Sennheiser HD 660S2 Review: Refining the 600 Series Legend
Explore the Sennheiser HD 660S2 review. Learn how this 300-ohm headphone refines the 600 series legend with improved sub-bass performance and a technical pivot.
Best quote from Sennheiser HD 660S2 Review: Refining the 600 Series Legend
The HD 660S2 is the 'posh slipper' of audio, designed for long, fatigue-free sessions where you want the refined sub-bass and holographic imaging of the 600-series legacy without the 'shoutiness' of the classics.
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Evolution and popularity of Sennheiser HD 660S2 headphones
Frequently Asked Questions
The Sennheiser HD 660S2 was designed as a direct response to years of fan feedback regarding the legendary 600 series. The most significant refinement is the improved sub-bass performance, addressing a long-standing complaint from the audiophile community. By focusing on this specific frequency range, Sennheiser aims to provide the 'silver bullet' solution that maintains the classic magic of the series while offering a more complete and modern sound profile.
In a strategic technical pivot, Sennheiser returned to a 300-ohm impedance for the HD 660S2, moving away from the 150-ohm driver found in the original HD 660S. This shift marks a return to the high-impedance roots of the 600 series. While the lower impedance of the previous model made it easier to use with mobile devices, the S2 is specifically optimized for high-quality desktop setups to achieve its refined audio performance.
The Sennheiser HD 660S2 is viewed as a seismic shift for the 'royal family' of audiophile headphones. Released in early 2023, it balances the traditional characteristics that made the 600 series famous with modern technical upgrades. By revisiting high-impedance drivers and focusing on sub-bass, the HD 660S2 acts as a refined successor that honors the series' history while meeting the demands of contemporary audio enthusiasts.
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From Columbia University alumni built in San Francisco
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
