This rack mount amplifier is specifically designed as a headend amplifier to be used in analog or digital headends after combining of the various signals. The HEA-40D31 features a single output on the rear which incorporates both the forward path output and the reverse path input. The HEA-40 then features an internal diplex filter which provides a separate for- ward input connector and reverse output connector. The headend amplifier features midstage gain and slope controls as well as plug in pads and equalizers on the forward path. The reverse path has a separate gain control along with an input plug in attenuator (pad). The rackmount amplifier also has a passive/active reverse feature which is user selected using a front panel switch.