Acoustic options
http://www.microsonic-inc.com/index2.php?section=49
歪み
ER-4S
http://sonove.angry.jp/Distortion_at_100dBSPL/THD_ER4S_2.gif
Klipsch X5
http://sonove.angry.jp/Distortion_at_100dBSPL/THD_X5_2.gif
ATH-CK100
http://sonove.angry.jp/Distortion_at_100dBSPL/THD_ATH_CK100_2.gif
AKG K3003
http://sonove.angry.jp/Distortion_at_100dBSPL/THD_K3003_2.gif