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Sennheiser HD238: Brief Review and Modding - Page 4

post #46 of 53

Getting another pair of these today, going to recable them with Toxic Cables SPC 26awg cable, and do the foil mod. Will let you know how it goes, and maybe lots of pictures of the recable. Hopefully the SPC cable will bring out details and control the bass.

post #47 of 53

Recabled, didnt do the foil mod though, maybe another day. These sound pretty good.

 

 

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post #48 of 53
Any noticeable difference in sound?
post #49 of 53
Bass isn't as boomy, slightly more details in the mids and highs, also the mids came forward a bit.

I did the cable for sound and because the stock cable is horrendously thin and bad quality
post #50 of 53
Thread Starter 

Wow, it's been a while for me in this thread, didn't realize there were that much interest for it. 

 

Good work randomkid, looks nice.

post #51 of 53
Just experimenting with foil mod, think I'm gonna try dynamat too, maybe foil, felt, then dynamat on the back of the driver.
post #52 of 53

found my favourite, only gripe is the highs arent quite as detailed, but still good. Bass is a lot more punchy as the slightly boomy bass annoyed me.

 

Dynamat on the back of the driver, thick felt around the dynamat, stock foam with foil.

 

 

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Edited by ostewart - 11/20/12 at 4:00am
post #53 of 53

I need to say thanks to the OP. My HD238 has been lying under the bed for almost a year because I could not bear the bloated bass (already did Astroid's mod shortly after purchase in a desperate attempt to save the sound/headphones, which did not help much). I had vacation so I thought I might try doing something about the dark sound and revive the headphones.

 

Based on the OP's experiments with cotton and other stuff, I first tried removing the black foam from the driver housing. This exacerbated the bass bloat problem. So I just did the opposite of that - I put the black foam back in and added some more cotton behind the drivers. To my surprise, it worked in a way similar to a regular bass-reflex speaker cabinet. The more cotton I put in the cavity, the less bass I got from the headphone. Unlike for bass-reflex housing, this also has some impact on other frequencies (there's just one cavity for everything). I found putting too much cotton inside resulted in overly bright sound (even without any alu foil). This can be, to a certain extent, compensated by putting some cotton where the black foam was removed from with Astroid's mod).

 

After some experimenting, I have here a headphone which is sonically close to my Superlux HD668B (the treble is even a bit cleaner). Considering how (bad) HD 238 sounds stock, this is a huge surprise to me. And all this can be achieved just by slightly adjusting what's behind/in front of the driver? :)

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