Sennheiser HD 660S2

Sennheiser HD 660S2

$4992023

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	Sennheiser HD 660S2
Active Noise Cancelling
Type	over-ear
Weight	260 g
Battery
Battery life	N/A (wired)
Charging	N/A
Drivers	42mm dynamic transducer, 300 ohm impedance
Features	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
Bluetooth	None (wired only)
Multipoint
Water Resistance	None

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