Sennheiser HD 650 Headphones - Open Box vs Sennheiser HD 660 S

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.

Sennheiser HD 650 Headphones - Open Box Sennheiser Out of stock at every tracked store Lowest ever ₹33,595 on Thursday, 1st Oct, 2026 ★★★★★ 5.0 5.0 · 3 reviews Full prices & history

Sennheiser HD 660 S | Open-Back Dynamic Headphones

Sennheiser HD 660 S Sennheiser Now ₹39,599 at The Revolver Club Lowest ever ₹33,448 on Sunday, 13th Sept, 2026 ★★★★★ 5.0 5.0 · 1 reviews Full prices & history

Measured tuning, side by side

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

Sennheiser HD 650 Headphones - Open Box Sennheiser HD 660 S

Tuning distance±3.10 dB RMS81% 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 SLowest current price across all tracked stores.

Deepest discount ever seenSennheiser HD 660 SFrom each product's own recorded price history.

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