预购网页
http://www.ttvjaudio.com/Grado_GH1_open_headphone_p/gra0001000.htm
然后应该也是限量生产
Very special limited edition headphone from Grado Labs. These headphones are
made from locally harvested wood from a Brooklyn tree.
对岸有人写信去问相关情报
官方说法是素质在RS1跟RS2之间....
http://www.erji.net/read.php?tid=1820860