# SENNHEISER HD 660 S2

**Brand:** SENNHEISER
**Category:** Audio & casques
**Code (GTIN/SKU):** 4260752330374
**Canonical URL:** https://openreviews.io/en/reviews/sennheiser/sennheiser-hd-660-s2-4260752330374

## Rating: 4.8/5 ★★★★★ — 6 reviews analyzed
_Confidence: high_

## At a glance

SENNHEISER HD 660 S2 reviews: 4.8/5 based on 6 analyzed reviews, updated November 2, 2026.

Praised: precise mids and sound dynamics.

6 reviews analyzed, all published on other sites.
Other sites: 1 source, 6 reviews, average rating 4.8/5.
How we count reviews: https://openreviews.io/en/methodology

## AI summary

The SENNHEISER HD 660 S2 is an over-ear headphone designed for audiophiles seeking great sound precision. Users highlight the particularly faithful and detailed reproduction of mid frequencies, which brings beautiful clarity to vocals and instruments. Additionally, the impulse response has been optimized to offer a more dynamic and responsive sound. This model also corrects the weaknesses of previous versions by offering more present and better-controlled bass, thus meeting the expectations of lovers of balanced sound.

## Strengths

- **Precise mids** — The reproduction of mid frequencies is extremely detailed, offering remarkable clarity on vocals.
- **Sound dynamics** — The improvement in impulse response brings excellent responsiveness and more dynamism to the listening experience.
- **Improved bass** — The bass has been reworked compared to previous models to offer a more balanced presence.

## Frequently asked questions

- What is the difference in bass compared to the HD 660S?
- Does the headphone require a dedicated amplifier?
- How is the vocal rendering on this model?
- Is the sound dynamics suitable for all music styles?

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_Source: OpenReviews — https://openreviews.io/en/reviews/sennheiser/sennheiser-hd-660-s2-4260752330374_