Sennheiser HD 660S2

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Overall

#33 in

Headphones (Over / On Ear)

according to Reddit Icon Reddit

Sentiment score71% positive
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25
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Top Pros

Top Cons

Last updated: May 10, 2026

Reddit Reviews

Reddit Icon777navmk
Reddit IconaceCrasher
4 months ago

Thats so funny because its the other way around for me. I sold my Arya Stealth to buy a 660S2.

Reddit IconAdAdditional8414
6 months ago

hd550 is a fairly affordable and safe pick imo. If you don't mind eq the 560s is another good set. If you love vocals get something from the hd6-line. HD660S2 can be found anywhere near $400 these days

6 months ago

hd550 is a fairly affordable and safe pick imo. If you don't mind eq the 560s is another good set. If you love vocals get something from the hd6-line. HD660S2 can be found anywhere near $400 these days

Reddit IconAdditional_Cloud_468
6 months ago

Totally fair question wanting solid bass doesn’t make you any less of an audiophile. You can absolutely have clean, rich low-end without sacrificing clarity or soundstage. The trick is finding open-back headphones that have a slightly warmer tuning or respond well to EQ. If you like the idea of the HD660S2, they’re excellent for detail and balance, but they’re not what most people would call bass-heavy. You might prefer something like the Beyerdynamic DT 1990 Pro (with the “balanced” pads) or the **HIFIMAN Edition XS** both deliver tight, extended bass while keeping the mids and highs open and spacious. The **Focal Elex** is another great option if you can find it; it has a punchier low end and a very engaging sound. Also worth noting, open-backs will never hit as hard as closed-backs in terms of sub-bass impact. If you want a bit more weight, a mild EQ boost around 60–100 Hz can do wonders without distorting the sound. So yes, you can definitely have that “best of both worlds” setup just look for headphones with a naturally warm tuning or pair them with a good DAC/amp and subtle EQ adjustment.

Reddit Iconadelkkhalil
9 months ago

I got and returned the 109 Pro after few weeks. They are super comfortable, nice sounding and that is it. They are nice they didn't do much for me no complaints it just OK. I found my self going back more and more to my older Arya Stealth and 6xx. Obviously everyone is different but I think under $1000 there is much better at least objectively better headphones and you can listen to them first. Focal Clear, Arya Stealth, LCD-2C (used) I would even throw in 660S2. All these to me sounded better than 109 Pro.

Reddit IconAdmiral_Ackbar_1325
2 months ago

I did, but it didn't seem to help much. The biggest issue for me was lack of bass impact and definition. I know that on a graph these technically have more bass than a 660S2 but I honestly couldn't hear it. I actually prefer the bass on the 660S2's.

Reddit IconAlphaomegalogs
6 months ago

I've tried the HD660S2, it did not impress me compared to the HD800s, I auditioned them back to back. My reaction to the HD660s2 was something along the lines of "Better bass better imaging version of the HD6XX (which are a third the price)." My reaction to the HD800s was... well I had no words I was blown away and moved to tears.

Reddit Iconalpinvs
about 2 months ago

veiled uppers, the smushed soundstage, a lack of low end rumble If those are your concerns with HD 6xx, you'll find Sennheiser HD 490 Pro suits more to your preferences, depending on how much bass we're talking about. Bass is stronger than the HD 6XX but if you want really strong bass, sounds like you have to go for planars or even some closed ones. I can only talk about headphones that I own, though. HD 560s or HD 400 Pro (they're identical) also have the kind of sound profile similar to HD 490 Pro and you can find good deals for them. I haven't heard the new HD 505 and HD 550. Fiio FT1 got great bass but you may find them a bit dark, seeing how you evaluated the treble on HD 6xx.

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