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shuttle 6.0 help plzz

So I've searched and searched to no avail, so i figured I'd start my own thread on the topic,

I have a shuttle 6.0 and am usually running out of a 410 cab, I've been told that running a head with no cab will damage the head but my question is is this still true if I'm using the balanced line out? like can i run the balanced line out to my friends boss recording station with no cab attached?

Also when I'm using the headphone out jack do I need to have a cab connected?
 
Ok and on the headphone amp note, do I need to get headphones with a quarter inch jack? Because I've been running ear buds through a quarter inch adapter and I'm not getting any sound. Am I missing something?