That 300 ohm impedence frightens me. i have ak sr25 mk2 music player i assume ok but i want to listen to movies from hifi amplifier, are both ok?

I’m not sure ….. I listen through a modestly-priced iFi dac & headphone amp and they don’t struggle at all for power 👍🙂

Fast charging ? As per spec.

These headphones don't have batteries, so there's no fast charging (or any other kind of charging).

Deliver to Finland

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SennheiserHD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black

SennheiserHD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black

Product ID: 509545979

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Details

Brand
Sennheiser
Colour
Black
Ear placement
Over Ear
Form factor
Over Ear
Impedance
300 Ohm
Noise control
None

🎧300Ω ultra-light aluminum voice coil

🔊Double sound pressure at sub-bass octaves

🌬️Airflow-optimized 42mm transducers

Description

🎶 Elevate your audio game—hear what others miss.

FEEL EVERY BEAT - Double the sound pressure at the lowest octaves means you don’t just hear the bass—you feel it.
STUDIO GRADE SOUND PRECISION - Experience crystal-clear, natural high-fidelity audio with deep sub bass that puts you in the recording booth.
CUTTING EDGE VENTILATION TECH - Optimized airflow and vented magnet system minimize distortion for pure, immersive sound.
BREATHE EASY WITH OPEN BACK DESIGN - Enjoy exceptional comfort and breathability for marathon listening sessions without fatigue.
GERMAN ENGINEERING MEETS IRISH CRAFTSMANSHIP - Premium build quality with detachable cables and a wide 8 Hz - 41,500 Hz frequency range for versatile professional use.

The Sennheiser HD 660S2 wired headphones deliver studio-quality sound with a 300-ohm ultra-light aluminum voice coil and airflow-optimized 42mm transducers. Featuring a vented magnet system and double sound pressure at sub-bass frequencies, these open-back headphones offer exceptional comfort and precise audio reproduction across an expansive 8 Hz to 41,500 Hz frequency range. Designed in Germany and crafted in Ireland, they come with detachable cables and premium materials for professional-grade listening and recording.

Specifications

Connectivity technology	Wired
Wireless communication technology	Kopfhörer mit Kabel
Included components	4.4 mm cable (1.8 m), 6.3 mm cable (1.8 m), 6.3mm to 3.5mm adapter, HD 660S2 headphones, Protective Case, Quick Guide, Safety Guide
Age range (description)	Adult
Material	Aluminium
Specific uses for product	Registration
Recommended uses for product	Recording
Compatible devices	Devices with 6.35 mm audio input or adapter compatibility
Cable feature	Detachable
Item weight	260 Grams
Frequency range	8 Hz - 41,500 Hz
Package type	FFP
Style	HD 660S2
Control method	Touch
Number of items	1
Product Dimensions	24.2 x 18.2 x 10 cm; 260 g
Item model number	700240
Connector	3.5mm Jack
Material Type	Aluminium
Size	one size
Item Weight	260 g

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