Sennheiser HD250 Linear II

Discussion in 'Audio Science' started by stratocaster, Oct 5, 2015.

  1. spwath

    spwath Collegiate hijinks master

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    Now I am getting more used to these, I like them.
    Right now the only mod is one layer of felt instead of the foam in front of the driver.
    Used orange felt because that's all I had, and looks cool
    [​IMG]
     
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  2. Deep Funk

    Deep Funk Deep thoughts - Friend

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    "Are you Sphongled?"

    Once I played Sphongle on these headphones I knew these were keepers. The low end on these headphones is addicting yet has an accuracy to it that can surprise you. A good one of these will have excellent low end definition, a good midrange and smooth enough highs. Sennheiser made a way too good sounding headphone here.

     
  3. spwath

    spwath Collegiate hijinks master

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    That is pretty trippy.
    Like Philip Glass mixed with psychedelic drugs mixed with electronic music mixed with African tribal music.
    Pretty cool.
     
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  4. spwath

    spwath Collegiate hijinks master

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    Got AD2000x pads from @Griffon
    First impressions: Very comfortable
    5 seconds later: Sound like shit
    Measurements: Shit
    ATHPads.jpg
     
  5. Biodegraded

    Biodegraded Friend

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    That dip at 300 Hz seems to be due to a combination of pad type and rear port configuration. See ultrabike's measurement of Cspirou's stock pair (first post in the MkI thread) and my measurements (posts 10 & 14):

    https://www.superbestaudiofriends.org/index.php?threads/hd250-linear-mk1.1975/

    The rear port mod (stratocaster in this thread) is easy and reversible. You have to play with composition and thickness of the material(s) though - it's a compromise between amount of 300Hz dip (or even elevation) vs amount of low-bass rolloff.

    Are you still using the single layer of felt in front with those pads? How's the treble?
     
  6. spwath

    spwath Collegiate hijinks master

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    I tried with and without felt. I didn't really listen to the treble, as the rest was so messed up. Ill try the rear port mod, see if that can fix it, but IDK, its a realllllly big dip

    EDIT:
    How do you disassemble these? Cant find a way to remove driver...
     
  7. Biodegraded

    Biodegraded Friend

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    Unplug cable; pull cup off headband (not strictly necessary but easier to work with); prise grey rear cup away from silver ring with fingernails; pull black plastic bass port assembly from grey rear cup (if it hasn't already fallen out).

    Edit: The actual driver will remain attached to the silver ring. When setting it aside to work on the rear cup, be careful not to break the wires leading from the cable contact block to the voice coil!
     
    Last edited: Aug 21, 2019
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