Audio Alchemy DPA-1 Stereo power amp


From the website: The core of the DPA-1 is a wizardly circuit topology that combines the musicality of traditional Class A and Class AB amps with the power, dynamics and efficiency of the latest Class D designs. From a chassis just 10.5 inches wide, the DPA-1 delivers 125 watts per channel into 8 ohms and 200 watts per channel into 4 ohms.

Pure Class A Input Stage
The input stage mirrors those found in many of the world’s best and most expensive amplifiers: a Class A topology composed of discrete FETs and powered by a semi-toroidal transformer.

The cool-running efficiency of the Class D output stage allows the DPA-1 to deliver maximum performance even in areas with minimal ventilation, such as equipment cabinets and closets. The DPA-1 runs at about 80% efficiency, compared to about 30% for a typical Class AB amp. Power consumption at idle is about 20 watts, compared to 100 watts or more for a Class AB amp with comparable power and sound quality.
Power output/channel (0.1% THD+N, 1 kHz)
125 watts into 8Ω
200 watts into 4Ω
Frequency response +/-0.25 dB, 20 Hz to 20 kHz
Nominal THD+N (1 watt into 8Ω) 0.05%
Signal-to-noise ratio (1 kHz) 100 dB unweighted
Input impedance
XLR: 17.0 kΩ in low gain mode, 17.6 kΩ high gain
RCA: 10.7 kΩ in low gain mode, 11.6 kΩ high gain
Output impedance 0.022 Ω
Channel separation (1 kHz) -80 dB
Gain 20 or 26 dB switchable
Inputs stereo XLR, stereo RCA, IEC power, 3.5mm trigger
Outputs 5-way binding posts
Dimensions 3.0 x 10.5 x 11.6 in (hwd)
Weight 16 lb