We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-29 · 6 min read · Independent comparison
If you want a pair of replacement ear pads that can revive several different on-ear headphones you already own, choose Krone Kalpasmos Professional Replacement Ear; if you need a dedicated, memory-foam refresh made specifically for one headset, choose Miruchertter W820NB.
• Krone Kalpasmos — biggest strength: very broad compatibility across JBL, Logitech, Panasonic/Technics and Sony on-ear models, so one set can rescue a whole drawer of tired headphones.
• Krone Kalpasmos — biggest trade-off: it only fits 70mm round on-ear cups, so it is useless on over-ear or oval designs.
• Miruchertter W820NB — biggest strength: high-density memory foam and softer leather aimed squarely at all-day comfort on one specific headset.
• Miruchertter W820NB — biggest trade-off: it fits the Edifier W820NB and nothing else, so it is a single-purpose purchase.
• Buy the Krone Kalpasmos if you own several compatible on-ear headphones and want a universal fix.
• Buy the Miruchertter W820NB if you own the Edifier W820NB and want a purpose-built, comfort-first replacement.
This is a repair part, not a headphone. The whole pitch is that you keep the headset you already like and swap out the part that wears out first. Krone Kalpasmos builds it from PU leather over a sponge core, with fine stitching and an ergonomic lip designed to grip the cup edge instead of sliding off. The color is white, and the material is listed as faux leather.
The compatibility list is the real story here. It covers JBL T450BT and T500BT, the JBL Tune 600BT, Logitech H390 and H530 USB headsets, Panasonic Technics RP-DJ1200 and RP-DJ1210, and a spread of Sony models including the MDR-ZX110, MDR-ZX330BT, WH-CH500, MDR-V150 and DR-BT101. If you have a cheap set of on-ear headphones that still sound fine but feel awful, this is the cheapest way to keep them alive — and it beats throwing away working electronics.
The catch is size. These pads are made for 70mm round cups, which works out to roughly 2.75 inches in diameter. If your headphones are over-ear, oval, or anything outside that footprint, they simply will not seat properly. Krone Kalpasmos even suggests contacting them before ordering if you are unsure, which tells you the fit question is the one that matters.
Who should buy it: anyone with compatible JBL, Logitech, Technics or Sony on-ear models who wants to extend their life instead of replacing them. Who should skip it: over-ear owners, or anyone whose cups are not 70mm round.
Miruchertter W820NB: Who It's For
This one does a single job and does not pretend otherwise. The Miruchertter W820NB replacement pads are built for the Edifier W820NB headset — that is the compatibility list, start to finish. If that is your headphone, the fit is designed for it rather than approximated. If it is not, this product has nothing for you.
The material spec is where it earns attention: high-density memory foam wrapped in softer protein leather. Memory foam is the key difference from a plain sponge core, because it compresses to the shape of your ear and head rather than pushing back uniformly. Miruchertter frames the benefit as comfort you can wear all day and, in their words, forget you are wearing. That is marketing language, but the underlying logic holds — memory foam generally distributes pressure better over long sessions than basic foam.
The second claim worth noting is sound isolation. The foam cushion is described as blocking outside sound and retaining the original character of the W820NB. That is the correct goal for a replacement pad: you are not trying to change the tuning, you are trying to restore the seal the original pads had before they flattened out. A worn, compressed pad leaks bass and lets noise in, so a fresh memory-foam set can genuinely bring a headset back toward how it sounded when new.
The package is one pair of earpads and nothing else — no headphone, no tools. Miruchertter also states a one-year warranty period on the product, with a two-year manufacturer warranty noted. Color is listed as black, with leather and memory foam as the enclosure materials.
Who should buy it: Edifier W820NB owners whose pads are worn, torn or flattened. Who should skip it: everyone else, including owners of any other headphone brand.
• Best for multiple headphones → Krone Kalpasmos Professional Replacement Ear. One purchase can cover JBL, Logitech, Technics and several Sony models.
• Best for one specific headset → Miruchertter W820NB. Purpose-built for the Edifier W820NB, so fit is not a gamble.
• Best for all-day comfort material → Miruchertter W820NB. High-density memory foam is the more comfort-oriented core of the two.
• Best for reviving budget on-ear sets → Krone Kalpasmos Professional Replacement Ear. It is aimed at exactly that kind of repair.
• Best if you are unsure of your cup size → check first. Krone Kalpasmos needs 70mm round cups; Miruchertter needs the Edifier W820NB.
• Best for a hygiene refresh routine → Krone Kalpasmos Professional Replacement Ear. The brand recommends swapping pads every seven to eight months.
• Best for a straightforward single-model repair → Miruchertter W820NB. No compatibility guesswork, one headset, one pair of pads.
In my opinion, the right pick depends entirely on what is sitting on your desk.
If you own the Edifier W820NB, I would buy the Miruchertter W820NB. It is made for that headset, and memory foam is the better material for long listening sessions — that matters more than versatility when you only have one pair to fix.
If you own any of the JBL, Logitech, Technics or Sony on-ear models on the Krone Kalpasmos list, I would buy the Krone Kalpasmos Professional Replacement Ear instead. It is the smarter buy for anyone maintaining more than one headset, and it keeps working electronics out of the bin. Just measure your cups first — 70mm round is the whole ballgame.
FAQ
No. The compatibility list names the W820NB only, and the pads are shaped for that headset. Buying them for a different model is a fit risk with no upside.
Based on materials, the Miruchertter W820NB uses high-density memory foam, which is generally the more pressure-distributing option. The Krone Kalpasmos uses PU leather over sponge, which is softer and simpler but less conforming over many hours.
Neither product is designed to alter tuning. Both aim to preserve the original sound, and a fresh, properly sealing pad can restore bass and isolation that a worn, flattened pad had lost. If price matters to you, check the current price on Amazon before deciding.
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