Q: What is the purpose of the NA4FC-F and NA4FC-M speakON-to-XLR adapters?
A: Neutrik's NA4FC-F and NA4FC-M are generally used to interface speaker-level, high-amperage XLR connections with speakON. Only the 1+ and 1- connections on the speakON connector are active (wired). These parts are very rarely used, since speaker-level connections are rarely made via XLR connectors. These parts should only be used by experienced technicians who understand the amperages involved. Never use these products to connect an amplifier output to any line-level type input! Doing so will almost surely blow something up. These parts are not attenuators, just passive adapters.