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I have never been one to be told no

A couple of years ago I purchased (here) some Fostex EMU drivers, I tossed them in a set of Koss cans (yesterday) because the size of the cups look close to the fostex cups.

I added some modeling clay to the baffle and glued cloth to the hard shiny plastic cup to prevent reflections.

My question is what tuning options do I have ? can I port the HPs' ? do I experiment with porting the baffle into the ear area or port the HPs out the back of the cup ? are the original Fostex EMU teak HPs ported or sealed?

any advice appreciated if you have done anything like this yourself.. ?

My results so far are good, I'm just wondering how much better I can make these ?

I have read these drivers produce a lot of bass, currently the HPs sound dry....

*almost like a full range driver in an open baffle, clean but dry. some of my other HPs dig much lower and higher no doubt this is a nice driver but how do I get the best from it ?

 

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woa tripple pic !

 

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amazingly the baffle size was almost exactly the same size

 

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Ha !

I wub da intra - webs

http://www.brentbutterworth.com/headphone-voicing.html

 

[quisxx]

Try porting, all fostex drivers (dynamic) are in ported housings.

 

[quisxx]

Also it looks like you don't have the foam ring that goes in front of the driver.

 

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Try porting, all fostex drivers (dynamic) are in ported housings.

I did not know that, thank you

Also it looks like you don't have the foam ring that goes in front of the driver.

good eye, I had not noticed that detail, thanks again

 

[SHAMuuu]

I hope you don't drill bass port holes into those aluminum cups! I think by fostex ports he is referring to a slight gap like 1-2mm b/w baffle and cups. And some Fostex variants have some damping like spongey acoustic foam / felt, or cotton/ dynamat have been used.
Unique build for sure, curious how it turns out

 

[what?]

I hope you don't drill bass port holes into those aluminum cups! I think by fostex ports he is referring to a slight gap like 1-2mm b/w baffle and cups. And some Fostex variants have some damping like spongey acoustic foam / felt, or cotton/ dynamat have been used.
Unique build for sure, curious how it turns out

Interesting description of the FTX porting design ^ I will have to try it. I can A/B back and fourth between other HPs I have to compare.

So far results are not so good, they sound a bit like the Koss proAA I once owned

 

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ze plot zikkens

https://www.head-fi.org/threads/th-...re-bass-mid-soundstage-smooth-trebles.802704/