Apple AirPods 4 vs Sennheiser HD 660S2
The Verdict
Comparing these reveals fundamentally different use cases rather than direct competition. Apple AirPods 4 deliver wireless convenience with Spatial Audio, adaptive EQ, and seamless Apple ecosystem integration, plus IP54 water resistance for everyday wear. Their 5-hour battery and quick 5-minute charging offer practical flexibility. However, they lack active noise cancellation. Sennheiser HD 660S2 represent serious audiophile territory,handmade German engineering with 42mm dynamic drivers, 300-ohm impedance requiring dedicated amplification, and open-back acoustics for critical listening. These excel in sound staging and detail retrieval but demand wired connectivity and external gear investment. Choose AirPods 4 for portable, casual listening with Apple devices; select HD 660S2 for stationary studio or high-fidelity home listening with proper amplification. They address opposite market segments.
Who Should Buy
Buy the Apple AirPods 4 if…
- →Best open-ear fit comfort — virtually disappears in the ear
- →Personalized Spatial Audio with head tracking
- →USB-C charging case finally replaces Lightning
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
Pros
- Best open-ear fit comfort — virtually disappears in the ear
- Personalized Spatial Audio with head tracking
- USB-C charging case finally replaces Lightning
- Seamless Apple ecosystem integration across all devices
- IP54 dust and water resistance for workouts
Cons
- No active noise cancellation — pay $50 more for ANC model
- Open design leaks sound and lets ambient noise in
- AAC only — no aptX or LDAC for Android users
- 5-hour battery is shorter than most competitors
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 | Sennheiser HD 660S2 |
|---|---|---|
| Active Noise Cancelling | ||
| Type | in-ear | over-ear |
| Weight | 4.3 g (each) | 260 g |
| Battery | ||
| Battery life | 5 hrs (earbuds), 30 hrs total with case | N/A (wired) |
| Charging | USB-C, 5-min charge for 1 hr playback | N/A |
| Drivers | Apple H2 chip, custom driver | 42mm dynamic transducer, 300 ohm impedance |
| Features | Personalized Spatial Audio with dynamic head tracking, Adaptive EQ auto-tunes music to ear shape, USB-C charging case, H2 chip with Voice Isolation for calls, Automatic device switching across Apple devices, Find My integration with precision finding | 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 | None |
Related Comparisons
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.
Explore more in headphones, see all Apple products or all Sennheiser products. View full details for the Apple AirPods 4 or the Sennheiser HD 660S2.