[]|[ GorE]

I was wondering what techniques are used by headphone designers to absorb the out of phase sounds emanating from the back of the driver . Do they simply model the enclosure to be round or,is some material used to absorb the sound.....Also,is isolation a function of the material used to make the enclosures ? And how does blu tak work . I understand if it absorbs the resonance of the enclosure to some extent but dont understand how it would tame the highs ( as some member claim,unless the resonances were above the upper midrange....)

Images of headphone enclosures are welcome.

 

[sgrossklass]

You can look at an ATH-A900LTD's interior in this thread. Closed ATs have fairly advanced backwave damping.

 

[facelvega]

mainly it's done through damping (like felt) and limiting the openings through which any backwave might pass. The shape of the enclosure, AFAIK, is mainly a question of tweaking how the backwave bounces around, which is what the blu tak is just another way of doing: not that it's rubbery, but that it changes the surfaces.