Sennheiser HD 660S2 audiophile headphones now available for $427.35

A $13.23 discount that's hard to ignore.

Sennheiser HD 660S2 - Audiophile Open-Back Over drops to $427.35 - save $13.23. That puts these open-back headphones below their 30-day average of $440.58, a rare mid-cycle dip for one of Sennheiser's most respected audiophile models.

If you have been waiting for a reason to upgrade your listening setup. This is it.

THE DEAL

Sennheiser HD 660S2 - Audiophile Open-Back Over

$427.35 (was $440.58) - Save $13.23 (3% off)

Where: Amazon

ExpiresNo end date listed

Get This Deal

For just $427.35, below its 30-day average of $440.58. The 90-day average sits at $438.51 and the 180-day average is $442.57, so this price is genuinely lean for current market conditions.

Sennheiser rarely discounts its audiophile-grade open-back cans outside seasonal events, making this a straightforward value play for anyone serious about sound.

What You're Getting

The HD 660S2 delivers natural, high-fidelity audio with a spacious soundstage that makes long listening sessions genuinely immersive. Ultra-light aluminum voice coils paired with 42mm transducers produce detailed highs, rich mids, and deep, controlled sub-bass. The open-back design breathes, and plush ear cushions keep fatigue at bay during hours of use. Built in Germany and Ireland, these are wired over-ear headphones built to last.

Who This Is For

Best for audiophiles and critical listeners who want reference-grade sound without stepping into four-figure territory. Also a strong pick for gamers who value positional audio and studio-quality imaging over gimmicky surround processing.

If you are happy with budget or mid-range headphones, these are overkill, but if you hear the difference, you will not want to go back.

Final Verdict

A straightforward price cut on one of the best open-back headphones under $500. If you need detailed soundstage and bass extension that most competitors at this price cannot match, buy now.

If you already own the HD 660S or a comparable planar magnetic set, there is no rush.