motor18: If your using TSU2000s it shouldn't be a problem. I believe the original prontos couldn't deal with 455khz IR...

I ended up exchanging email with xantech tech support about the MS455... It actually takes 40khz and makes it back into 455khz. They make special IR recievers that accept 455 from a remote, and output 40. They do this so you can distribute it using normal IR disto gear.

Thanks for all the links to xantech dealers!

--Donald