[MacMan31]

To begin with, the pads are intended to hold their shape (and sound) for as long as possible. Do nothing to accelerate the "brake in" or increase their compliance. It will happen anyway eventually and gradually but the point is to preserve their properties. When they become soft and loose their initial depth it's time for replacement. The sound however will not be very different.
To restore the metallic grill you will have to remove it and press the indented point of the grill from inside with your thumb. See in youtube how to open an HD-6## series unit. It is very easy and it starts with removing the plastic yoke. You will also remove the lower semi-oval frame that looks like an extension of the yoke and accepts the cable in its middle point. It"ll be relatively easy.

I don't mean just the ear pads. It's the headband pad also. All the pads are basically like I have rocks on my head. I really think Sennheiser should have changed their pad design and materials to a much more comfortable option. I'm sure they could have figured out how to do that without altering the sound signature of the headphone. I remembered I had a Dekoni headband pad for the HD6 series so I swapped to that and it works better.

 

[Plieb]

They've been at $399 on Amazon for quite a while.

Also was 399 at sennheiser with no shipping cost. Usually sennheiser dictates the cost of all other sellers. Waiting for another 399 sennheiser sale and will buy at that time.

 

[Rob80b]

I'd be interested at ~$400.
$600? A bit too overpriced in my opinion.

Yep...https://www.sennheiser-hearing.com/en-US/audiophiles-headphones/home-listening/

They've been at $399 on Amazon for quite a while.

Interesting that the price went back up, here in Canada Senn has them at $799 again??, thought they'd remain at $599 Can or lower.
https://www.sennheiser-hearing.com/en-ca/audiophiles-headphones/home-listening/


Amazon also followed...
https://www.amazon.ca/Sennheiser-660S2-Audiophile-Headphones-Transducer/dp/B0BRT1ZN7Q/

 

[MacMan31]

Yep...https://www.sennheiser-hearing.com/en-US/audiophiles-headphones/home-listening/

Interesting that the price went back up, here in Canada Senn has them at $799 again, thought they'd remain at $599 Can or lower.
https://www.sennheiser-hearing.com/en-ca/audiophiles-headphones/home-listening/


Amazon also followed...
https://www.amazon.ca/Sennheiser-660S2-Audiophile-Headphones-Transducer/dp/B0BRT1ZN7Q/

As a fellow Canuck I'm not surprised. The cost of everything here is outrageous.

 

[michael2v]

My other option would be to get a used pair of the HD650, but I'm leaning more towards the S2.

If you’re looking for more bass, definitely go with the S2.

 

[mdotdub]

If you’re looking for more bass, definitely go with the S2.

I second this response. I had the 650 and returned it and got the 660S2. For me, the bass was so much better. I'm much happier with the S2.

 

[MacMan31]

I second this response. I had the 650 and returned it and got the 660S2. For me, the bass was so much better. I'm much happier with the S2.

I think I'm the opposite. But more so with respect to the mid range. I think I prefer my 650/6XX over the 660S2. On the S2 I find the mids to be forward in a way that seems shouty whereas my 6XX seems more balanced. I may end up selling my 660S2. I don't need three HD6 series headphones (also have the 600).

 

[Tripokaridos]

So I have a set of HD660S V2 on the way. What can I expect over the 6XX/650 or 600? I have both of those right now.

In my opinion... U should expect the same sound signature that all HD 6 series have with some small tweaks . My 6xx and 650 had some small difference, I kept the 650,600,660s,s2 only and not Drop for collectable reasons .
ABout Sound HD 600 again ( in my opinion) have the capability of creating a beautiful bubble of vocals and they are kings on that, HD 650 are the warm smooth kings that every bad recording sound so relaxed and unbiased realistic , HD 660s are the ones that start to give u something different , speed, separation,imaging , liveness , a bit bigger soundstage , vocals are now not in bubble and the instruments are more in front , they lose something of the HD 600 and 650 natural character and win something else.
660s2 they kept the amazing 660s imaging, seperation, speed , but they had more low end and to my ears a smoother up range they have a Relax warm tone like 650 but giving to us in a different way ... clarity texture is there.
For me is hard to choose because i love all of them , but i know that technically 660s2 are better than the others for sure , and its all about the sound signature that some may like or not. Also all of them need a lot of time and a lot of side by side and test them with different kind of music and dac amps to see what u like more , Me personally wanted time because every time i went from 600 to 650 or from 650 to 660s always i liked more the ones that my Brain learn to listen ...For example going from 600 to S2 at first was like some clarity is missing , but that was not the case it was there but present in a different way that my brain had to adjust .

At the end all i say to most people that love hd6 line is , Keep one of (600 or 650) and one from (660s or s2) unless if u have tried all of them and u really know what u prefer.

 

[steve468]

Yep...https://www.sennheiser-hearing.com/en-US/audiophiles-headphones/home-listening/

Interesting that the price went back up, here in Canada Senn has them at $799 again??, thought they'd remain at $599 Can or lower.
https://www.sennheiser-hearing.com/en-ca/audiophiles-headphones/home-listening/


Amazon also followed...
https://www.amazon.ca/Sennheiser-660S2-Audiophile-Headphones-Transducer/dp/B0BRT1ZN7Q/

Just got a pair from Bay Bloor Radio for $549 - listed at $649 on their website

Sometimes it pays to go to the sleepy old brick and mortars.

 

[Rob80b]

Just got a pair from Bay Bloor Radio for $549 - listed at $649 on their website

Sometimes it pays to go to the sleepy old brick and mortars.

Or just wait....not the 1st time we have seen this swing, now back to $549.


But the difference is only the price for a night out for 2. : ( Headphones relatively speaking are cheap, affordable : )

 

[steve468]

Or just wait....not the 1st time we have seen this swing, now back to $549.


But the difference is only the price for a night out for 2. : ( Headphones relatively speaking are cheap, affordable : )

Good food and drink is only for a little bit. Good headphones are forever! I always try to sell my wife on the cost per hour of enjoyment, that way they do sound cheap. (Also I can never tell her how much I actually spend on audio.)

 

[Luckyleo]

Good food and drink is only for a little bit. Good headphones are forever! I always try to sell my wife on the cost per hour of enjoyment, that way they do sound cheap. (Also I can never tell her how much I actually spend on audio.)

 

[Xerosnake90]

Finally downloaded a FLAC of Nobuo Uematsu's "The black mages", something I've been enjoying on my 660s2 through a low quality YouTube stream.

Just showcases how incredibly immersive this headphone is. I keep praising the staging and imaging and it needs to be repeated. You can follow any one instrument a whole song through. Two center images share a space and play along together. You can hear the ambient synth stuff in the back while several well placed instruments dance back and forth.

I've been wanting a tube amp but can't justify the cost right now. Good thing I really enjoy the Lyr+