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Hi all -
With the positive community response around the first drop for the 58X (~1.6k units sold), we’ve been able to work with Sennheiser to begin production on those units and additional units without impacting ship time of the first drop. Because of this, will likely be able to open up a couple of limited quantity drops over the next several months.
This first drop will be live at 6am PT on 2/14 with a quantity of 600 units available (the drop will be live until 2250 total units have been sold). These units are estimated to ship in July.
Thanks for helping make the 58X a success!
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Besides the bass Level that is adequate for sound quality and equilibrium , I think the negative effects that were in mind here is bass distorsion. There is a trade off between bass extension and bass distorsion over a certain level. You do not want superb bass extension if too much distorsion comes with it. I trust Sennheiser to increase the bass extension and level without increasing significantly the distorsion in the sub bass region. According to the leaked graphs from DIY, Sennheiser has been able to increase the sub bass very significantly. Impressed I am! I look forward to hear them soon, and hope the distorsion levels remain below the level of which it becomes too Noticeable
True. Yeah, a small boost won't significantly increase distortion much, or mask frequencies above it since almost all of it is below 80 hz. A small dip it above 80 hz and importantly that very slight reduction from 100 hz - 500 hz might actually reduce masking. It would be the area that low boosting would creep into. A vague bass boost usually raises that, as sadly so many otherwise great bass heavy cans are ruined by that. Sennheiser found a way to boost bass, without artifacts above 100 hz, in fact, slightly less in the low mids, meaning, cleaner low mids vs. the original HD58X version, or the HD650, while having more bass than both, though just slightly more than the HD650 - I'll take whatever I can get. Aside from the narrower sound stage, the lack of sub bass was my only big issue with the HD650.
Legendary Line

As enthusiasts, we hope for a really great experience and value in what we buy.

Consistently (for the past 26 years), Sennheiser has been providing great value with a great musical experience in the HD580, HD600, and HD650/HD6XX.  They all use the same driver design and materials.

These models are community recommended “go-to” favorite headphones. Massdrop’s own version of HD650 (the HD6XX) has sold over 30,000 pairs during the past year.

The only real requests for changes we see have to do with color, comfort, a “veil” to the sound perceived by some, and the amount of amplification they need to sound their best.

For colorway, the new HD58X goes back to the HD580 Jubilee roots and is black with dark grey grills.

For comfort, the pads do soften over time and the headband can be “massaged” by slightly bending the frame to make less clamping force. There are instructions online explaining how to do this.

For amplification, these are a bit easier to drive.  Reports are coming back that these are about 4 decibels louder on portable devices like cell phones.

For the “Sennheiser veil” perceived by some...

New Driver Unveiling

What has not changed in the HD58X Jubilee?

-Still has 38mm dynamic drivers.  
-Still audiophile quality.  
-Same tooling, comfort, interchangeable 600/650/6XX/660S parts in the rest of the headphone.

What is different in the HD58X Jubilee?

-300 ohm resistance lowered to 150 ohms.  
-Voice coil material has changed, it has a lower electrical resistance.
-Diaphragm shape has been revised.
-Different damping scheme and acoustic baffle.

These changes were made to lower impedance (easier to drive) as well as increase the top end of the frequency range.  In the “air” treble region of 12kHz-15kHz, there is better extension as compared to the HD600/650. The bass rolls off a little earlier than typical for the line as a tradeoff for lower distortion in the area. We have requested an increase to bass extension if Sennheiser can do so without any negative effects by the time of production and they have agreed.

These new drivers have been characterized as clearer, faster, and more lively in presentation...without requiring specialized gear.  

Audiophiles like to say that the 580/600/650/6XX “scales well” with better gear.
The HD58X are designed to perform well “out of the box” with almost anything you plug them into.
They're great with your laptop or phone but as with all headphones in this series, you gain a lot by adding a dedicated amplifier.

This driver is closely related to the driver in the new HD660S. EDIT: Same size (both 38mm as confirmed by Sennheiser), same materials, there are some differences in the damping scheme and driver housing.

This is the newest evolution for the line, another beginning deserved by the line-up that started with the HD580 25 years ago.  Add these to your collection to complement HD6XX/K7XX/HE-350 or start your journey here.

Value

The packaging will be simplified to reduce cost.  The 600/650/6XX come in hefty “presentation boxes” which may be piling up in your closet.

With our high volumes and less expensive packaging, we’re able to make this headphone available with a special price on the first drop: $149.99.

After the first drop, the price will increase in future drops. The magnitude of the increase is unclear pending production of the HD58X.

The Massdrop x Sennheiser HD58X Jubilee pays homage to the headphone that started it all and represents the start of the next chapter…
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There are all kind of songs that you can test the performance of the bass. Usually for sub bass i use "Program hostile" song from Crypsis, thickness with "Red water" song from Extize, and energetics + separation in " Eretox 2k" song from Heretik system. Ofc. your choice may differ over styles and personal tastes.
bloodpig
Thank you Sir Pig. I will try those on the PC37X for now until june/july.
Changing HD58x's bass would be a DISASTEROUS choice.

As the name suggests, This drop is to commemorate the Legendary HD580 headphones.
So the sound of HD58x should resmebles the HD580 which had the same tonal balance as the HD600.
But the leaked FR curve of HD58x is more like the HD650 than the HD600.
If HD650 was the target, they should named it 65x, not 58x. Isn't it?
After they changed the bass respones, The name and concept of this headphones become deceptional.

If you want the tonal balance of HD650, We already have HD6xx!
There's no reason to make another heaphones with overlapping, team-killing positions.

The HD580 was not an inferior headphons than HD650.
They are equally great headphones with own unique, unreplaceable characteristics.
But now, it seemes that 58x is desparately imitating hd6xx's responese to become a degraded copy of 6xx.

It is nowhere near to commemorating the legend.
It is a shame.
It is a pathetic humiliation.


There are many people who already have the HD650 or HD6xx before they joined this drop.
Will they be happy to have an inferior version of HD650?
Well, I'm not the one.
If I wanted the HD650, I'll buy an HD650, Not the 58x.

Oh, It is your first Sennheiser and you want 58x to be warmer, bassier headphones?
Well... GO JOIN HD6xx!
WHY NOT?

There are already great, already bassier, already cheap affodable choice in front of your face!
Don't you have extra $30 to join the HD6xx?

I can't understand why the people are whining at HD58x and try to ruin the whole drop.
PFN_K
The treble is clearly different. It will not sound like HD 650.
Tup3x
I know. But that's not my point.
So, I've been threatening to do a bit of a review of the Sennheiser 660s for some little time now, but it seems like it took me FOREVER to find the time to do so.
I'm tossing this out here to the 58X discussions because, essentially, the Jubilee and the 660s are very close to being the same headphone, the drivers are virtually the same with the exception that the 58X drivers are, I believe, 2mm smaller.
I'm going to,(for me), be a bit more brief in this review..... selecting only a couple of musics for the listen, and sticking to 2 amplifiers; the Woo Audio WA2 and the JDS Labs The Element. In this I can address how these sound on both a tube amp and a solid state dac/amp.

By now, most people probably know what is meant by the essential Sennheiser "House Sound", which tends to be, in many of their offerings, a somewhat more forward bass without being muddied, having a moderate bass-veil that does not rob the cans of detail and mid-to-high range clarity. With the exception of the HD600's, one generally cant describe the sound as being neutral, and many folks find the Massdrop-Senn collaboration 6XX's, the HD650's and onward to be good for gaming and more bass-present-preference listens. I'm a solid HD600 aficionado myself, having a love for a more neutral sound that is presented with clarity and detail, yet not sterile or particularly clinical sounding,(as can be the case with Beyerdynamics cans).

The 660s and the Jubilee are a bit of a departure from the Sennheiser House sig, (and build), but not glaringly so. The drivers are built differently from the old standard; you can read the specs on this product description or go to Sennheisers own spec sheet for details,(like impedance, ease of driving, and graphs), so I won't be laying that out here.
These are a touch more clinical sounding,(a slight lean toward the BeyerD SS), yet there is a sweetness to the presentation with beautiful clarity and a smoothly present-without-being-overwhelming bass. These are very clearly not the cans for "bassheads" ; I would not recommend them for dub or gaming, if you really want that overpowering shatter-your-core pound to your sound, for instance.

The musics; I spent a lot of time listening to Glaciation by Patrick O'Hearn and the Bachianas Brasileiras by Villa Lobos, specifically the much celebrated live concert recording of #5 by Anna Moffo in 1963.
I chose these for the following reasons; The O'Hearn album offers a great deal of nuanced and non-digital electric instrumentation that is meditative in nature and where you have presented to you tiny sounds like finger-squeaks on electric guitar strings, the minute pluck of a bass as the only percussion in most pieces.... an almost oozing slice of ice down a mountain-side, as the album title describes. O'Hearn is a bassist, so you know that bass will be present in his recordings, yet he never overwhelms the other instrumentation with it. In some ways, it's nearly jazz.
The Bachianas Brasileiras are a series of nine suites by the Brazilian composer Heitor Villa-Lobos, written for various combinations of instruments and voices, #5 written for an orchestra of 8 cellos and a solo female soprano. With this I am offered soaring soprano vocals backed by the depth of 8-cellos and all that breathing and fibre that goes with this performance.

Listening to the O'Hearn, I am immediately taken by the capability with which these cans are graced in offering up each separate note.....detail, nuance, precision...... each nearly dripping note is sublime. The limited percussion,(sparse, meditative cymbals, and brushed snare), is presented crisply and CLEARLY. I am offered a sense of that ever elusive head-space and instrument placement.....I've read other peoples reviews of these remarking that these headphones can be shrill or overly sparkling in the mids-to-highs, maybe somewhat fatiguing; not my experience, after AMPLE run-in*. There is a mildly sparkling sweetness to the high end, almost reminiscent of the Grado 325 metal-backs,when amped correctly. Lower range extends beautifully.
The Villa-Lobos is admirably presented, again these 'phones demonstrate the vocals and strings very capably and in a very enjoyable way with great detail, yet without harshness.(The BeyerD's can go that road, unless correctly amplified, so I have a comparison available to me for that happening.) One really does get a sense of placement, one hears the intake of breath, the visceral understory from the cellos.

Amping; The WA 2 amp is a VERY nice compliment to these more neutral set of cans, rounding and mellowing what some have described as "shrill"....with The Element solid state amp, in the early sessions I found the lack of the tube-amp "liquification" of the sound to be a little fatiguing. After the cans were "stretched" for a couple days, I found that The Element presented these cans much more appealingly and with great accuracy. Neither amp was overwhelmed by the 660S's demand for adequate power.

Comfort; these are going to feel like the HD600 etc. for fit and the comfort of extended listens. If you have worn the HD600 or 6XX and so on, you know what these feel like. I'm 3 hours in on a session,(while typing here), and I'm not hot or "saddlesore".

The Take-away; If you like a more neutral-yet-nuanced set of headphones, the Sennheiser 660S and the 58X Jubilee might just be the ticket for you. The 58X Jubilee puts a beautiful sound signature within fiscal reach for everybody, while I, a true fan of the HD600 found the expenditure on the 660S totally worthwhile. I also very much love the BeyerD T1 and the DT880,(which I use for musics that demand a more clinical sound),........ I think I can best describe the sound I'm getting from these as being kind of a unique blend of the Senn and BeyerD sound. Kind of a "best of both" version, if you will. Certainly an extension of the Sennheiser line-up.
If you are willing to give these a SOLID run-in before you sit down for a focussed session, I think you will find these pleasing and satisfying for extended listens of Acoustic, Jazz, Live Classical, Studio.
Detail,Clarity, Accuracy, and Range....with, perhaps, an understated-yet-nuanced Bass probably best describes the sound sig of these headphones.
At the 58X price-point, definitely worth a try.

Hope this helps, if they re-drop the Jubilee, or if anybody is curious about trying the 660S.
:)

* AMPLE run-in/burn-in is going to be important to allow these to optimally present themselves. I found that the sound really was MUCH improved after 2-3 days of proper run-in.
when is the next drop?
Those new measurements look incredible, I'm kicking myself for not grabbing this one.
From DIYAudioHeaven today about the FR chart leaked,
" I simply jumped the gun thinking the drop had taken place when I received what appeared to be the production model HD58X. Unfortunately I was not informed the model I received was an evaluation model which has to be approved by Massdrop first before production is started. On request by Massdrop I delayed publication of my findings. Watch the Massdrop site for publication about this. When the cat is out of the bag my findings will be posted here and a more elaborate article in pdf. Both are ready to be published once Massdrop has given the approval for production. "

The leaked FR chart is amazing! I really hope Massdrop approve the evaluation model to be final production model
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Renodoko
My question would be “Is that his measurement of the HD 650, too?“ I like the looks of that FR too, but I’m hesitant to get excited because I’ve seen so much variation between different measurement rigs.
Evshrug
Yep, it's all DIYAudioHeaven data. It wouldn't make sense to make that comparison if it wasn't.
When are these pairs of headphones coming back in stock
Well guys, I have got great news for this thread in a long time! For the first time, we are going to get a glimpse of the graph which contains the measurement of the new pair of production headphones!! So here goes: The light green is the new production version, the red is the preproduction version and the dirty green is the classic hd650. If this graph turns out to be true, then this would be by far, the most dark pair of hd6xx series made by sennheiser which doesn't have their classic veil. Sennheiser has literally increased the sub bass region by 10dB! Ihope you enjoy and like this graph. Thanks
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Don't worry, sennheiser will surely increase the price of this baby when the next drop arrives, no sweat 😊
Soham1255
Lol, I don’t mind either way. I’ve transitioned from a “Holy Grail Headphone Seeker” to more of a collector of many flavors. I used to be a bass-lite kind of guy, but I’m pretty open minded (or at least I like to think I am).

Once this production version is released, I don’t think Sennheiser will change the sound unless they rename it.

edit: Oh, I thought you said Bass, not price, haha. Yeah, they already said the price would go up, but probably still a bargain.
If the bass on the HD58X does come across on the light (underwhelming) side the Dekoni standard (no additional cost option) ear pads might be something to consider. I found that these Dekoni pads increased and tightened the bass on my HD650. Be aware though that theses pads also moved the soundstage a bit forward as compared to the stock pads.
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I just got a bunch of HD 600 series pads, so I’ll be able to hear for myself. I was asking Tuneslover because it isn’t immediately clear which Dekoni pads he got.
Evshrug
No worries. Dekoni has released measurements if you're curious between them as well: https://dekoniaudio.com/frequency-response-curve-new-dekoni-sennheiser-hd600-pads/.