Installing Blackmagic Decklink Duo 2 with Sonnet Echo Express SEIIIe Thunderbolt 3 Edition 

Installing Blackmagic Decklink Duo 2 with Sonnet Echo Express SEIIIe Thunderbolt 3 Edition
Sonnet Echo Express SEIIIe can be used to expand Thunderbolt to more camera inputs and outputs.
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Sonnet Echo Express SEIIIe Thunderbolt 3 Edition (3-Slot PCIe Card Expansion Chassis) - amzn.to/3ynrNkY