The inverting box is the most commonly used speaker at present. It adds a carrying tube (inverted tube) to the closed box. One end of the tube communicates with the air inside the box, and the other end passes through the opening in the box wall (inverted port) to the outside of the box. When the diaphragm of the horn unit moves, on the one hand, the sound waves are directly radiated to the outside, and on the other hand, the air in the box is compressed (or expanded). The control gas in the tank is discharged from the inverting port, so that the inverting port becomes the "second diaphragm" for inducing air. If the design is ingenious, the inverted tube-box system can just reverse the sound wave radiated by the diaphragm 180 degrees (the inverter box is named), so that the sound waves radiated from the opening and the front of the diaphragm are radiated. The sound waves are in phase, and the in-phase radiation superimposes the sound energy, thus enhancing and extending the overall low frequency response of the speaker. The inverting box and airtight uses the back radiation energy of the diaphragm, so the efficiency is relatively high. However, the phase inversion box is not perfect. In addition to the difficulty in designing and debugging than the closed box, the air flowing rapidly at the opening is likely to cause airflow noise. In addition, the phase inversion is essentially achieved by acoustic resonance, and thus the acoustic wave transient response radiated by the opening is relatively poor.
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