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Topping PA3s (2021) Desktop HIFI Digital Amplifier with 80W x2 Output Power

- 80W x2 (@4ohm, 10% THD+N)
- 65W x2 (@4ohm, 1% THD+N)
- Balanced Amplifier
- MA12070 x2 Merus Class D Amplifier
- <0.004% THD+N
- RCA + TRS Input

2x MA12070 Fully Balanced 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.

High Output Power
PA3s could output 80W x2 at 4ohm load, 10% THD+N. In higher standard of THD+N of 1%, output power will be 65W x2 at 4ohm load. The output power is enough to drive any bookshelf speakers and even some floor speakers.

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 front panel button. PA3s will remember the input selected when it was turned off.

"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.

D10 Balanced could be best USB DAC for PA3s
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.

SPECIFICATIONS
[PA3s Power Amplifier Specifications]

THD+N @ 1kHz (A-wt)
SE IN: <0.0050% @4ohm 5W, <0.0040% @8ohm 5W
BAL IN: <0.0045% @4ohm 5W, <0.0040% @8ohm 5W

THD @ 20-10kHz (20kBW)
SE IN: <0.0080% @4ohm 5W, <0.0070% @8ohm 5W
BAL IN: <0.0070% @4ohm 5W, <0.0060% @8ohm 5W

SNR @ MAX OUT 1kHz (A-wt)
SE IN: 107dB
BAL IN: 112dB

Dynamic Range @ 1kHz (A-wt)
SE IN: 107dB
BAL IN: 112dB

Frequency Response
SE IN: 20Hz-40kHz (+/- 0.1dB)
BAL IN: 20Hz-40kHz (+/- 0.1dB)

Output Level
SE IN: 46Vpp @ 4ohm, 48Vpp @ 8ohm
BAL IN: 46Vpp @ 4ohm, 48Vpp @ 8ohm

Noise (A-wt)
SE IN: <70uVrms
BAL IN: <70uVrms

Channel Crosstalk @ 1kHz
SE IN: -96dB
BAL IN: -100dB

Input Sensitivity
SE IN: 0.92Vrms
BAL IN: 1.75Vrms

Gain
SE IN: 25.2dB
BAL IN: 19.5dB

Channel Balance
SE IN: 0.5dB
BAL IN: 0.5dB

Output Power (SE & BAL Input)
80W x2 @ 4ohm THD+N <10%
45W x2 @ 8ohm THD+N <10%
65W x2 @ 4ohm THD+N <1%
37W x2 @ 8ohm THD+N <1%

Adapter Impedance (SE & BAL Input)
4 to 8 ohm