“HD 598” can refer to more than one Sennheiser design. The classic HD 598 is an open-back wired headphone; HD 598 Cs is a closed-back variant built for more isolation. That acoustic difference matters more than cosmetic color changes.
Quick answer: Use the classic HD 598 for quiet-room open-back listening. Use HD 598 Cs when you need a closed earcup and more isolation. If buying new rather than used, compare the still-supported HD 599 family as the more current open-back reference.
| Model | Acoustic design | Practical implication |
|---|---|---|
| HD 598 | Open, dynamic | Sound leakage; little isolation; 50 Ω |
| HD 598 Cs | Closed, dynamic | More isolation and less leakage than the open model |
| HD 599 | Open, dynamic | Current HD 5-series open-back reference with active support documentation |
Classic HD 598 Is an Open-Back Model
Sennheiser's archived technical data lists the HD 598 at 50 Ω, 12 Hz–38,500 Hz and 294 g, with a detachable 3 m cable. Open cups mean it is not designed to block surrounding noise.
HD 598 Cs Is a Different Acoustic Design
Sennheiser's current product archive identifies HD 598 Cs as closed-back and emphasizes isolation. Do not apply reviews or sound-leakage comments from the open HD 598 directly to the Cs.
HD 599 Is the More Current Open-Back Comparison
The HD 599 remains in Sennheiser's active support system with current specifications. It shares the 50-ohm/open-back home-listening concept but should be treated as its own model rather than a renamed HD 598.
See the HD 599 guide for the current open-back model.
HD 598 Series FAQ
Is HD 598 Cs the same as HD 598?
No. The classic HD 598 is open-back, while HD 598 Cs is closed-back. That changes isolation, leakage and the intended environment.
Is HD 599 just a color update?
No. Treat HD 599 as a separate later model with its own specifications and support documentation.
