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.

Power, Precision, and Purity

The Topping PA5 II Compact Desktop Amplifier is all about delivering a pure, balanced, and immersive audio experience right on your desktop. Engineered with a fully balanced structure and an innovative Class D amplifier circuit, it aims to transform your listening sessions into an unrivaled sonic journey. Its impressive power output, comprehensive circuit protection, and compatibility with other high-fidelity devices also ensure a smooth, worry-free user experience that adapts to your unique audio needs. 

Fully balanced structure

Delight in the purity of sound with the fully balanced structure of these amplifiers. Engineers have tuned these devices for clear, clean, and deep sound with no audible noise floor. The fully balanced structure effectively eliminates the common issues of hum, noise, and ground loops.

Distortion as low as an excellent DAC

Relish incredibly low distortion. The PA5 II and PA5 II Plus achieve a THD+N as low as 0.0004% under a 4 € load when outputting 5W and 0.0003% under an 8 Ω load. This enhances your music listening experience, making every beat count.

High output power

Whether you're driving small speakers or large, these compact desktop amplifiers have got you covered. The PA5 II Plus delivers up to 140W × 2 for 4-ohm loads at 10% distortion and 125W × 2 at just 1% distortion. Similarly, the PA5 II can output 100W × 2 for a 4-ohm load at 1% distortion.

Comprehensive circuit protection

No more worrying about sudden power outages or short circuits. The PA5 II series provides complete protection for overvoltage, undervoltage, short circuit, overcurrent, and overheating. You can focus on your audio, knowing your gear is safe.

PA5 II vs PA5 II Plus?

While the Topping PA5 II and PA5 II Plus share a significant number of features, there is a critical difference in terms of power output. The PA5 II Plus takes the lead with a maximum output power of up to 140W × 2 for 4-ohm loads at 10% distortion, or 125W × 2 at 1% distortion. This is compared to the PA5 II, which provides a maximum of 100W × 2 under the same conditions. This power difference gives the PA5 II Plus an edge for those seeking a bit more amplification capacity for their audio setups, while the PA5 II may be sufficient for users with less demanding power needs.

Product highlights

• Fully balanced structure
• Distortion as low as an excellent DAC
• High output power
• Comprehensive circuit protection
• More compatible connections

Specs

• 16.6cm x 12.9cm x 4.1cm
• Weight: 680g
• Power input
• PA5 II: DC38V/3.0A
• PA5 II Plus: DC38V/4.0A
• Inputs: RCA, TRS
• Outputs: Speaker terminal 
• Power on/off: Switch/trigger signal
• Volume control: Analog potentiometer
• Display: White LED
• Standby power consumption: <0.5W

PA5 II Audio Specs

Balanced Input

• THD+N: <0.0004% @4Ω 5W,
• @1kHz A-wt: <0.0003% @8Ω 5W
• THD+N: <0.0015% @4Ω 5W,
• @No-wt 20kBW: <0.0006% @8Ω 5W
• SNR @MAX OUT 1kHz A-wt: 124dB
• Dynamic Range @1kHz A-wt: 124dB
• Frequency Response: 20Hz-40kHz(‡0.3dB)
• Output Level: 65Vpp @4Ω, 68Vpp @8Ω
• Noise @A-wt: <15uVrms
• Channel Crosstalk @1kHz: -106dB
• Input sensitivity: 2.6Vrms
• Gain: 19.2dB
• Channel Balance: 0.1 dB
• Output Power
• 100W × 2 @4Ω THD+N<10%
• 100W × 2 @4Ω THD+N<1%
• 85W x 2 @8Ω THD+N<10%
• 65W × 2 @8Ω THD+N<1%
• Adapter Impedance: 4-8Ω

Single-ended Input

• THD+N: <0.0005% @4Ω 5W,
• @1kHz A-wt: <0.0004% @8Ω 5W
• THD+N: <0.0015% @4Ω 5W,
• @No-wt 20kBW: <0.0006% @8Ω 5W
• SNR @MAX OUT 1kHz A-wt: 121dB
• Dynamic Range @1kHz A-wt: 121dB
• Frequency Response: 20Hz-40kHz(±0.3dB)
• Output Level: 65Vpp @4Ω, 68Vpp @8Ω
• Noise @A-wt: <15uVrms
• Channel Crosstalk @1kHz: -90dB
• Input sensitivity: 1.3Vrms
• Gain: 25.0dB
• Channel Balance: 0.1 dB
• Output Power
• 100W × 2 @4Ω THD+N<10%
• 100W × 2 @4Ω THD+N<1%
• 85W x 2 @8Ω THD+N<10%
• 65W × 2 @8Ω THD+N<1%
• Adapter Impedance: 4-8Ω

PA5 II Plus Audio Specs

Balanced Input

• THD+N: <0.0004% @4Ω 5W,
• @1kHz A-wt: <0.0003% @8Ω 5W
• THD+N: <0.0015% @4Ω 5W,
• @No-wt 20kBW: <0.0006% @8Ω 5W
• SNR @MAX OUT 1kHz A-wt: 124dB
• Dynamic Range @1kHz A-wt: 124dB
• Frequency Response: 20Hz-40kHz(‡0.3dB)
• Output Level: 65Vpp @4Ω, 68Vpp @8Ω
• Noise @A-wt: <15uVrms
• Channel Crosstalk @1kHz: -106dB
• Input sensitivity: 2.6Vrms
• Gain: 19.2dB
• Channel Balance: 0.1 dB
• Output Power
• 140W × 2 @4Ω THD+N<10%
• 125W × 2 @4Ω THD+N<1%
• 85W × 2 @8Ω THD+N<10%
• 65W × 2 @8Ω THD+N<1%
• Adapter Impedance: 4-8Ω

Single-ended Input

• THD+N: <0.0005% @4Ω 5W,
• @1kHz A-wt: <0.0004% @8Ω 5W
• THD+N: <0.0015% @4Ω 5W,
• @No-wt 20kBW: <0.0006% @8Ω 5W
• SNR @MAX OUT 1kHz A-wt: 121dB
• Dynamic Range @1kHz A-wt: 121dB
• Frequency Response: 20Hz-40kHz(‡0.3dB)
• Output Level: 65Vpp @42, 68Vpp @8Ω
• Noise @A-wt: <15uVrms
• Channel Crosstalk @1kHz: -90dB
• Input sensitivity: 1.3Vrms
• Gain: 25.0dB
• Channel Balance: 0.1 dB
• Output Power
• 140W × 2 @4Ω THD+N<10%
• 125W × 2 @4Ω THD+N<1%
• 85W × 2 @8Ω THD+N<10%
• 65W × 2 @8Ω THD+N<1%
• Adapter Impedance: 4-8Ω

What’s included

• TOPPING PA5 II/ PA5 II Plus
• Power adapter
• Power cable
• Product information card
• Quick start guide