The design principle of the sound knowledge literacy of the speakers

The speaker box is also called as "an open type sound box"". It has a long history, it can be said is the originator of modern kinds of speaker, radio from birth began almost used all the speakers.
When we don't give a bass speaker installation "baffle", in the free radial of the speaker, it emits low frequency sound in the two sides of the diaphragm air compression and rarefaction of offset each other, so there is no sound radiation. This phenomenon is known as "sound short circuit".
The simplest way to avoid acoustic short circuit, the loudspeaker is arranged on the baffle, baffle shapes can be various, the greater the baffle, bass is more abundant.
If we have on hand has a "infinite baffle", then you can not ideal acoustic short circuit phenomenon of low-frequency radiation.
But in practical use, we can only get the finite size of the baffle, but it does not matter, as long as the size is large enough, more than half a wavelength of the frequency with which we are concerned, we can think it is infinite.
if we adopt the baffle is circular, and the loudspeaker is installed in the middle of the baffle, and in a certain frequency start, it below the frequency will produce sound short circuit phenomenon, the frequency that is called a cutoff frequency.
Opening speaker box is widely application in radios, tape recorders, television sets, the loudspeaker box is followed by Zhang Fanxiang bent and formed a small baffle and the voice of the combined pipeline. Principle of it and the plane baffle, sound waves are emitted from a loudspeaker and anti phase and behind the sound waves can radiation to the front and do not produce offset.
Because of the existence of the cut-off frequency, so in order to replay the bass will require a lot of speakers.
and plane baffle different, owing to made into a box shape, and have a certain depth may speakers each reflection surface caused by the normal mode of vibration, will form a series of peaks and valleys.
so the size, shape and the installation position of the speaker must be carefully considered, so that the vibration is excited, in particular, to avoid the "merger", which will form a very serious sound staining. The specific method is that the size of the box body should be in the principle of the number of each other, in addition to the center of the speaker should deviate from the center of the board.
; the design in order to avoid box to produce a standing wave caused by resonance, should try not to make the box plate parallel to each other and in the box also posted on the sound absorption material.