Rear (Back) Panel Connections; Important Note On Connections - Pro Intercom BP1SL Operating Instructions

Now you can use head sets with electret
mi cro phones!
Rear (Back) Panel Con nec tions
Circuit B
If you don't read any thing else, please read this!!!
By con ven tion, in or der to avoid any con fu sion with low im ped ance mi -
cro phone jacks, the fe male jack on in ter com equip ment is con sid ered
the in put, while the male jack is in tended to be used to loop on wards to
other sta tions in the sys tem. Re vers ing this or der will not ef fect per for -
mance, but does make it more prob a ble that a re ver sal of pins 2 and 3
will oc cur. This is the sin gle most com mon cause of fail ure in both
beltpacks and in com plete in ter com sys tems.
24VDC to the com mu ni ca tions con duc tor which will, at a min i mum,
cause the sig nal light sys tem to be come er ratic and even tu ally fail,
caus ing in ter nal dam age to the beltpack(s).
4-pin Male XLR
Mic. Gnd.
Mic. +
Head set
Ear +
Ear 0
Circuit A
The re ver sal will ap ply