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TOPPING A50 III Headphone Amplifier Silver
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TOPPING A50 III Headphone Amplifier NFCA Silver
With its A50 III headphone amplifier, Topping unveils a compact, high-performance device. It maintains the features of its predecessor, with improvements such as a 3-level gain control and a balanced input on a 6.35mm TRS jack. Its amplifier circuit incorporates an NCFA (Nested Feedback Composite Amplifier) module for exceptional performance. Moreover, the A50 III has a maximum output power of 2x 3500mW, a comfortable reserve that enables it to drive many of the headphones available on the market, including models with up to 300 ohms impedance without difficulty.
TOPPING A50 III: ultra-high-performance NFCA module
The A50 III incorporates a NFCA (Nested Feedback Composite Amplifier) module with hybrid current/voltage architecture combined with UHGF (Ultra High Gain Feedback) technology. This gives the A50 III excellent AC and DC performance. High output current enables the amplifier to accompany all types of headphones. An ultra-low noise level of 0.3µV, a dynamic range of 144dB and the absence of background noise also enable the A50 III to power the most sensitive IEMs with ease.
TOPPING A50 III: high output power
The A50 III's output power enables it to drive headphones with impedances ranging from 32 ohm to 300 ohm. In fact, it can deliver up to 2x 3500mW of power @ 32 ohm and up to 2x 760mW of power @ 300 ohm, all with a THD < 0.01%.
TOPPING A50 III: 2 headphone outputs and 3 gain levels
The A50 III features two headphone outputs, one on a 6.35mm jack and one balanced on a 4.4mm jack. A knob on the front panel selects the 3-level gain setting for the headphone outputs.
TOPPING A50 III: essential connectors
The rear panel of the A50 III features an RCA input and a balanced stereo input on a 6.35mm TRS connector. Added to this is a 12V trigger enabling it to be paired with other devices for simultaneous ignition. Its connectivity makes it the perfect ally for Topping's D50 III DAC.
TOPPING A50 III: a robust aluminum chassis
The A50 III features a CNC-machined aluminum chassis for aesthetic appeal and durability. This aluminum casing also helps dissipate the heat efficiently from the A50 III's amplifier stage.
Topping A50 III overview
| 1 | Switch-on / gain selection |
| 2 | Gain LED indicator |
| 3 | 6.35mm jack headphone output |
| 4 | 4.4mm jack headphone output |
| 5 | Volume control knob |
| 6 | Balanced 6.35mm stereo jack input |
| 7 | Stereo RCA input |
| 8 | Source selection switch |
| 9 | Software update port |
| 10 | 12V Trigger |
| 11 | 15V DC power supply |
Technical characteristics
| Specifications | |
|---|---|
| Product type | Headphone amplifier |
| Inputs | 1x Stereo RCA input 1x Balanced input on 6.35mm TRS jack connector |
| Outputs | 1x 6.35mm headphone output 1x 4.4mm headphone jack output |
| A50 III HEADPHONE AMPLIFIER MEASUREMENTS | ||||
|---|---|---|---|---|
| RCA / Jack 6.35mm | BAL TRS 6.35mm / jack 6.35mm | RCA / Jack 4.4mm | BAL TRS 6.35mm / Jack 4.4mm | |
| THD+N @ 1kHz A-wt | <0.00006% @ 500mw 32 ohm <0.00006% @ 80mw 300 ohm | <0.00007% @ 500mw 32 ohm <0.00006% @ 80mw 300 ohm | <0.00007% @ 2000mw 32 ohm <0.00006% @ 320mw 300 ohm | <0.00012% @ 2000mw 32 ohm <0.00008% @ 320mw 300 ohm |
| THD+N @ 20Hz-20kHz 90kBW | <0.0002% @ 500mw 32 ohm <0.0001% @ 80mw 300 ohm | <0.0005% @ 500mw 32 ohm <0.0003% @ 80mw 300 ohm | <0.0002% @ 2000mw 32 ohm <0.0001% @ 320mw 300 ohm | <0.0001% @ 2000mw 32 ohm <0.0002% @ 320mw 300 ohm |
| SNR @ Max out 1kHz A-wt | 141dB | 136dB | 144dB | 137dB |
| Dynamic range @ 1kHz A-wt | 141dB | 136dB | 144dB | 137dB |
| Frequency response | 20Hz-40kHz (±0.05dB) 10Hz-100kHz (±0.1dB) | 20Hz-40kHz (±0.1dB) 10Hz-100kHz (±0.05dB) | 20Hz-40kHz (±0.05dB) 10Hz-100kHz (±0.1dB) | 20Hz-40kHz (±0.1dB) 10Hz-100kHz (±0.05dB) |
| Output level | 21Vpp @G=L 21Vpp @G=M 21Vpp @G=H | 21Vpp @G=L 21Vpp @G=M 21Vpp @G=H | 18Vpp @G=L 42Vpp @G=M 42Vpp @G=H | 18Vpp @G=L 42Vpp @G=M 42Vpp @G=H |
| Output noise A-wt(Mesures AP) | < 0.7uVrms @G=L < 0.7uVrms @G=M < 1.2uVrms @G=H | < 0.7uVrms @G=L < 0.7uVrms @G=M < 1.1uVrms @G=H | < 0.9uVrms @G=L < 0.9uVrms @G=M < 2.1uVrms @G=H | < 0.9uVrms @G=L < 0.9uVrms @G=M < 2.1uVrms @G=H |
| Output noise A-wt | < 0.3uVrms @G=L < 0.3uVrms @G=M < 1.0uVrms @G=H | < 0.3uVrms @G=L < 0.3uVrms @G=M < 1.0uVrms @G=H | < 0.7uVrms @G=L < 0.7uVrms @G=M < 2.0uVrms @G=H | < 0.7uVrms @G=L < 0.7uVrms @G=M < 2.0uVrms @G=H |
| Input sensitivity | 13Vrms @G=L 8.0Vrms @G=M 1.9Vrms @G=H | 9.2Vrms @G=L 8.0Vrms @G=M 1.9Vrms @G=H | 13Vrms @G=L 7.8Vrms @G=M 1.9Vrms @G=H | 9.2Vrms @G=L 7.8Vrms @G=M 1.9Vrms @G=H |
| Gain | -12.0dB @G=L 0dB @G=M 11.9dB @G=H | -12.0dB @G=L 0dB @G=M 11.7dB @G=H | -6.0dB @G=L 6.0dB @G=M 17.9dB @G=H | -6.0dB @G=L 6.0dB @G=M 17.9dB @G=H |
| Output impedance | < 0.1Ω | < 0.1Ω | < 0.2Ω | < 0.2Ω |
| Input impedance | 10.0kΩ @G=L 2.5kΩ @G=M 2.5kΩ @G=H | 2.0kΩ @G=L 2.0kΩ @G=M 2.0kΩ @G=H | 10.0kΩ @G=L 2.5kΩ @G=M 2.5kΩ @G=H | 2.0kΩ @G=L 2.0kΩ @G=M 2.0kΩ @G=H |
| Output power | 2150mW x2 @ 16Ω THD+N<0.1% 1400mW x2 @ 32Ω THD+N<0.1% 190mW x2 @ 300Ω THD+N<0.1% 100mW x2 @ 600Ω THD+N<0.1% | 3500mW x2 @ 16Ω THD+N<0.1% 2700mW x2 @ 32Ω THD+N<0.1% 760mW x2 @ 300Ω THD+N<0.1% 395mW x2 @ 600Ω THD+N<0.1% | ||
| Load impedance | > 8Ω | |||
| General | |
|---|---|
| Power supply | 15V DC |
| Dimensions | 125 x 140 x 260mm |
| Color | Silver |
| Package | 1x Topping A50 III 1x Power supply adapter 1x 3.5mm jack to 6.35mm jack adapter |
| Input | Jack 6.35mm |
| Input | RCA |
| Output | Jack 4.4mm |
| Output | Jack 6.35mm |
| Color | Silver |
| Class | N/A |
| Remote Control | No |
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