Audio out on Mac Pro (late 13) with JBL Creature

Just set up new Mac Pro and plugged JBL Creatures I have used with audio line out in several Macs into the line out jack - no sound. Sytem prefs Sound output set to Line Out (highlighted). Nothing. Reconnected, then reversed and reconnected Creature input cable (green rung, 3 connector). Nothing.Internal speaker works fine. Is there an easy way to test whether the Line Out jack is delivering a signal; would there by anything about the Creature that would be incompatible (am I giving a digital output to an analog device?
thnx in advance

yes, Digital to analog.

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