Here's a unique earphone with pewter earpieces. This design had me thinking (no pun intended) of Grado's porous-metal earcup housings that they use in some of their full-size headphones. The idea here is similar - to reduce resonances in the driver housings. U.S. made, the MSRP here is $179, but I don't know at this time what the international availability will be.
http://www.hifiheadphones.co.uk/com...sp1-pewter-earpiece-iem-earphone-review.4518/
http://www.hifiheadphones.co.uk/com...sp1-pewter-earpiece-iem-earphone-review.4518/
