Sennheiser HD 660S2 vs Sony WH-1000XM6
The Verdict
The Sennheiser HD 660S2 and Sony WH-1000XM6 sit in the same category and end up appealing to slightly different buyers. Both launched at roughly the same price ($499 vs $450), so cost is unlikely to be the deciding factor. The Sony WH-1000XM6 is the newer release, which usually means a faster chipset and longer software support. Sennheiser HD 660S2 stands out for reference-grade sound with improved bass over the original hd 660s, while Sony WH-1000XM6 is praised for qn3 processor delivers industry-leading anc. Use the side-by-side spec table below to compare cameras, displays, battery life and connectivity in detail and decide which one fits your priorities.
Who Should Buy
Buy the Sennheiser HD 660S2 if…
- →Reference-grade sound with improved bass over the original HD 660S
- →Both 6.35mm and 4.4mm balanced cables included in the box
- →Open-back design creates a wide, natural soundstage
Buy the Sony WH-1000XM6 if…
- →QN3 processor delivers industry-leading ANC
- →40-hour battery life with ANC
- →Foldable design returns (compact case)
Pros & Cons
Sennheiser HD 660S2
Pros
- Reference-grade sound with improved bass over the original HD 660S
- Both 6.35mm and 4.4mm balanced cables included in the box
- Open-back design creates a wide, natural soundstage
- Lightweight at 260 g for an audiophile over-ear
- Replaceable parts make it a long-term investment
Cons
- 300-ohm impedance requires a dedicated amp/DAC to drive properly
- Wired only — no Bluetooth option
- Open-back leaks significant sound — not for shared spaces
- $499 is steep for headphones that need additional equipment
Sony WH-1000XM6
Pros
- QN3 processor delivers industry-leading ANC
- 40-hour battery life with ANC
- Foldable design returns (compact case)
- LDAC + LC3 codec support for hi-res audio
- Charge while listening via USB-C
Cons
- $450 is $50 more than XM5
- 230g is still heavier than some competitors
- No aptX Lossless support
Full Specifications
| Spec | Sennheiser HD 660S2 | Sony WH-1000XM6 |
|---|---|---|
| Active Noise Cancelling | ||
| Type | over-ear | over-ear |
| Weight | 260 g | 230 g |
| Battery | ||
| Battery life | N/A (wired) | Up to 40 hours (ANC on) |
| Charging | N/A | USB-C, 3 min = 3 hours, charge while listening |
| Drivers | 42mm dynamic transducer, 300 ohm impedance | 30mm carbon fiber composite |
| Features | Open-back audiophile design, 300-ohm impedance for dedicated amp/DAC use, Balanced 4.4mm Pentaconn cable included, Replaceable ear pads and cables, Handmade in Germany | QN3 HD processor (7x faster than QN1), 12 microphones for ANC, Foldable design, 360 Reality Audio, DSEE Extreme upscaling, Cinema upmix mode, Speak-to-chat |
| Connectivity | ||
| Wired option | ||
| Codecs | SBC, AAC, LDAC, LC3 | |
| Bluetooth | None (wired only) | 5.4 |
| Multipoint | ||
| Water Resistance | None | — |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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