Two power amplifiers are illustrated: the My Ref. revision A, by Mauro Penasa, and the Hypex UcD180. The first is an uncommon use of the National power IC LM3886, and is capable to supply 50W@8 ohm with ease, while the latter is an innovative class D amplifier, with more than 100W under the hood. The two parts article was published on audioXpress, and includes a listening comparison between the two contenders.