confidence monitoring

hey guys this is going to sound really stupid but for the life of me i cant remember what the device a boom op uses to monitor what sound hes picking up to help him know when hes on axis. i thought it was a wire tap but i couldnt find any that were xlr at b and h.
 
duplex cable?

or wireless monitor?

or use a belt preamp, where he can send line level to the mixer and power the mic from a unit that has a headphone jack.
 
thanks alot yeah its a belt preamp thanks. now i guess the next question is what is a good one to get... it doesnt seem like its somthing that would vary to much
 
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Yeah thats not the right term for it though. I'm not sure what they're officially called, sound devices have one i think, and rolls have one.
 
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