Master & Dynamic MH40 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.

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Open head-to-head

Master & Dynamic MH40 - Over-Ear Headphones master Out of stock at every tracked store Lowest on record ₹27,999 on Saturday, 12th Sept, 2026 ★★★★★ 4.8 4.8 · 470 reviews Full prices & history

Sennheiser HD 660S2 Dynamic Open-back Headphones Sennheiser Now ₹27,990 at Headphone Zone Lowest on record ₹680 on Thursday, 5th Nov, 2026 ★★★★★ 4.8 4.8 · 34 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 master Sennheiser

Driver configuration Dynamic (DD) Dynamic (DD)

Impedance 32Ω 300Ω

Connectivity Wired Wired

Form factor Over-ear —

Back design — Open-back

Plug — 4.4mm balanced

Measured tuning, side by side

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

master Sennheiser

Average level per band, relative to that curve's own 200 Hz–1 kHz middle - a taller bar plays louder there on the measured files. Same colours as the chart above.

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Hear them side by side

Signal A B

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Your earphones / headphones

Wearing your own earphones or headphones? Pick them here and the player pre-corrects for their sound, so the demo plays the target tuning itself - not both mixed together.

Same signal through both tunings at once - slide to blend. Start on pink noise for the clearest read.

Tuning distance ±4.80 dB RMS 71% match - 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 master +5.5 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means master plays louder there on the measured files; minus means Sennheiser does.

Mids · 250–2,000 Hz master −0.3 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means master plays louder there on the measured files; minus means Sennheiser does.

Treble · 2,000–10,000 Hz master −0.8 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means master plays louder there on the measured files; minus means Sennheiser 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.

Master & Dynamic MH40 - Over-Ear Headphones No tracked offer in stock In stock at 0 tracked stores

Sennheiser HD 660S2 Dynamic Open-back Headphones Now ₹27,990 at its 30-day median Lowest on record ₹680 on Thursday, 5th Nov, 2026 In stock at 7 tracked stores

Price gap right now n/a Both sides need a tracked offer to compare.

Stores with it in stock 0 vs 7 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 660S2 Dynamic Open-back Headphones Lowest current price across all tracked stores.

Deepest discount ever seen Sennheiser HD 660S2 Dynamic 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: master EQ preset: Sennheiser All Headphones More comparisons