Topping PA3s, stereo amplifier

The PA3s is a balanced Class D stereo amplifier from Topping

Features
Fully balanced Class D amplifier.
Two stand-alone MA12070 Merus Power AMP circuits.
Very low distortion values.
Balanced TRS interface support.
Single-ended RCA interface support.
Powerful output, drives speakers easily.
Simple and compact shape.
The perfect partner for Topping D10 Bal DAC.

Here’s the brand new Topping PA3s, a fully balanced Class D power amplifier that brings your HiFi speaker setup to life. Equipped with two standalone MA12070 Class D power amplifier chips, the Topping PA3s provides impressive power to easily control both your shelf and floor speakers. It has a symmetrical architecture that allows users to connect it to Topping’s latest TRS-symmetric DAC devices, such as the D10 Balanced and E50.

Two independent Class D power amplifier chips
Topping has equipped the PA3 with two independent MA12070 Class D power amplifier chips for each channel. It is a powerful chip that provides efficient amplification with low distortion and cross-vibration. An independent chip for each channel reduces the overall load on each chip and effectively improves chip stability and service life.

Impressive power that brings your speakers to life.
To get the most out of our HiFi bookshelf and floor-standing speakers, we need to feed them with very clean power. Topping PA3s can provide up to 80Wx2 @ 4Ω output power with THD + N at 10%. When THD + N is 1%, PA3S produces 65Wx2 @ 4Ω. That’s more than enough to bring life to our HiFi speaker assemblies.

Balanced and one-sided input architecture
Users can input an audio signal to the PA3S with both parallel RCA and balanced TRS connections. Using a balanced input eliminates potential ground loop problems, resulting in a cleaner and noise-free background. Users can easily switch between both input options with the button on the front.

Technical information:
One-way input
THD + N @ 1kHz (A-weighted): <0.0050% @ 4Ω, <0.0040% @ 8Ω.
THD + N @ 20Hz-10kHz (20kBW): <0.0080% @ 4Ω, <0.0070% @ 8Ω.
SNR: 107dB.
Dynamic range: 107dB.
Frequency response: 20Hz-40kHz (± 0.1dB).
Starting level: 46Vpp @ 4Ω, 48Vpp @ 8Ω.
Noise (A-wt): <70uVrms.
Crosstalk: -96dB.
Input sensitivity: 0.92Vrms.
Gain: 25.2dB.
Channel balance: 0.5dB.

Bal-tulo
THD + N @ 1kHz (A-weighted): <0.0045% @ 4Ω, <0.0040% @ 8Ω.
THD + N @ 20Hz-10kHz (20kBW): <0.0070% @ 4Ω, <0.0060% @ 8Ω.
SNR: 112dB.
Dynamic range: 112dB.
Frequency response: 20Hz-40kHz (± 0.1dB).
Starting level: 46Vpp @ 4Ω, 48Vpp @ 8Ω.
Noise (A-wt): <70uVrms.
Crosstalk: -100dB.
Input sensitivity: 1.75 Vrms.
Gain: 19.5dB.
Channel balance: 0.5dB.

Output parameters
Output power (THD + N <10%): 80Wx2 @ 4Ω, 45Wx2 @ 8Ω.
Output power (THD + N <1%): 65Wx2 @ 4Ω, 37Wx2 @ 8Ω.
Adapter impedance: 4-8Ω.