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Oppo PM3 Closed-Back Planar Magnetic Headphone - Blue vs Sennheiser HD 660 S - Dynamic Open-Back Stereo Headphone

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.

Oppo PM3 Closed-Back Planar Magnetic Headphone - Blue Oppo PM3 Closed-Back Planar Magnetic Headphone - Blue oppo Out of stock at every tracked store Lowest ever ₹39,999 on Saturday, 12th Sept, 2026 ★★★★★ 4.8 4.8 · 470 reviews Full prices & history
Sennheiser HD 660 S - Dynamic Open-Back Stereo Headphone Sennheiser HD 660 S - Dynamic Open-Back Stereo Headphone Sennheiser Now ₹39,990 at AVStore Lowest ever ₹33,718 on Sunday, 4th Oct, 2026 ★★★★★ 4.8 4.8 · 470 reviews Full prices & history

Measured tuning, side by side

Both curves are real community measurements (gold: Oppo PM3 Closed-Back Planar Magnetic Headphone - Blue · ink: Sennheiser HD 660 S - Dynamic Open-Back Stereo Headphone). Each is level-aligned to its own 200 Hz–1 kHz mean, so rig offsets don't skew the comparison.

201001k10k17-1-20
Oppo PM3 Closed-Back Planar Magnetic Headphone - Blue Sennheiser HD 660 S - Dynamic Open-Back Stereo Headphone
Tuning distance±5.78 dB RMS65% match - Close. Computed on a shared 40-point log grid, 20 Hz–10 kHz. A measurement-space fact, not a promise two ears agree.
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.

The decision, factually

Cheaper right nowSennheiser HD 660 S - Dynamic Open-Back Stereo HeadphoneLowest current price across all tracked stores.
Deepest discount ever seenSennheiser HD 660 S - Dynamic Open-Back Stereo HeadphoneFrom each product's own recorded price history.

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