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http://dx.doi.org/10.7776/ASK.2018.37.5.317

The acoustical effect due to the hole of pole piece for by dynamic speaker  

Oh, Sei-Jin (Department of Speech Therapy/Hearing Aid, Chungbuk Health & Science University)
Publication Information
The Journal of the Acoustical Society of Korea / v.37, no.5, 2018 , pp. 317-322 More about this Journal
Abstract
It has been generally known that a hole presenting on the center of pole piece for the loudspeaker can be very helpful for the heat, which is radiated by Joule Effect at the voice coil, to emit to the outside of the magnetic gap. The existence of hole can also become a cause of the changes of the acoustical properties about the loudspeaker. The resonance frequency of loudspeaker increased with the increase of hole radius. However, increasing the hole length resulted in the decrease of the resonance frequency. These results are in an excellent agreement with the theoretical predictions for the equivalent mechanical circuit of Bass-Reflex cabinet system. The acoustical property of the loudspeaker with hole can be also predicted by the theoretical interpretation of Bass-Reflex cabinet system.
Keywords
Dynamic speaker; Resonance frequency; Bass-Reflex cabinet system; Pole piece;
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