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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