what is the JVC marshmellow kramer mod about?

[quiksliver]

I've heard about this, I googled it and I couldn't find anything about it, what is it?

[ShinyFalcon]

It's when you remove the paper filter from the nozzle and replace it with a cube of foam. The result is better bass and highs. There's details in the JVC Marshmallow FX33 thread.

[DoomzDayz]

better mids too, helps the harsh irritating peaks in upper mids