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Clocking a MOTU audio interface to an Apogee Big Ben, but termination LED doesn’t light.

This is a known issue with MOTU interfaces and the Apogee Big Ben, and the good news is, you don’t need to do anything. Here’s Apogee’s word on the topic:

“When a MOTU interface is connected without termination, Big Ben’s Termination LEDs light correctly when the MOTU interface is powered off, but indicate under-termination when the interface is powered on. When a MOTU input is terminated with a 75-ohm load, Big Ben’s red (over-terminated) LED lights. Thus, do not terminate MOTU inputs, as this does not affect clock performance.”

The Apogee website has an informative document on Big Ben and termination.

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