PRO4AAT vs UR21v Ear Cushion: Which Replacement Fits
By Koss Stereophones | Published: 2026-10-23
Category: Comparisons
Compare the PRO4AAT and UR21v ear cushions from Koss Stereophones. Learn which replacement set fits your headphones and the trade-offs between them.
Quick answer
Choose the PRO4AAT Ear Cushion if your Koss headphones need both new cushions and a fresh screen and foam assembly. Choose the UR21v Ear Cushion if you only need a simple pair of replacement ear cushions without additional components.
What each replacement includes
The PRO4AAT Ear Cushion set comes with two ear cushions plus a screen and foam assembly. This makes it a more complete refresh for compatible Koss stereophones that use those internal parts.
The UR21v Ear Cushion includes one pair of ear cushions only. It is a straightforward swap for headphones that do not require a screen or foam replacement.
Compatibility considerations
Both products are listed as accessories for Koss stereophones, but their internal designs differ. The PRO4AAT is built for models that accept a screen and foam assembly, while the UR21v is a simpler cushion-only design.
If you are unsure which your headphones need, check the original cushion assembly. If it includes a separate screen and foam layer, the PRO4AAT is the intended match. If it is just a cushion, the UR21v is the simpler choice.
Trade-offs between PRO4AAT and UR21v
- Included components: PRO4AAT includes two ear cushions plus a screen and foam assembly. UR21v includes one pair of ear cushions only. Choose PRO4AAT for a fuller refresh; choose UR21v for a simple cushion swap.
- Price difference: PRO4AAT is priced at USD 3.20 (catalog comparison USD 5.00). UR21v is USD 3.60 (catalog comparison USD 5.00). PRO4AAT costs slightly less and includes more parts.
- Fit specificity: PRO4AAT is designed for headphones that use a screen and foam assembly. UR21v fits models that accept cushion-only replacements. Verify your headphone's internal design before choosing.
Product facts at a glance
- PRO4AAT Ear Cushion: Each set includes two ear cushions along with a screen and foam assembly. You get everything needed to refresh both the cushion and the internal screen and foam in one package.
PRO4AAT Ear Cushion - UR21v Ear Cushion: This item includes one pair of ear cushions only. It is a direct cushion replacement without extra parts, ideal for a simple swap.
UR21v Ear Cushion
Which should you choose?
Best for
- Owners of Koss stereophones that use a screen and foam assembly who want a complete refresh
- Budget-conscious buyers who want more components for a lower price
Not for
- Headphones that only need a cushion swap without internal screen or foam parts
- Users who prefer the simplest possible replacement without extra components
