Sennheiser HD 660S2 Review

How we review

Catalog-based review: we compile public specifications, cited buyer sentiment, and editorial analysis. This article does not represent in-house lab testing.

Hands-on testing
Public specifications
User review summary
AI-generated advice

Side-by-side compare and AI summaries are labeled separately in the compare workspace.

Our verdict

listeners who want audiophile open-back without paying for active noise cancellation

The Sennheiser HD 660S2 is positioned for audiophile open-back.

What we like

Battery life: Wired
Weight: 260 g
Connections: 6.35 mm / 4.4 mm balanced
Design / portability: Not foldable
Release year: 2023

Keep in mind

No active noise cancellation listed in the verified specification set for this model.
No bluetooth listed in the verified specification set for this model.
No multipoint pairing listed in the verified specification set for this model.

Who should buy

listeners who want audiophile open-back without paying for active noise cancellation

Who should skip

you need strong active noise cancellation for travel or open offices

Key specifications

anc

battery life

Wired

weight

260 g

bluetooth

multipoint

audio connections

6.35 mm / 4.4 mm balanced

microphone quality

No built-in microphone

foldability

Not foldable

release year

2023

How we researched this

This review summarizes publicly documented information for the Sennheiser HD 660S2. Catalog positioning: Audiophile open-back. Amazon US detail page verified 2026-09-22; exact model and variant matched to ASIN B0BT7XXYTB. Positioning: Audiophile open-back. Documented specifications for this model include Battery life: Wired; Weight: 260 g; Connections: 6.35 mm / 4.4 mm balanced; Design / portability: Not foldable; Release year: 2023. Based on the specification set above, this model is best considered for listeners who want audiophile open-back without paying for active noise cancellation It is a weaker match if you need strong active noise cancellation for travel or open offices This article does not include hands-on testing. Ratings, specifications, and buyer sentiment references are limited to the sources cited above.