It has nothing to do with the plastic , it's the wider opening at the end of the cup, opening everything up: bigger wider sound stage bigger an defined bass and cleans up the mids and the highs.

They sound awesome. Big wide sound stage powerful deep dynamic bass. very good transient response, clear and precise  mid range.

  Grado RS60 Modified Cups

How did you get the brackets to fit or did you make custom ones. I am using the same cups.I listened to them and they sound very good big wide sound stage and awesome bass , focus, vocals are crystal clear.  

I got it at Home Depot you can get them in any home improvement store.  go to the plumbing section.  

Where did you get the get the plastic pipe?

It dose not matter what they look like, they sound awesome.  

You don't want the wood to make any sound, you want to be as neutral as possible.There's a misconception about this, wood is good for musical instruments that have to produce a certain sound, timbre and tone.Using wood adds vibration and smears the sound and cuts down the dynamics of the music

 

I think if you listen for a while you will notice the low end is more defined and more like a sub woofer bass where you kind of feel it a little more than you hear it

I tried 4 vent holes and it really screwed up midrange and the bass became muddy. then I tried 10 holes and it opened up everything .More dynamic more defined bass and detail. I also noticed that when i damped the magnet on the back of the driver I covered up the two holes on the magnet cover...

They sound great! very good bass wider sound stage.  

=Modded RS 60 with PVC faux woodies  

Modded Grado RS 60 with PVC faux woodies                      

Hello, Here is my transformed i Grado headphones:   First  I  Removed the drivers cut all of the mounting tabs. I had a pair of Sony MDR-V150 Headphones that I never use so I used it for parts.You can use any headphones that you can make fit.The ear pads fit perfectly, just a little bit...

Thanks

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I tried a different mod on the ear pad: Cut a larger hole than a quarter and then when you reinstall the pads reverse them, this seems to open up the sound stage and focus the sound.

I just purchased an igrado great headphones!! Mine did not have any inside foam but it did have thin mesh screens over the outside of the driver housing. I also tried a different mod on the earpads, cut a little more than a quarter, then reverse the pads when you install them, this realy...