap mark when the bass fades. Then adjust the fit and repeat: the difference shows how much of the response came from the seal.
30 / log2(10) = 9.03.
Double the 30 second one.
20 x 10^0.25 = 35.6.
The geometric mean of 20 and 200.
20 x 10^0.75 = 112.5.
Open Guided mode and answer 9 tones from 125 Hz down to 20 Hz. The result shows the lowest frequency the subwoofer played cleanly. To hear what happens in the middle of the range, use the 20 to 200 Hz Sweep and tap mark when the sound changes. Put the subwoofer where it will really sit, because its position in the room changes the result.
Closely enough. A reaction takes around a quarter of a second, and in a 30 second sweep that shifts the mark by about 2% of the frequency, some 0.8 Hz near 40 Hz. To confirm the point, play the single tone at the marked frequency and its neighbors.
You can, with one precaution: use the same volume on both, on the same device and with the same fit. Compare the lowest clean frequency in Guided mode and the dropout mark in the Sweep. The difference is perceptual, but repeatable if the conditions are the same.
It can. Wireless headphones often apply their own equalization and processing, and the manufacturer's app may have a bass boost on. Turn those boosts off to test the headphones alone, then turn them on to see the effect.
Start with the volume low. Loud bass can damage speakers and headphones and tire your hearing. Set the device volume to about 30%, raise it gradually and stop if you hear crackling, hissing or the cone bottoming out. With headphones, keep the volume lower still.
This control only sets the signal. Your device volume matters more: start low and raise it gradually. When you press play, the sound starts at a reduced level and rises over 2.5 seconds (in the guided test, only the first tone).
There are 9 tones, from 125 Hz down to 20 Hz. For each one, say what you heard or felt. At the end the result shows how low your device responded.
Wavelength 8.6 m and period 25.0 ms. A normal ear needs about 51.1 dB SPL to hear this tone (ISO 226:2003 threshold).
The tone stops by itself after 60 seconds. Change the frequency while it plays to find the point where it fades.
Tap the mark button the moment the sound changes. The frequency at that instant is recorded.
The sweep is logarithmic: it takes the same time for each octave. Sudden buzzing or vibration is usually a loose part or the subwoofer port, not the speaker's limit.
Wavelength 8.6 m and period 25.0 ms. A normal ear needs about 51.1 dB SPL to hear this tone (ISO 226:2003 threshold).
Pulses make it easier to notice bass near the limit of the device and expose loose parts and port noise.