3 m between walls
- Input
- 3 m
- Expected output
- 57.2 Hz
343 / 6 = 57.17.
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bass disappears at one frequency
Use the Sweep and mark where the bass vanishes. Then work out the resonance between the room walls: if the mark lands near the value, the room is the problem, and moving the subwoofer usually fixes it.
343 / 6 = 57.17.
343 / 8 = 42.875.
343 / 10 = 34.3.
343 / 12 = 28.58.
2 x 343 / 8 = 85.75, double the first mode.
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.
Move the subwoofer or the listening spot about a meter and repeat the sweep. If the dropout changes frequency or strength, it is the room. If it stays at the same frequency in any position, look at cables, phase, crossover settings and loose parts. Do this test at a low, steady volume.
It often helps, because the position decides which resonances are excited most strongly. Corners reinforce bass overall, but they also excite all the resonances at once. Try two or three spots with the same sweep and pick the one where the dropout mark disappears or moves lower.
It works as an estimate of the first mode between two parallel, solid walls. In very open rooms, with big openings or walls that flex, the effect changes. Treat the value as a clue to compare with the sweep mark, not as an exact prediction.
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.