Desktop Digital Amplifier PA3s is a high-performance desktop digital amplifier that supports RCA unbalanced and TRS balanced inputs.Maximum output power up to 80W x 2 (40), and a little body contains a huge amount of energy!PA3s could output 80W x2 at 4ohm load,10%THD+N. In higher standard of THD+N of 1%, output power will be 65Wx2 at 4ohm load. The output power is enough to drive any bookshelf speakers and even some floor speakers.We hope it could bring you more fun at enjoying music. Contents list PA3s x 1AC to DC power adapter x1 AC cable x 1User manual x 1Warranty card x 1 Measured: 16.8cm x 12.0cm x 4.0cm Weight: 740g Color: Black/Silver TOPPING PA3s - Class D Power Amplifier High output power 80W x 2 @4Ω, 10%THD+N65W x 2 @4Ω, 1%THD+NBalanced AmplifierMA12070 x 2 Merus Class DTHD+N <0.004% RCA+TRS Input Power input: DC26V/5.76A @DC base 5.5*2.1 Signal inputs: SE, BAL Signal output: Speaker terminal (BTL output) 2 x MA12070 Class D Amplifier Each channel of PA3s uses one MA12070 Class D power amplifier chip. This allows separation in layout, improving performance and reducing crosstalk. The power is shared across two chips, the heat dissipation is also halved for each chip, improving reliability and extending the lifespan of the product. “Comfort zone” with Lowest Distortion The lowest THD+N of PA3s is in the range of 10-20W output, which happens to be the power range commonly used for listening to music.Everything is just in the right condition. Balanced Single-ended Inputs PA3s provides TRS balanced input and RCA single-ended input. The use of balanced input eliminates potential ground loop problems giving the pristinely clean audio without any hum. Two inputs are selectable using the front panel button. PA3s will remember the input selected when it was turned off. High Output Power PA3s could output 80W x 2 at 4ohm load, 10%THD+N. In higher standard of THD+N of 1%, output power will be 65W x 2 at 4ohm load. The output power is enough to drive any bookshelf speakers and even some floor speakers. Use with D10 Balanced D10 Balanced can provide high-fidelity USB decoding and TRS balanced output. When used with PA3s, it is equivalent to adding a high performance USB input to PA3s. This combination is simple and efficient. Use with DAC PA3s can be used with a DAC to expand the categories of digital inputs; if used with a DAC + HPA, more comprehensive functions can be achieved.PA3s is the best power amplifier for DX3Pro+