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