Topping PA5 II PLUS Class D Balanced Amplifier 

Fully balanced 

The newly developed Class D amplification circuit uses multiple novel optimization techniques to fully push the performance and output power to the maximum. The new circuit provides crisp, clean and deep sound with completely inaudible noise floor. The fully balanced structure makes PA5 II Plus no more hum, no more noise, no more ground loop.

The PA5 II Plus is capable of delivering up to 140 W x 2 for 4 Ohm loads at 10% distortion, and 125W x 2 for 4 ohm loads, even when the standard is raised to 1% distortion. 

Specifications

Inputs: Single-ended stereo RCA; Balanced Jack 6.35mm TRS

Output: Speaker terminals

Trigger: 12V

Balanced input specifications:

THD+N (@ 1kHz, A-Weighted): < 0.0004% @ 4Ω 5W // < 0.0003% @ 8Ω 5W

THD+N (@ No-Weighted, 20kBW): < 0.0015% @ 4Ω 5W // < 0.0006% @ 8Ω 5W

SNR: 124dB (@ max out, 1kHz, A-Weighted)

Dynamic range: 124dB (@ 1kHz, A-Weighted)

Frequency response: 20Hz - 40kHz (±0.3dB)

Output level: 65Vpp @ 4Ω // 68Vpp @ 8Ω

Noise: < 15µVrms (@ A-Weighted)

Crosstalk: -106dB (@ 1kHz)

Input sensitivity: 2.6Vrms

Gain: 19.2dB

Channel balance: 0.1dB

Output power: 2x140W @ 4Ω, THD+N < 10% // 2x125W @ 4Ω THD+N < 1% // 2x85W @ 8Ω, THD+N < 10% // 2x65W @ 8Ω, THD+N <1%

Single-ended input specifications:

THD+N (@ 1kHz, A-Weighted): < 0.0005% @ 4Ω 5W // < 0.0004% @ 8Ω 5W

THD+N (@ No-Weighted, 20kBW): < 0.0015% @ 4Ω 5W // < 0.0006% @ 8Ω 5W

SNR: 121dB (@ sortie max, 1kHz, A-Weighted)

Dynamic range: 121dB (@ 1kHz, A-Weighted)

Frequency response: 20Hz - 40kHz (±0.3dB)

Output level: 65Vpp @ 4Ω // 68Vpp @ 8Ω

Noise: < 15µVrms (@ A-Weighted)

Crosstalk: -90dB (@ 1kHz)

Input sensitivity: 1.3Vrms

Gain: 25dB

Channel balanced: 0.1dB

Output power: 2x140W @ 4Ω, THD+N < 10% // 2x125W @ 4Ω THD+N < 1% // 2x85W @ 8Ω, THD+N < 10% // 2x65W @ 8Ω, THD+N <1%

General specifications

Supply voltage: 38VDC 3A

Power consumption: < 0.5W

Dimensions: 129*166*41mm

In the box: Topping PA5 II Plus, Power supply