Credit-card amps: Miniaturization could change the look and feel of many audio products. On October 29, Austin, TX–based D2Audio
announced its new line of MXS amplifiers, each only 1.5" tall with a footprint no bigger than a credit card. Intended for use with in-wall or on-wall loudspeakers, MXS amps can deliver up to 125Wpc into 8-ohm speakers or up to 250Wpc into 4-ohm speakers, with THD+N of <0.1% at full-rated power from 20Hz to 20kHz. Dynamic range is specified at "up to 145dB." The tiny digital amplifiers have programmable DSP features and 93% power efficiency, thereby eliminating the need for large heatsinks, and are said to sound as good or better than many traditional designs. Two-channel modules can also be used for bi-amping, according to the manufacturer.