Dekoni Earpads for Sennheiser HD 598 / 599 / PC37X Series
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The HD 598, HD 599, and Massdrop PC37X share the same ear cup geometry: open-back, circumaural, 50 ohm, and accessible enough to drive from a phone or a laptop while remaining genuinely good headphones to work or listen with. For many people they are a first serious open-back. The velour-over-foam stock pads are comfortable but wear down and eventually go flat.
Available materials
Choice Memory Foam: Dekoni's JRZ line. Memory foam fill under a velour-style face. The most neutral material choice for this platform: preserves the open, airy character of the HD 598/599 while replacing worn foam with something that holds its shape and distributes pressure more evenly. The right pick if you want the headphone to sound like itself for longer.
Choice Leather: Protein leather outer, memory foam fill. Seals more than velour does, which adds a small amount of bass body and removes a little air from the top end. Warmer on the ears and slightly warmer in the sound. If the stock presentation felt a touch thin or bright, this material edges it in the other direction.
Both are drop-in fit. Genuine Dekoni pads, stocked and sold by Arachne Audio in Tallinn.
How these pads change the sound
Measured deviation from the stock earpads, per material. Dekoni's own lab data.
Ear pad dimensions
| A: | 113 mm |
| B: | 89 mm |
| C: | 72 mm |
| D: | 47 mm |
| E: | 22 mm |
Verified to fit
Model not listed? Ask us and we'll confirm the fit.
SUPPORT
Questions, answered.
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Worldwide. Every order includes tracking. You'll get the details via email as soon as it ships.
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Baltics & Nordics: 1–3 days. Rest of Europe: 4–6 days. International: 8–14 days. These are estimates, most orders arrive faster.
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Not happy? Return unused items within 14 days for a full refund. Custom orders are final sale since they're made specifically for you, but we'll make it right if anything's wrong.
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Find your headphone model, pick your options (color, length, connectors), and add to cart. The visual slider on each product page shows exactly what you're getting.
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Our Inspiration page is packed with recent builds. Got something specific in mind? Reach out—we'll mock it up for you before you commit.
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Most cables ship within 5-10 days, but we will keep the production queue updated on the checkout page.
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It's important to note that splitters are purely decorative and do not have any impact on the audio quality or durability of the cables we offer.
As such, your decision to include a splitter in your setup should be based solely on your aesthetic preferences and not on any functional benefits.
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Yes, if there is some special color, or anything else you can't find on our store, contact us. We will see what we can do for you.
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All major cards (Visa, Mastercard, Amex, Discover), PayPal, and Klarna if you want to split it up. Whatever works for you.
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Two years. If it's a materials or workmanship issue under normal use, we'll repair or replace it free. We stand behind what we make.
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