Speaker enclosure with front and internal loudspeakers - has internal speaker supplied with greater power via low-pass filter

摘要

The speaker enclosure includes one front loudspeaker and one internal loudspeaker mounted in a wall which divides two parts of the box. Each of the two parts of the box is sealed. The two loudspeakers are powered in parallel from the signal source to reproduce the sound at the front speaker. The internal receives a greater power than the front speaker. A low pass filter is connected to the supply of the internal speaker. The cut-off frequency of this speaker corresponds to a wavelength equal to half of the distance between the two loudspeakers.