The limitations of Class AB topologies for xDSL applications are presented. A general discussion of Class G/H/H-like amplifier topologies for xDSL applications follows during which a theoretical power consumption derivation of these systems driving discrete multi-tone (DMT) waveforms is presented. From this discussion, circuit examples of each of the three topologies are presented processing identical signals and delivering identical powers for total power consumption comparisons. Finally, several measurements of the AD8393 (Class H-like) ALP amplifier^TM system are given.