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.

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.

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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.

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! 

Sent from my iPhone using Tapatalk

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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).

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.

The Sennheiser website is no help that I can see. I have emailed them, and will see what transpires. As cragem said above, they's probably say it's Apple's problem, but the more noise people make the harder they will push Apple for a fix, I hope.

I just got off the phone with Sennheiser. Basically, they are not aware of the issue and they very clearly stated it's "an Apple issue" which I guess sort of make sense because it's a driverless product and it worked just fine under Yosemite. The only way Sennheiser could fix it would be to either release a driver for a product for which they have never written a driver or to replace everyone's headset with a model that somehow works around what's probably a bug in Apple's OS (I've heard grumblings of other USB audio issues with El Capitan).

Either way, I'll be buying a bunch of headsets today from another manufacturer. If Sennheiser support is unaware of the incompatibility, it definitely sets the tone that they don't care too much about Apple users. The tech even asked me if I tried plugging the headset into a Windows machine to make sure it worked right. So apparently in Sennheiser terms, "works right" means works with Windows.

Thanks for your update, Steve. To be fair to Sennheiser it seems fair enough to test the headset by plugging it into another machine, but apart from that I agree absolutely with your summary. I had a prompt and polite email reply from someone at Sennheiser who did not seem to be aware of any issue related to El Capitan, so I've pointed them to this thread.

I'm only one day in, but the Logitech ClearChat Comfort/USB Headset H390 seems to be working just fine. It's heavier than the Sennheiser PC8, but a little more comfortable on the ears. It appears to have just slightly poorer mic, but does the job. At least so far today has had zero issues with El Capitan on a few video conferences and a test in Audacity. No crackles.

After a couple of days' use I'm well pleased with the Logitech H390 headset. That said, I haven't tested it extensively to see if USB audio performance falls off over time. I never noticed that in the past with the Sennheiser headset, but then I don't tend to record or dictate for long periods.

The H390 is more substantial than the Sennheiser PC8, quality for dictation (I'm using it now) and Skype seems good, and I like the way the volume control adjusts the system volume on my Mac. The little volume control gadget is a bit plasticky, and the main cable is heavier than I'd like, but overall it was a good buy (20 for a good used model on Amazon). 152ee80cbc

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