Closed audio box

Closed audio box

• Closed boxes are structures that completely enclose the internal section of the speaker, isolating the decompression zone from the compression zone.

Caja infinita

Closed boxes (Laboratorio C, n.d.; PCP audio, n.d.) are structures that completely enclose the internal section of the speaker, isolating the decompression zone from the compression zone.

One of its advantages is its moderate size, and that the temporary response is good.As disadvantages, say that the cutoff frequency is not very low, with a size ofnormal box. In addition, the air contained in the box, at large SPL (Sound Pressure Level), acts as a spring and creates high distortion at high volume. 

For the design of a closed box speaker it is represented by eliminating the portion of the pipeline and neglecting the losses of the box. 

It is a volume of closed air, so the Fb (frequency of tuning, resonance frequency of the speaker inside the box) will always be greater than Fs (resonance frequency of a speaker without box), so it is convenient to use speakers with Fs low. 

Operating principle: 

To avoid an acoustic short circuit between the two faces of the membrane, it must bePlace the speaker on a closed box. The rear wave will be damped bymedium of acoustic materials.

References:

Laboratorio C. (s.f.). Cajas Cerradas. Recuperado de http://www.labc.usb.ve/paginas/EC4514/AUDIO/Altoparlantes/Cajas_Cerradas.html

PCP audio. (s.f.). Introducción a las cajas acústicas. Recuperado de http://www.pcpaudio.com/pcpfiles/doc_altavoces/cajas/cajas.html

How to cite this article:

Nocetti, F.A. (2014). "Closed audio box". In NabbuBlog. Retrieved from http://nabbublog.blogspot.com/2014/11/closed-audio-box.html