Here is a blurb on the amp at Audio Advisor.
Sure, Parasound's compact Zamp is cute. But is it a serious amplifer? Oh, yeah. The Zamp incorporates a lot of the same technology that has made Parasound's full-scale amps a favorite with the audiophile press. That means it's got a torroidal transformer, discrete components, JFET inputs, bipolar outputs, and high quality parts throughout.
Independent power supplies for each channel keep audio clean and ready to rock with needed current reserves. The fully discrete direct coupled design with DC servo control boasts a 200 VA torroidal power transformer with 8,800 uF power supply filter capacitance.
Zamp's big sound in a small box will easily fill a bedroom or office, and also provides the cornerstone for a 'separates' home theater system. The auto turn on feature is especially helpful in theater set-ups. Using the DC trigger input and a preamp with a DC trigger output - such as Parasound's matching Zpre the Zamp powers on when you power up your preamp. This great feature saves a lot of time and effort when dealing with a complex theater system with several individual components.
The Zamp has mucho flexibility in the power delivery department. It outputs a respectable 30 watts-per-channel into 8 ohms and 45 watts-per-channel into 4 ohms. Flipping a rear-panel switch puts the Parasound in bridged mono mode for 75-watt output at 8 ohms. Front panel LED indicators keep track of functions, while a convenient headphone connection let you enjoy music or movies in private.