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Anybody have any experience with this? Got a new MacBook Pro and of course there is no Firewire 400. Is this even possible with some cables?

No.

You can get a Thunderbolt to FireWire adapter. You need the Apple TB-FW adapter and an 800-400 cable or adapter. Many Ultralite owners are doing this successfully. Oh, bus power is no longer possible since TB only passes 7V -- you need to power externally if you don't do so already.

IIRC, only the original 8pre is incompatible as it requires functionality not supported by the TB spec.

Great, thanks! Just wanted to make sure it would work.

I have a mid MacbookPro with retina and use the thunderbolt to firewire and it works.. but you need a 400 to 800 cable into the firewire to thunderbolt (apple) adapter. I recommend Belkin. Although for some reason since the 10.10.3 Yosemite update it has not been detecting the interface at all and my sound options completely crash / my system starts to get really slow -- I have no idea why. I produced a track after the update with no issues and now all of a sudden its completely unstable. However - I'm making another post for that issue!

Awesome

Well, the adapter and a belkin cable are due to arrive tomorrow, so I guess I'll see how things go.

jackroland wrote:I have a mid MacbookPro with retina and use the thunderbolt to firewire and it works.. but you need a 400 to 800 cable into the firewire to thunderbolt (apple) adapter. I recommend Belkin. Although for some reason since the 10.10.3 Yosemite update it has not been detecting the interface at all and my sound options completely crash / my system starts to get really slow -- I have no idea why. I produced a track after the update with no issues and now all of a sudden its completely unstable. However - I'm making another post for that issue!

Have you filed a support ticket with MOTU?