Is this model better or 660?

You have to understand that the Sony Z7M2 are 56 ohms so they are easy to drive. Now on the other hand the 660s are 150 ohms and need a little more power to drive them. Now the 660s2 are 300 ohms which need more power. I have the 660s and have no problems with them. I want to get the 660s2 but don't want to take a chance on buying them and I can't drive them with my setup. Hope this help you out. Have a great day.

Would these be great when used with a Steam Deck?

Thanks for your question. The HD 660S2 will go very well with Steam Deck. World Wide Stereo – since 1979 – and a proud authorized Sennheiser dealer.

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Sennheiser Consumer Audio HD 660S2 - Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black

Sennheiser Consumer Audio HD 660S2 - Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black

Product ID: 507909782

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Details

Brand
Sennheiser
Color
Black
Ear Placement
Over Ear
Form Factor
Over Ear
Impedance
300 Ohm

🎧42mm airflow-optimized transducers

🎼8 Hz - 41.5 kHz frequency range

🔊300Ω ultra-light aluminum voice coil

Description

🎶 Elevate your audio game—hear what others miss!

POWERFUL LOW END IMPACT - Feel the double sound pressure on the lowest octaves—bass that hits like you’re in the studio.
STUDIO GRADE SOUND PRECISION - Experience ultra-clear, natural audio with deep sub bass that brings every note to life.
BREATHE EASY OPEN BACK DESIGN - Enjoy long listening sessions with breathable ear cushions and superior ventilation.
GERMAN ENGINEERING IRISH CRAFTSMANSHIP - Premium build quality ensures durability and exceptional sound fidelity.
DETACHABLE CABLES FOR ULTIMATE FLEXIBILITY - Switch between devices effortlessly with long, detachable cables designed for desktop and mobile use.

The Sennheiser HD 660S2 wired headphones deliver high-fidelity sound with a 42mm airflow-optimized dynamic driver and a 300-ohm ultra-light aluminum voice coil, offering a wide frequency response from 8 Hz to 41.5 kHz. Designed with an open-back, vented magnet system for minimal distortion and maximum comfort, these headphones provide studio-quality audio with deep sub bass and detachable cables for versatile use.

Specifications

Control Method	Touch
Control Type	Media Control
Unit Count	1.0 Count
Item Weight	630 Grams
Water Resistance Level	Not Water Resistant
Is Electric	No
Antenna Location	music
Compatible Devices	Smartphone
Cable Features	Detachable
Additional Features	stereo pairing
Enclosure Material	Aluminum
Specific Uses For Product	Music
Headphone Folding Features	Over Ear
Earpiece Shape	Oval
Headphones Ear Placement	Over Ear
Style Name	Headphones
Theme	Music
Color	Black
Connectivity Technology	Wired
Headphone Jack	1/4 inch TRS, 4.4 mm TRRRS
Frequency Range	8 Hz - 41.5 kHz
Audio Driver Type	Dynamic Driver
Audio Driver Size	42 Millimeters
Impedance	300 Ohm
Noise Control	Sound Isolation