Headphone Simulation Results

Headphone Simulation Results

Sampling the pressure field at points of interest in the headphone cavity produces the frequency response curve below.  Various features are evident, including the increased SPL at ~3-4kHz due to the resonance of the ear canal.  The transducer itself was modelled as a flexible diaphragm excited at the voice coil and clamped at the outer edge.  This is a fluid structure coupled problem and the light diaphragm would be significantly loaded by the enclosed air.


Acoustic Pressure (Phase) Distribution

Certain peaks and dips in the response are in part explained by observing the development and interference of the acoustic waves within the headphone cavity.

 176Hz

3kHz

3.4kHz

6.8kHz

18kHz

 


Diaphragm Breakup at Spot Frequencies

The diaphragm consists of a one piece "moulding" and the suspension is of the same material as the remainder of the diaphragm.  This forces flexure of a major part of the radiating surface even at the lowest frequencies.  As frequency is increased, the radiator "breaks up" resulting in higher order mode-shapes.

176Hz

3kHz

6.8kHz

18kHz