Based on 10 r/BuyItForLife mentions

HD 600 Headphones

$499.95

Sennheiser

Editorial Review of Sennheiser HD 600 Open-Back Professional Headphones** The Sennheiser HD 600 Open-Back Professional Headphones have garnered significant acclaim among audiophiles and professionals alike for their impressive sound quality and comfort. Characterized by an open-back design, these headphones deliver an expansive and natural soundstage, allowing listeners to experience music as the artists and engineers intended. With large motors that produce solid, non-muddy bass and clear mids, the HD 600s offer a well-balanced listening experience. Listeners emphasize the "transparent" sound that faithfully reproduces audio details, enabling users to hear both the beauty and imperfections…

Reddit mentions

  • “Grados are a good suggestion. Headphones will eventually break-down in some way, so a good guarantee is a start. Grado will repair most broken parts for cheap or free. Note that…”
  • “These aren't must haves for anyone else, but they've served me well: - Herman Miller Aeron office chair - IBM Model F keyboard\* - Sennheiser HD600 headphones - Stanley thermos -…”
  • “*wireless* headphones aren't built for life. Get some sennheiser hd600 and you've got yourself a 30 year pair of headphones.”
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Product details
Headphone Cup Type
Over-ear
Body Part Use
Head
Noise Cancellation Type
Noise Control
Connectivity Technology
Wired
Compatible Devices
Hi-fi stereo systems
Ports and Interfaces
3.5 mm Jack
Cable Length
3 m
Connectivity Highlights
Detachable Cable
Earpad Material
Velour
Water Protection
Not Water Resistant
Waterproof
No
Water Resistant
No
Driver Size
42 mm
Frequency Response
12 Hz -- 40,500 Hz (speaker)
Headphone Impedance
300 ohm
Sensitivity
97 dB
Sound Output
Stereo
Audio Highlights
Acoustically transparent
Maximum Input Power
200 mW
Total Harmonic Distortion
Minimized distortion
Earcup Style
Open-back
Earcup Type
Open-back
Performance Highlights
Touch Controls, Noise Control
Driver Technology
Dynamic
Diaphragm Size
38mm
Magnet Material
Neodymium ferrous
Compliant Standards
CL127:KT:2016-12-09, CL109:5:2017-04-01 (wee classification), CL126:NO:2016-12-09
Style
Headphones
Weight
260 g
Dimensions
Cumbersome, Big, Bulky
Foldable
No
Material
Plastic
Monaural
No
Pattern
Monochrome black finish, Cool blue-patterned finish, Marbled pattern (on the headband and ear cups, since been discontinued)
Manufacturing
Production had shifted from Sennheiser's German headquarters to Ireland, then to Romania, and back to Ireland
Recommended Use
Music listening
Highlighted Uses
Long listening sessions
Typical Users
Audiophiles
Included Accessories
Cable
Supported Accessories
Replacement pads, Cable, Replacement earpads