Dekoni Earpads for Fostex TH-900 / TH-X00 / TH-600 / TH-500RP Series
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The Fostex TH-900, TH-X00 (the Drop collaboration), TH-600, and TH-500RP share a large, round ear cup with a biodynamic driver tuning that prioritises bass extension and warmth. The TH-900 with its Urushi lacquer cups is something of a collector's item; the TH-X00 brought the platform to a wider audience at a lower price. Denon's AH-D5000, AH-D7000, and related models also use this geometry.
Available materials
Elite Sheepskin: Real sheepskin, solid face. The TH-900 series already leans warm; sheepskin reinforces this. Bass impact increases, high-frequency extension softens slightly. For listeners who want to lean into the Fostex sound signature rather than neutralise it, this is the compatible choice.
Elite Fenestrated Sheepskin: Perforated sheepskin. Reduces the full-seal effect, keeping more treble extension and soundstage width than solid sheepskin allows. A technically interesting option for a headphone where both the bass warmth and the high-end extension contribute to its character.
Elite Hybrid: Velour face, leather surrounds. Pulls the TH-900 series back toward neutral: velour reduces the bass emphasis, leather surrounds maintain durability and thermal comfort. For listeners who find the stock Fostex sound too dark or bass-heavy, the hybrid moves the presentation in a more neutral direction.
Drop-in fit for TH-900, TH-X00, TH-600, TH-500RP and compatible Denon AH models. 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: | 102 mm |
| C: | 58 mm |
| D: | 58 mm |
| E: | 23 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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