the Beyer DT770, 880, and 990 have the same drivers. the only thing different with the 770 drivers is that they have a small foam cap on the back of them. So, if you come across any of those for a reasonable price, snag them. You can probably buy a pair of 770s for $130 or so, maybe cheaper in the FS forums. It might be cheaper than getting 2 drivers from the Beyerdynamic website. That would be pretty interesting to do that mod, I wonder if they would sound anything like the 880s or 990s. Those drivers sound great in open headphones.
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