Studio Technologies Model 41 IFB InterfaceStudio Technologies Model 41 IFB Interface The Model 41 is designed to create broadcast standard IFB circuits from line level audio sources. The unit's primary application is to interface analog outputs associated with digital matrix intercom systems with broadcast IFB user devices. The Model 41 provides four independent IFB circuits. Each IFB circuit provides DC power and two analog audio signals to support the connected IFB user devices. The Model