Does the Apple Thunderbolt to FireWire adapter work with Duet FireWire & Ensemble Firewire?

Yes! The Apple Thunderbolt to FireWire adapter works with Duet FireWire and Ensemble FireWire.

https://www.apple.com/shop/product/MD464LL/A/apple-thunderbolt-to-firewire-adapter

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There is no difference in quality or performance from using a built in FireWire port.