TOPPING A50s Headphone Amplifier (Apos Certified)

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TOPPING
$153.30
$153.30
$219.99
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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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