Hello. Below are 2 links to information regarding both of these models from www.headphone.com The bottom line is that the px200 is a closed headphone design where the px100 is an open design. Follow these links and you can read their opinion. Personally, I am glad I have the px100 and not the other. PX100 http://www.headphone.com/layout.php?topicID=3D3&subTopicID=3D26&productID= =3D002008 0010 PX200 http://www.headphone.com/layout.php?topicID=3D3&subTopicID=3D26&productID= =3D002008 0020 Best regards, =20 Rick Alfaro ralfaro@xxxxxxxxxxxxx -----Original Message----- From: bookport-bounce@xxxxxxxxxxxxx = [mailto:bookport-bounce@xxxxxxxxxxxxx] On Behalf Of Peter Rand Sent: Saturday, November 20, 2004 1:53 PM To: bookport@xxxxxxxxxxxxx Subject: [bookport] Senneiser PX100 headphones vs. Senneiser PX100 headphones A lot of people on this list have recommended the Sennheiser PX100=20 folding headphones, which made me curious enough to do a search for them on the web. Most of the websites selling the PX100's also sell Sennheiser PX200=20 headphones, which I think are $10 or $15 more than the PX100's. For the life of me, I can't figure out what the difference is between=20 these two models - I would be interested if anyone could explain the differences between the=20 PX100's and the PX200's. Thanks, Peter