Sennheiser HD250 Linear II

Discussion in 'Measurements (unsanctioned)' started by stratocaster, Oct 5, 2015.

  1. stratocaster

    stratocaster Friend

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    I measured asome Sennheiser HD 250 Linear II with stock pads. Subjectively, they are quite nice and balanced sounding. The bass is strong and has some nice punch, male and female voices sound surprisingly natural and clear too. That comes as a surprise, since people have been describing a recessed midrange. The peak at 8k is audible but not too much of a killjoy, the narrow dip at 6.5k indicating ringing in disguise. I am quite digging these and I am certainly going to mess with them.

    stock_fr.jpg

    stock_csd.jpg
     

  2. kapanak

    kapanak Canucklehead - Friend

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    One of my favourite blasts from the past headphones. I look forward to your exploits with these :D
     
  3. JoelT

    JoelT Friend

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    I need to pull my pair out and give them another try. I had been loaning them to a family member, but I recently got them back. I did mod mine with extra damping on closed interior of the cup, some TP over the driver to reduce the treble peak and a different set of pads. Time to revisit them with my OTL driving them. I didn't particularly like them out of my Ragnarok, and definitely felt they were a bit tonally "V" shaped. I suspect they'll be better with some tubes.
     
  4. Deep Funk

    Deep Funk Deep thoughts - Friend

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    Thank you for this measurement.

    This headphone deserves more appreciation. Is almost has that AKG midrange with ample of bass and highs without ever sounding harsh or bassy. For me this headphone sounded right and fun at the same time, slightly more than the AKG K240 DF.

    I must buy one and keep it for good. Fuck Sennheiser for discontinuing this great headphone.

    P.S. If you really like its sound, keep it because few headphones come close.
     
    Last edited: Oct 6, 2015
  5. stratocaster

    stratocaster Friend

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    So, after some modifications ...
    I applied some more damping and replaced the stock pads with some modified HM5 pleather pads,allowing some very slight leakage.
    They still isolate very well and have become my go to closed cans, being very light and comfortable. I have been targeting the sound to my reference, the HD600. And I must say, they do come close. They exhibit more bass slam but lack a little bit of the mid and high frequency finesse of the open 600s. But, as far as I am concerned, these are quite impressive, also if one looks at the distorti on and CSD plots.

    fr_mod.jpg

    csd_mod.jpg
     

    Attached Files:

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  6. JoelT

    JoelT Friend

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    What did you end up using for damping material? I found space to be fairly limited with shallow cup backs.
     
  7. stratocaster

    stratocaster Friend

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    Space is indeed limited. What I did was to approach the back of the driver, which has no HD600 like foam disk, but this kind of dual-vent lid. I eliminated the lid and put some dense foam disk over the driver vent (HD600-like). Anyway, this did not really change the signature drastically, it is the pads that - as in most other mods I have been trying - make the biggest difference. In most cases it is not enough to find an alternative pad, you will almost always have to work on the pads too in order to be really satisfied. IMHO, pad replacement/pad modding + appropriate damping = 90% of modding success.
     
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  8. Darsus

    Darsus Insatiable bowels - Member

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    Let's write the review finally. Stock, they don't sound that good. That 200hz deep is a killer, taking away punch from the snare and creates somehow shallow sound, making lows and highs even more pronounced, and that's probably why many of them call them V shaped, even tho they aren't exactly.

    BUT, when EQ-ed properly, these sound amazing. I love them because they extend sooo well. After some experimentation with noise generator and EQ, I am very satisfied.

    Bass - very detailed, especially sub bass, you can actually differentiate kick tail from a sub bass. When EQ-ed properly, call me crazy, but it reminds me of LCD-3 sub. Now, recalling sound signature from your memory is not a good option, but I might compare them in the future.

    Mids - very good, voice sound really natural on them.

    Highs - Extremly detailed, Royal Blood - Loose Change, at the end, I think you can hear every coin falling on the ground.

    Btw, I like them stock for watching movies, i think their FR is really good for it.

    P.S. Pads are a bit worn out, but I doubt it affects sound so much, because it matches with measurements pretty well. Some small differences, 200hz deep I percieve as -8.5db etc.

    Current EQ - it is heavy, but it does wonders.

    [​IMG]
     
  9. Azteca

    Azteca Friend

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    I would find that chart much more useful if we could see the frequencies on the X axis. And +9 and -6? Yowza. But hey, if it works in your setup, right on.
     
  10. Darsus

    Darsus Insatiable bowels - Member

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    Unfortunatelly, ProQ2 is made that you only see frequencies when you run over the dots. Here are some rough numbers, from left to right:

    45, 200, 450, 2200, 4800 (that small blue one), 5800, 9100, 13100

    Yes, I was worried too, especially when I saw the measurements. But it worked great, wish you could hear them. I still haven't EQ-ed them in detail, but this does the work more than properly.

    My K400 are also unrecognizably better after EQ-ing, would recommend it to everyone for their headphones before deciding to upgrade.

    P.S. If you have HD250 II too I could export some A/Bs.
     
  11. millan

    millan Rando

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    Darsus, I have the Sennheiser HD250 II. Could you please send me the exported EQ settings for FabFilter ProQ2 to mmdsgn@hotmail.com? Many thanks in advance.
     
  12. stratocaster

    stratocaster Friend

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    Got hold of another HD250 Linear II and decided to tweak it a bit.

    Stock:
    stock.jpg

    Modded:
    tweaked.jpg

    Overlay:
    comparo.jpg

    I used some baffle damping and some modified HD800 pads, which I had 'leatherized' and glued on two felt rings (about 8mm thick), allowing for some controlled leakage. I also finally used a layer of felt (1mm) in front of the driver to align the response around 8kHz with the rest of the spectrum.
    mod.jpg

    These sound surprisingly good now. Plus, they are ultra lightweight and isolate really well, too.
     
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  13. Deep Funk

    Deep Funk Deep thoughts - Friend

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    Really well done.

    I wish Sennheiser would make these headphones again instead of things like the HD700.
     
  14. stratocaster

    stratocaster Friend

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    Distortion and CSD below ...

    distortion.jpg

    csd.jpg
     
  15. stratocaster

    stratocaster Friend

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    Well, I guess I am done with these now. Below you will find my final version. I guess extension is really good now, the pads rest further away from the baffle, allowing a cavity deep enough to provide plenty of space for the ear - not quite HD800 wide/deep, but almost. Very comfortable at least.

    final.jpg
     
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  16. stratocaster

    stratocaster Friend

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    Worked on a second set. This time I used stock HD800 pads and allowed more venting in order to bring up the upper bass and lower mids a bit.
    Stock, there is this black cap with its two vents behind the driver, which also 'closes' the cup under the hinges of the headband. I replaced this cap with some kind of foam stopper. I had to find just the right amount of foam/density to get the bass under control. Using a measurement rig definitely helps here.

    set2_changes.jpg

    HD800 pads (with felt foundation to allow controlled leakage) on the new set, really comfortable:
    set2_.jpg

    Measurements (Overlay left/right):
    set2.jpg

    This sounds more dynamic, has more body.
     

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