
Sennheiser HD540 Reference, Reference II, Reference Gold EarPad Adapter.
thingiverse
This is a standard 100m ring for high-definition 540 headphones. It won't function properly with the 530 series and the compatibility of the Ovation 560 model is uncertain. You can use any earpads, including HM5 hybrids, which I have successfully used myself. However, I advise against purchasing original HD540 pads due to their fragile foam, which may not last more than three years.
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