To terminate or not? QA403

Recently got back into the QA403 game and purchased one from Matt. Following what others have been doing, I terminated any unused BNC jacks with 50 ohm terminators. Then someone pointed out to me not to terminate the - outputs if they aren’t being used. I wanted to get some clarity on this subject.

Only terminate inputs, outputs may be damaged if terminated.

Thanks, I’ll update where appropriate.