This is an Apos Certified product. That means it's refurbished, like new, eligible for our 45-day return policy, carries an Apos Certified One-Year Warranty, and ships from our US facility. Currently, Apos Certified products are only available to customers with a US shipping address. We appreciate your understanding as we aspire to expand our offerings to a broader audience in the future.

Fully balanced, super efficient 

The TOPPING PA3s is a fully balanced Class D power amplifier--an affordable and efficient option for powering your bookshelf or floor stand speakers. As a balanced amplifier, it powers each incoming channel with a separate amplifier chip. As a Class D amp, it uses far less power than Class A amps, making it super efficient.

Fully balanced Class D amplification

In the PA3s, each channel is separately amplified by its own Class D power amplifier chip. By separating the channels, the PA3s achieves greatly reduced crosstalk and better audio performance. Each chip has its own heat dissipation, which extends the lifespan of the amp.

80W x2 of power

Drive any bookshelf or floor stand speakers with 80Wx2 of power at 4Ω load.

Balanced + single-ended inputs

Connect multiple sources via TRS balanced and single-ended RCA inputs. The balanced input option eliminates potential ground loop problems, providing pristine audio without hum. Either input is selectable using the front panel button, and the PA3s will remember the last input selected when you turn it on.

Product highlights

• 80W x2 @4Ω, THD+N <10%
• 65W x2 @4Ω, THD+N <1%
• Two MA12070 Class D power amplifier chips 
• Fully balanced amplifier
• <0.004% THD+N
• RCA and TRS inputs

Specs

• Single-ended input
• THD+N @1kHz (A-wt)
• <0.005% @4Ω 5W
• <0.004% @8Ω 5W
• THD @20-10kHz (20kBW)
• <0.008% @4Ω 5W
• <0.007% @8Ω 5W
• SNR: 107dB
• DNR: 107dB
• Frequency response: 20Hz-40kHz (±0.1dB)
• Output level
• 46Vpp@4Ω
• 48Vpp@8Ω
• Noise (A-wt): <70uVrms
• Channel crosstalk @1kHz: -96dB
• Input sensitivity: 0.92Vrms
• Gain: 25.2dB
• Channel balance: 0.5dB
• Balance input
• THD+N @1kHz (A-wt)
• <0.0045% @4Ω 5W
• <0.004% @8Ω 5W
• THD @20-10kHz (20kBW)
• <0.007% @4Ω 5W
• <0.006% @8Ω 5W
• SNR: 112dB
• DNR: 112dB
• Frequency response: 20Hz-40kHz (±0.1dB)
• Output level
• 46Vpp@4Ω
• 48Vpp@8Ω
• Noise (A-wt): <70uVrms
• Channel crosstalk @1kHz: -100dB
• Input sensitivity: 1.75Vrms
• Gain: 19.5dB
• Channel balance: 0.5dB
• Output power
• 80W x2 @4Ω THD+N <10%
• 45W x2 @8Ω THD+N <10% 
• 65W x2 @4Ω THD+N <1%
• 37W x2 @8Ω THD+N <1% 
• Adapter impedance: 4-8Ω 
• Dimensions: 6.6” x 4.7” x 1.5” (16.8 x 12 x 4 cm)

What’s included

• PA3s
• AC to DC power adapter
• AC cable
• User manual
• Warranty card

What pairs well

• TOPPING D10 Balanced DAC