Apple AirPods 4 (with Active Noise Cancellation) vs Sennheiser HD 660S2
The Verdict
Apple AirPods 4 with ANC and Sennheiser HD 660S2 serve fundamentally different audiences and use cases. AirPods 4 deliver active noise cancellation, seamless Apple ecosystem integration, and true wireless convenience with 5-hour battery life (ANC enabled) plus 25 additional hours via case. Their H2 chip enables advanced features like Adaptive Audio and personalized spatial audio, though they use basic AAC/SBC codecs. Conversely, HD 660S2 are premium wired audiophile headphones featuring a handcrafted 42mm dynamic driver with demanding 300-ohm impedance, requiring a dedicated amplifier for optimal performance. They offer superior soundstage and instrument separation for critical listening but demand stationary use and additional equipment investment. Choose AirPods 4 for mobile convenience and everyday listening; select HD 660S2 only if you have a dedicated audio setup and prioritize reference-grade fidelity over portability.
Who Should Buy
Buy the Apple AirPods 4 (with Active Noise Cancellation) if…
- →First open-fit AirPods with active noise cancellation
- →Much more comfortable than Pro for users who dislike silicone tips
- →Smaller, lighter case with USB-C and wireless charging
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
Category Scores
Pros & Cons
Apple AirPods 4 (with Active Noise Cancellation)
Pros
- First open-fit AirPods with active noise cancellation
- Much more comfortable than Pro for users who dislike silicone tips
- Smaller, lighter case with USB-C and wireless charging
- Adaptive Audio, Spatial Audio, and Conversation Awareness
- Cheaper than AirPods Pro 2
Cons
- ANC is weaker than tip-sealed earbuds like AirPods Pro 2
- No swappable ear tips means fit may not suit everyone
- AAC only — no hi-res or lossless codecs
- No Precision Finding (no U1 chip in case)
- No wireless charging on the cheaper non-ANC variant (this model has it)
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
Full Specifications
| Spec | Apple AirPods 4 (with Active Noise Cancellation) | Sennheiser HD 660S2 |
|---|---|---|
| Active Noise Cancelling | ||
| Type | in-ear | over-ear |
| Weight | 4.3 g (per bud) | 260 g |
| Battery | ||
| Battery life | 5 hrs buds (ANC on), up to 30 hrs total with case | N/A (wired) |
| Charging | USB-C, Qi wireless, Apple Watch charger | N/A |
| Drivers | Custom Apple low-distortion driver with high-dynamic-range amplifier | 42mm dynamic transducer, 300 ohm impedance |
| Features | Active Noise Cancellation in an open-fit (non-tip) design, Adaptive Audio and Conversation Awareness, Personalized Spatial Audio with head tracking, H2 chip, Find My (case speaker, no Precision Finding U1), Voice Isolation for calls | 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 |
| Connectivity | ||
| Wired option | ||
| Codecs | AAC, SBC | |
| Bluetooth | 5.3 | None (wired only) |
| Multipoint | ||
| Water Resistance | IP54 (buds and case) | 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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