TOPPING A50s Headphone Amplifier

Although a dead ringer for its predecessor, the TOPPING A50s is a headphone amp with specs that outshine the A50 in nearly every way. 

Don’t Look Down

With a THD+N of 0.00007% and SNR of 143dB, the TOPPING A50s’ noise floor is so far down you might get dizzy. Compare this to the original A50, which has a THD+N of <0.0004% and an SNR of 123dB. 

The Power Hitter

The TOPPING A50s swings for the fences with its output power, driving a whopping 3,500W x2 @32Ω (more than 1,000mW more powerful than the A50). With that sort of power, you can drive anything from sensitive IEMs to power demanding headphones. 

6.35 Single-Ended and 4.4 Balanced Outs

The A50s offers both a 6.35 single-ended and a 4.4 balanced out on its front plate. Both options deliver stellar dynamic range (138dB/144dB) and output impedance (<0.1Ω/0.2Ω). 

High-Low Gain Setting

Drive high impedance headphones with ease thanks to the A50s’ high-low gain setting of 0dB/6dB at the SE output and 6dB/12dB at the balanced output. 

Specs

• THD+N @1 kHz A-wt

• 6.35mm headphone jack

• <0.00007% @Output=850mW(32Ω)

• <0.00006% @Output=90mW(300Ω)

• 4 4mm Balanced headphone jack

• <0.00007% @Output=3.4W(32Ω)

• <0.00006% @Output=367mW(300Ω)

• THD ©20-20kHz 90kBW

• 6.35mm headphone jack

• <0.0004% @Output=720mW(32Ω)

• <0.0002% @Output=77mW(300Ω)

• 4 4mm Balanced headphone jack

• <0.001% @Output=2.88W(32Ω)

• <0.0005% @Output=307mVV(300Ω)

• SNR @MAX OUT 1 kHz A-wt

• 6.35mm headphone jack: 137dB

• 4 4mm Balanced headphone jack: 143dB

• Dynamic Range @1 kHz A-wt 

• 6.35mm headphone jack: 138dB

• 4 4mm Balanced headphone jack: 144dB

• Frequency Response: 20Hz-200kHz(±0.05dB)

• Output Level 

• 6.35mm headphone jack: 21Vpp

• 4 4mm Balanced headphone jack: 42Vpp

• AP measured noise level @A-wt

• 6.35mm headphone jack

• <0.7uVrms @G=L

• <0.8uVrms @G=H

• 4 4mm Balanced headphone jack

• <0.9uVrms @G=L 

• <1.1uVrms @G=H

• Actual noise level * @A-wt

• 6.35mm headphone jack

• <0.3uVrms @G=L 

• <0.45uVrms @G=H 

• 4 4mm Balanced headphone jack

• <0.6uVrms @G=L 

• <0.95uVrms @G=H

• Channel Crosstalk @ 1kHz

• 6.35mm headphone jack: -86dB

• 4 4mm Balanced headphone jack: -128dB

• IMD CCIF@(18kHz + 19kHz)

• 6.35mm headphone jack: -116dB

• 4 4mm Balanced headphone jack: -116dB

• IMD SMPTE @(60Hz + 7kHz)

• 6.35mm headphone jack

• -110dB, SMPTE4: 1

• -118dB, SMPTE1: 1

• 4 4mm Balanced headphone jack

• -110dB, SMPTE4: 1

• -118dB, SMPTE1: 1

• Input Sensitivity

• 6.35mm headphone jack

• 7.5Vrms @G=0dB

• 3.8Vrms @G=6dB

• 4 4mm Balanced headphone jack

• 7.5Vrms @G=odB

• -3.8Vrms @G=6dB

• Gain

• 6.35mm headphone jack

• 0.0dB @G=0dB

• 6.0dB @G=6dB

• 4 4mm Balanced headphone jack

• 6.0dB @G=0dB

• 12.0dB @G=6dB

• Output Impedance 

• 6.35mm headphone jack: <0.1Ω

• 4 4mm Balanced headphone jack: <0.2Ω

• Output Power THD+N<1%

• 6.35mm headphone jack

• 1.4W x 2 @32Ω

• 192mW x 2 @300Ω

• 4 4mm Balanced headphone jack

• 3.5W x 2 @32Ω

• 760mW x 2 @300Ω

• Output Power @2Vrms 

• 6.35mm headphone jack

• 485mW x 2 @32Ω

• 52mW x 2 @300Ω

• 4 4mm Balanced headphone jack

• 1950mW x 2 @32Ω

• 208mW x 2 @300Ω

• Load Impedance

• 6.35mm headphone jack: >8Ω

• 4 4mm Balanced headphone jack: >8Ω

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• 45-Day Return