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What's the point in buying a HD 660S then??? loling...
For people that listen with mobile phones and mp3 players that don't require an amp to sound their best.
Sennheiser introduced the HD660S as a product improvement to replace the HD650. The HD660S sound signature is a bit different compared to the HD650, plus the drivers themselves are based on the HD700, albeit with some tweaking. Reports so far show more sub-bass and more detailed highs. Also worth mentioning is that the HD660S has a lower impedance (150 ohms vs 300 ohms) and requires less amplification.
Always nice to see a familiar name ;-)
Jokes aside, we are continuing to sell the HD 650 alongside the HD 660 S for the foreseeable future... because they are still needed in studios for consistency, and of course the community still loves them. Same story for the HD 600! And even if we decide to discontinue selling new sets of old headphones, we will have repair replacement parts for a good while.
The HD 660 S was actually tuned to have the same frequency response curve as the HD 650, but with a new driver based on our advancements from higher end models (like the HD 700 and 800) to deliver higher resolution and transient response, with less distortion. We love the HD 650’s tuning, but we found that we can apply our accumulated knowledge to create a better performing HD 650. In the 14 years since the release of the HD 650, we have changed our measurement coupling, but the HD 660 S is more efficient to drive (half the Ω impedance and more sensitive).
We also include balanced cable in a pentaconn 4.4mm termination, which pairs great with our HDV 820 fully balanced DAC/amp, but also provides versatility with some of the high quality Digital Audio Players emerging on the market (Sony, Acoustic Research, and hopefully more to come). Our new IE 800 S also comes with a Pentaconn Cable, and we are looking to see how well the connection is received by the community.
With the high performance but closely matched FR of the HD 660 S to the classic HD 650, we are eager to continue reading sound impressions from all over the world! Meanwhile, the Massdrop Edition HD 6XX has increased the accessibility for more people to hear for themselves what our former production flagship is all about.
Thanks for the clarification. I really want to get my hands on the HD660S but can't justify the $500 price tag when the HD650 (which I already own) sells on Amazon for $315 regularly, plus the $200 HD6XX version here on Massdrop. I'm hoping to see more realistic pricing on the HD660S soon or maybe catch them on sale. I'd love to compare the new HD660S with my HD650s and share a quick writeup.
Don't expect the new HD 660S to decrease in price in the next few years. It is basically the 3rd iteration of the HD 6-- series (not including the HD 580) and sounds very similar to the HD 650/6XX in an easier to drive package.
For those curious or on the fence about which one the get, the debate still lies between the HD 600 (neutrality) vs HD 6XX/650/660S (more fun). Since the 6XX is exactly the same as the 650, why would someone not pay $$$ less and since the HD660S is a moneygrab attempt at new Sennheiser customers who aren't into the whole amping audiophile gig yet, why would anyone pay $500 when the HD6XX exists.
In short, it comes down to HD 600 vs HD 6XX. Ignore the rest. I prefer the HD600 sound, but the HD6XX is an astoundingly good deal and I would have gotten it in a heartbeat if I didn't have my baby HD600 already.