HOLLAND AHC-16-860 16-Port Active Head-End Combiner, 550 MHz The AHC-16-860 is a high isolation, 16 channel active head combiner. With its internal CATV hybrid push-pull amplifier, the AHC-16-860 is able to compensate for its insertion loss and drive the cable system as well. The AHC-16-860 features a front panel gain control and a -20 dB test port.