Worst case scenario is that the drivers need to be replaced, and the closest thing to original HD580 drivers that Sennheiser still produces today, are the HD600 drivers. Allegedly with new production HD600 drivers, the resulting sound will vary only a slight amount at most compared to the originals, likely an insignificant amount.

All of those who followed the wonderful journey into the world of headphones inevitably bumped into and listened to the Sennheiser HD 600 or HD 650 at least once. They quickly became so popular and widespread that we considered a dedicated review unnecessary.


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When changing the HD 650 with the HD 660S after a non-stop 2 hour listening to the HD 650, I can feel that the veil has lifted, the mid-bass stops rattling and clipping and the harmonic distortion feels lower.

Despite their well known qualities, both HD 650 and HD 600 have never been praised for their quick transients. Their sound is soft and slow, lacking in speed even paired with a fast solid state amplifier.

If you carefully listen to fast electronic music on the HD 650 or HD 600, you can hear a micro-echo, like an unpleasant resonance, maybe and effect of the over-damping behind the diaphragm (again just a guess). This effect damages the delimitation of notes and each individual sound end up not being sufficiently well defined.

I now realize that none of the models in the HD 6xx series, including HD 660 S, offers a convincingly large and expanded enough soundstage. The soundstage is somewhat compact and intimate, but surely not claustrophobic. I would categorize it as a medium-sized soundstage, not too large (like HD 800), but also not so close as to make me feel on the stage with the band.

I sincerely think this is the biggest drawback of these headphones, maybe the only drawback that caught my attention on the HD 660 S as well as on all other dynamic driver Sennheiser models: the sub-bass starts to distort beyond 95dB of volume. I think this problem is not even present for an untrained ear. My father still claims the HD 650 sounds crystal clear, so it depends on the listener.

Listening to Pink Martini and Lorena McKennit it becomes crystal clear that this kind of music was created for the HD 660 S. The warm voice simply touches your soul and the instruments become a game of the imagination.

The highs presented themselves clean and airy, with a good balance between technical show-off and naturalness. The highs are somewhere in the middle, not overly natural, but also not overly bright and sibilant.

Out of curiosity, I connected them to a dedicated mid-range DAP, FiiO X3 MKIII, on the single ended 3.5mm and it sounded more than decent. The headphone came alive even on the little X3. The high-end players would surely deliver even more performance.

The HD 650 loses the tonal balance quickly, overemphasizing the mid-bass and cutting out the high treble. The overly forward mids crowd the soundstage a little bit, the sound becomes a bit claustrophobic, especially on bad mastered music. The HD 650 sounds a bit slower and veiled, the definition of musical notes is less outlined and a micro-echo comes to the mix, together with a bothering distortion.

The mids again are very similar, with the HD 660 S being a bit cleaner and better defined. I can hear the string vibration and the decay of the vibration more clearly, the HD 600 masking these subtle details.

The bass is a different story. The HD 600 has a weaker bass and the HD 660 S has a deeper and faster bass. The bass is the only area where the harmonic distortion can become a problem, especially if you tweak the EQ too much. The HD 660 S scales much better in this regard, offering a lowered harmonic distortion in this area.

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Sennheiser spare part number 534409. Available in original Black finish only. Please note this item is supplied individually. If you need to replace the capsules / drivers in both ears, please order two units.

Much has already been said about the headphones being measured today. The Sennheiser HD650 was originally released back in 2003. Of interest historically, there was a fire in the Ireland factory back in 2004 so there probably are not many older pre-fire HD650's floating out there. Tyll Hertsens' article about the Sennheiser HD580/600/650 is a great summary and SolderDude has a ton of stuff on the HD650 on DIY-Audio-Heaven. SBAF has this "compendium" on the HD650 which I think covers everything... and more! Oh yeah, even NwAvGuy got one of these back in 2011.

Likewise, you already no doubt would have read about the Sennheiser HD800 over the years. These came out in 2009, sporting the large 56mm "ring radiator" driver (vs. 42mm transducer of the HD650). The HD800 has since been revised with the HD800S in 2016 (here's Tyll's take with mods discussions). Multiple reviews on Head-Fi. The HD800S sounds very similar to the HD800 to me.

My friend linnrd bought this headphone back in 2013 used and was able to lend them to me for a listen. Peeking behind the metal grille in the image above, we see that this is not the oldest version based on the color of the driver surrounding material which is silverish/white rather than the pre-2010 version that would have been all black (based on a comment here). So based on this, unless there is a more precise way to find manufacturing date using the serial number (1409XX), this specific headphone was "Made In Ireland" at some point likely between 2010-2012. (I've sent an E-mail to Sennheiser with the serial number, will update if they send me more info.)

The 2-pin cable connectors to the ear pieces are easy to remove and replace. I'm somewhat envious of how inexpensive balanced cables are for these HD650 headphones as opposed to the significantly higher price for HD800's (even generics)!

They feel quite comfortable and light (260gm without cable) when worn but that's variable depending on one's head shape and size of course. Clamping force is stronger than the HD800. I measured these with the stock pads on, and while many years old I don't think the headphones have been used too much and the pads look to be in good shape, are clean, have maintained "springyness", and with no noticeable wear/tear of the velour material.

I seem to be having a problem with my PC 363D G4ME sound card/ driver. Basically every time I restart my PC the blue LED on the sound card that indicates that dolby surround sound is on disappears along with the driver application in the system tray. But when I uninstall my driver in windows add/remove the led and application come back again.

is it enabled? have tried unpluging the headset uninstalling the drivers and then restarting and reinstalling without the head phones plugged in? If you have tried reinstallation I would check out your enabled devices i usually have to disable everything that isn't plugged in and/or being used to my sound to run correctly (i dont have sennheiser anything).

Last night my HD650s started to buzz really badly in the left ear when low frequency bass played. I tried gently blowing out any hairs that may have been touching to driver and used tweezers to remove any debris from the foam pad protecting the driver but it still buzzed.

Today I pulled the whole left piece apart and removed a hair touching the driver where blowing would not have dislodged it. I also noticed that the driver "lollypop" wasn't completely clipped in. Still buzzed.

I thought I had accidentally blown my left driver by plugging them in before the 2min warmup time for tube amps that I've read about today (tube amp is a Bottlehead Crack and I was using the O2 for testing).

Would advise against blowing into the drivers and or vacuuming. The headphone diaphragm can invert when you do this and you'll notice severly reduced output until you blow from the other side of the driver and get it back in place.

Thanks for linking to those images. I'll disassemble the headphones again later and see if I can isolate what part is loose or not seated properly. 


On the plus side it is a very easy set of headphones to disassemble! 



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I have experienced issues with Plantronics USB headsets, over time it gets static and garbled. My solution, unplug the headset, then plug it back in. The issue arises after a few hours, so I have conditioned myself to go through this routine before doing soft phone calls.

Just curious if anyone has figured out a way to keep USB Audio stable (especially if the CPU is under load). I raised a ticket with Apple and they were quite helpful, we replicated, took log file dumps, etc. They kicked it up to engineering who came back with confirmation that they see the problem but that it's related to the vendor of the audio device and that it's their driver that's bad. The thing is i'm using the out-of-box generic usb audio drivers so clearly the vendors don't see it as their issue. The support rep seemed to agree but said he'd done all he could as engineering wasn't listening.

Very bad outcome for everyone having problems with USB headsets....I have spoken with Sennheiser if they can provide any update but they said the headset is using no driver cause it's relies on the general USB driver from the operating system....

check with the developers webpage on these issues. I have had issues with line 6 audio in 10.11 and Line 6's response has been they are experiencing issues with 10.11's toolset and working with Apple but at this time they have not fully resolved audio issues. This is particularly concerning in light of a number of posts that are exclusive to audio software or hardware devices having problem is El Cap. 152ee80cbc

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