Sennheiser HD 650 Open vs Sennheiser HD 660S2

Every tracked fact about the two, side by side - prices, history lows, ratings and measured tuning. No verdict: which one to buy is the visitor's decision, always.

Not this pair? Swap either side:

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Open head-to-head

Sennheiser HD 650 Open Back Headphones Sennheiser Now ₹23,990 at Headphone Zone Lowest on record ₹23,553 on Thursday, 22nd Oct, 2026 ★★★★★ 4.9 4.9 · 79 reviews Full prices & history

Sennheiser HD 660S2 Headphones - Open Box Sennheiser Now ₹42,835 at Moon Audio Lowest on record ₹31,120 on Thursday, 22nd Oct, 2026 ★★★★★ 4.7 4.7 · 3 reviews Full prices & history

What is being compared

Both sides are headphones. The rows below are the facts each store publishes for this shelf - driver setup, impedance, sensitivity, back design and connectivity. A dash means the listing does not state that spec.

Spec Sennheiser HD 650 Open Sennheiser HD 660S2

Impedance — 300Ω

Connectivity Wired Wired

Back design Open-back —

Measured tuning, side by side

Both curves are real community measurements (gold: Sennheiser HD 650 Open · ink: Sennheiser HD 660S2). Each is level-aligned to its own 200 Hz–1 kHz mean, so rig offsets don't skew the comparison.

Sennheiser HD 650 Open Sennheiser HD 660S2

Tuning distance ±1.65 dB RMS 90% match - Very close. Computed on a shared 40-point log grid, 20 Hz–10 kHz. A measurement-space fact, not a promise two ears agree.

Bass · 20–250 Hz Sennheiser HD 650 Open +1.2 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means Sennheiser HD 650 Open plays louder there on the measured files; minus means Sennheiser HD 660S2 does.

Mids · 250–2,000 Hz Sennheiser HD 650 Open −0.4 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means Sennheiser HD 650 Open plays louder there on the measured files; minus means Sennheiser HD 660S2 does.

Treble · 2,000–10,000 Hz Sennheiser HD 650 Open +0.9 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means Sennheiser HD 650 Open plays louder there on the measured files; minus means Sennheiser HD 660S2 does.

What a curve cannot seeBuild, driver QC unit-to-unit, comfort, isolation, accessories, warranty and resale value sit outside the graph - usually what the pricier one is charging for.

Price over the last 30 days

Daily lowest price across every tracked store, from the site's own price history. The line is one product's own range - the two cards are not drawn to a shared scale.

Sennheiser HD 650 Open Back Headphones Now ₹23,990 at its 30-day median Lowest on record ₹23,553 on Thursday, 22nd Oct, 2026 In stock at 4 tracked stores

Sennheiser HD 660S2 Headphones - Open Box Now ₹42,835 36% above its 30-day median Lowest on record ₹31,120 on Thursday, 22nd Oct, 2026 In stock at 1 tracked store

Price gap right now ₹18,845 44% of the dearer one's price.

Stores with it in stock 4 vs 1 Active stores carrying each one right now - more stores usually means easier replacement and a steadier price.

The decision, factually

Cheaper right now Sennheiser HD 650 Open Back Headphones Lowest current price across all tracked stores - ₹23,990 vs ₹42,835.

Deepest discount ever seen Sennheiser HD 650 Open Back Headphones From each product's own recorded price history.

This page reports facts and expresses no opinion on which to purchase.

Keep going

EQ preset: Sennheiser HD 650 Open EQ preset: Sennheiser HD 660S2 All Headphones More comparisons