Danger
Many conventional subwoofers do not respond very well to infrasonic frequencies. If a test is played at high signal levels, it may damage or destroy conventional loudspeakers, even if nothing can be heard. In a ported subwoofer enclosure, the drivers may be driven past their maximum excursion, due to the lack of back pressure below certain frequencies – they may bottom out and suffer mechanical damage. In a sealed enclosure, the drivers will not move as much because of the back pressure in the box (which will greatly reduce the risk of mechanical damage), but a strong amplifier signal can still damage them by overheating the voice coil.
Read more about this topic: Bass Test
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