Frequency Response Curve and the NEW Dekoni Sennheiser HD600 Pads

Frequency Response Curve and the NEW Dekoni Sennheiser HD600 Pads

Ok, here it is.  The long-awaited Frequency Comparison charts for the Dekoni Audio HD600 Ear pads.  Careful analysis and hours of listening go into our ear pads and we stand by our models as the best of the best as far as replacement ear pads go.  I’m going to just jump right into it.


I will say, before I continue, that you should always give new pads a few days of listening to get used to them before issuing any judgements for or against.  A pad swap is probably the quickest and most effectual mod you can do to a set of headphones so the difference you hear may be very different from the pads you previously had on the headphones.   That said, sometimes one may equate sounding “different” with sounding “worse” because it’s not the same (which they grew to like and love).  Given a chance though you may find the new pads, once you adjust, actually make a change for the better that you didn’t think was coming.  So always give pads a chance.  You Just might find they’re better than the ones you had and that’s what we do this for.


Also, note that because the Headphones are open back the sound will not change as much as they might with, say, a closed back set as you aren’t changing the inside pressure levels or air flow nearly as much.  You will see that the graphs on the 4 variants are very similar with a few minor differences.  No change is greater than 2-3db between any of the frequencies so everything is fairly subtle.  Nothing drastic happening.


First up is the most popular pad in the line-up.  The HD600 Fenestrated Sheepskin. You will see from the image below there is a fairly equal lifting of the frequency range from the bottom to about 2,000 cycles.   This is representative of the change from a rounded pad to a Squared off one where the inner wall of the pad acts more as a funnel in rather than a diffusor as a rounded pad might.  You will notice this in all the variants and they are all very similar in their response.  The lower frequencies have nowhere to go but inside your ear.  You’ll notice a slight dip then between 2K and 5K on the Fenestrated pad with the frequency response remaining almost identical up to 20K with a slight bump on stock above 15K.  All of this goes to the Dekoni pad, to my ears, sounding a little warmer.  I have felt the HD600 to be missing a little “meat’ in the mid-range and our pads seem to bring it in just enough.  


Next up is the Dekoni Sheepskin Edition.  You’ll notice it looks very similar to the Fenestrated all the way up to about 12.5K where there is a significant amount of the high frequency material that is maintained, instead of lost to the stock Velour pads.  To my ears, this pad cuts the frequencies in the “conchal bowl” enough that they sound more neutral in this configuration.  Instead of seeing a boost in the low and boost in the high, picture if you increased the amplitude of the Sheepskin pad graph and it would invert to a slight dip between 3K and 10K, where our ears are most sensitive.  This is due, again, to the sheepskin surface directing all the frequency material from the speakers into your ears instead of the loss you experience into the pads.


The Hybrid pad is very similar to the others in the sub 2K range but above that it is almost an exact frequency match with the Stock pads.  These sound a little louder than stock (less material loss) with a slight screen on the high end which seems to even out the tone of the headphones.

Now, on to the Elite Velour model which matches very similarly to the Fenestrated Sheepskin as well with not quite as much of a rise above the 2K Range but some is still present.  These pads are extremely comfortable and seem to maintain a lot of the Primary characteristics of the HD600.

That Folks, is one opinion of many but it is mine and I’ll stand by it!  Thanks for reading an I hope that we have made a pad for the HD600 that people will see as an upgrade and an update to the stock pads.  If you want to discuss further please feel free to reach out to me personally at the email here.

Tal Kocen

Owner, Dekoni Audio

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Comments (3)

  • Mike Applebaum Reply

    Dear Tal,

    Thanks for the very interesting information and the graphs. I use a variey of Sennheiser headphones, including the 580, 600, 650 and the 660s. Headphone sound analysis is a bit of a complex study, so If you don’t mind could you please rate the four types of pads offered from darkest to brightest, as the subjective perception of the sound is not always reflected in the graphs.

    My main complaint with the old style stock Sennheiser pads is that they flatten so quickly (within a year or so they need to be replaced), changing the sound signature significantly. It’s true that Sennheiser has improved their pads, and they are now mounting the new style pads that came out with the HD 660s model as standard. However, the material, although a little stiffer, does not seem like memory foam to me. Can you tell me what kind of foam you use in your pads, and what the expected life span is?

    Thanks in advance!

    Cordially yours,
    Mike Applebaum

    April 16, 2018 at 10:07 am
  • Vincent Chang Reply

    It would be great to have a follow-up to this with the HD6XX (basically HD650) and the newer Massdrop HD58X Jubilee! I have been using the hybrid pads with my pair of HD6XX to much liking, and I’m sure that seeing the frequency response comparisons would help future buyers. I ended up getting in on the latest drop over at Massdrop for a pair of fenestrated sheepskin pads and I’m looking forward to mix-matching to see which set of pads I prefer on each headphone.

    Great job Dekoni.

    July 3, 2018 at 1:57 am
  • Evan Reply

    Any thoughts on how this would work with sonarworks since the idea is to flatten the eq curve?

    September 5, 2018 at 11:46 am

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