sennheiser hd250 linear 2 headphones: additional info (Bob Carlyon )

Subject: sennheiser hd250 linear 2 headphones: additional info
From:    Bob Carlyon  <bob.carlyon(at)MRC-APU.CAM.AC.UK>
Date:    Wed, 8 Jul 1998 15:34:12 +0100

There is a further point which I should have made in my recent email describing the sennheiser HD250 headphones. Sorry to bother everyone, but I would hate to mislead by ommission. The additional point is that frequency response measured in a coupler is quite irregular below about 210 Hz, increasing by 15 dB down to 100 Hz then decreasing again by 8 dB down to 75 Hz before reaching a second peak at 30 Hz. The good news is that the situation in a real ear (as measured on four subjects by Dr. Hirahara [hirahara(at)]) the situation is rather better: the response increases smoothly by about 6 dB from 210 Hz down to about 100 Hz and remains flat below that. Once again, I recommend Dr. Hirahara's JASJ article (vol 53(10) p798-806) to those interested in selecting a headphone. bob carlyon ------------------------------------------------------------------------------ Dr. Bob Carlyon MRC Cognition and Brain Sciences Unit 15 Chaucer Rd. CAMBRIDGE CB2 2EF England Phone: (44) 1223 355294 ext 720 FAX: (44) 1223 359062 email: bob.carlyon(at) ---------------------------------------------------------------------------- -- Email to AUDITORY should now be sent to AUDITORY(at) LISTSERV commands should be sent to listserv(at) Information is available on the WEB at

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