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TOPPING A50S Balanced Headphone Amplifier Preamplifier Silver
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Accessories for this product
Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.
Topping A50s
Balanced Headphone Amplifier Preamplifier Silver
With the A50s, Topping offers a high quality headphone amplifier and sedentary preamplifier combo, integrating both balanced and unbalanced connections. Its optimized circuits, based on very good audio components, allow a precise, detailed and musical restitution. The A50s is also designed to be versatile, capable of adapting to the vast majority of headphones and earphones on the market, including demanding models.
Ultra high performance NFCA module
At the heart of the A50s is an NFCA (Nested Feedback Composite Amplifier) module, identical to the one used in the brand's flagship, the A90. Its hybrid current/voltage architecture associated with UHGF (Ultra High Gain Feedback) technology offers excellent DC and AC performance. A high output current allows 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 allow the A50s to easily power the most sensitive EMIs.
Robust aluminium housing
The components of the A50s are integrated in a solid Aluminium frame, CNC machined with high precision. Extremely robust, it also provides excellent heat dissipation to effectively remove heat from the power supply and AOPs of the unit.
Balanced & Single-ended
Although the A50s has only an unbalanced input, it has a balanced amplifier circuit. It can therefore be used with unbalanced headphones on its 6.35mm jack output, or with balanced headphones on its 4.4mm jack output.
Adjustable gain
The Topping amplifier offers a gain setting of 0dB or 6dB in unbalanced mode, or 6dB and 12dB in balanced mode. Once again, this setting, coupled with an ultra-low noise of 0.3µVrms, allows the A50s to adapt to both sensitive EMIs and headphones requiring a high energy input.
An excellent preamplifier
If the main function of the A50s is headphone amplification, it is also a very good preamplifier with excellent performance. In preamplification mode, the output impedance is only 20Ω, ensuring compatibility with many devices.
Automatic switching
When the A50s is not connected to headphones or earphones, it automatically switches to preamplifier mode, with the amplified signal outputting through the RCA output on the rear panel. Conversely, if headphones are connected to the 6.35mm or 4.4mm jack outputs, the unit instantly switches to headphone amplifier function.
| 1 | ON/OFF Switch Gain selector |
| 2 | Gain indicator |
| 3 | Jack 6.35mm single-ended headphone output |
| 4 | Jack 4.4mm balanced headphone output |
| 5 | Volume button |
| 6 | Right channel RCA analog input |
| 7 | Left channel RCA analog input |
| 8 | Right channel RCA preamp output |
| 9 | Left channel RCA preamp output |
| 10 | Power connector |
Technical characteristics
| Specifications | |
|---|---|
| Product type | Headphone amplifier Preampliier |
| Input | 1x Stereo RCA |
| Outputs | 1x Single-ended Jack 6.35mm headphone output 1x Balanced Jack 4.4mm headphone output 1x Stereo RCA preamp output |
| THD+N | Single-ended headphone output Jack 6.35mm : < 0.00007% @ 850mW, 32Ω, 1kHz, A-Weighting Single-ended headphone output Jack 6.35mm : < 0.00006% @ 90mW, 300Ω, 1kHz, A-Weighting Balanced headphone output Jack 4.4mm : < 0.00007% @ 3.4W, 32Ω, 1kHz, A-Weighting Balanced headphone output Jack 4.4mm : < 0.00006% @ 367mW, 300Ω, 1kHz, A-Weighting |
| THD | Single-ended headphone output Jack 6.35mm : < 0.0004% @ 720mW, 32Ω, 20Hz-20kHz, 90kBW Single-ended headphone output Jack 6.35mm : < 0.0002% @ 77mW, 300Ω, 20Hz-20kHz, 90kBW Balanced headphone output Jack 4.4mm : < 0.001% @ 2.88W, 32Ω, 20Hz-20kHz, 90kBW Balanced headphone output Jack 4.4mm : < 0.0005% @ 307mW, 300Ω, 20Hz-20kHz, 90kBW |
| SNR | Single-ended headphone output Jack 6.35mm : 137dB @ MAX OUT, 1kHz, A-Weighting Balanced headphone output Jack 4.4mm : 143dB @ MAX OUT, 1kHz, A-Weighting |
| Dynamic range | Single-ended headphone output Jack 6.35mm : 138dB @ 1kHz, A-Weighting Balanced headphone output Jack 4.4mm : 144dB @ 1kHz, A-Weighting |
| Frequency response | Single-ended headphone output Jack 6.35mm : 20Hz - 200kHz (±0.05dB) Balanced headphone output Jack 4.4mm : 20Hz - 200kHz (±0.05dB) |
| Output level | Single-ended headphone output Jack 6.35mm : 21Vpp Balanced headphone output Jack 4.4mm : 42Vpp |
| Noise level | Single-ended headphone output Jack 6.35mm : < 0.3µVrms @ G=L, A-Weighting Single-ended headphone output Jack 6.35mm : < 0.45µVrms @ G=H, A-Weighting Balanced headphone output Jack 4.4mm : < 0.6µVrms @ G=L, A-Weighting Balanced headphone output Jack 4.4mm : < 0.95µVrms @ G=H, A-Weighting |
| Crosstalk | Single-ended headphone output Jack 6.35mm : -86dB @ 1kHz Balanced headphone output Jack 4.4mm : -128dB @ 1kHz |
| IMD CCIF | Single-ended headphone output Jack 6.35mm : -116dB @ 18kHz + 19kHz Balanced headphone output Jack 4.4mm : -116 @ 18kHz + 19kHz |
| IMD SMPTE | Single-ended headphone output Jack 6.35mm : -110dB, SMPTE4:1 @ 60Hz + 7kHz Single-ended headphone output Jack 6.35mm : -118dB, SMPTE1:1 @ 60Hz + 7kHz Balanced headphone output Jack 4.4mm : -110dB, SMPTE4:1 @ 60Hz + 7kHz Balanced headphone output Jack 4.4mm : -118dB, SMPTE1:1 @ 60Hz + 7kHz |
| Input sensitivity | Single-ended headphone output Jack 6.35mm : 7.5Vrms @ G=0dB Single-ended headphone output Jack 6.35mm : 3.8Vrms @ G=6dB Balanced headphone output Jack 4.4mm : 7.5Vrms @ G=0dB Balanced headphone output Jack 4.4mm : 3.8Vrms @ G=6dB |
| Gain | Single-ended headphone output Jack 6.35mm : 0dB @ G=0dB Single-ended headphone output Jack 6.35mm : 6dB @ G=6dB Balanced headphone output Jack 4.4mm : 6dB @ G=0dB Balanced headphone output Jack 4.4mm : 12dB @ G=6dB |
| Output impedance | Single-ended headphone output Jack 6.35mm : < 0.1Ω Balanced headphone output Jack 4.4mm : < 0.2Ω |
| Output power @ THD+N < 1% | Single-ended headphone output Jack 6.35mm : 2x 1.4W @ 32Ω Single-ended headphone output Jack 6.35mm : 2x 192mW @ 300Ω Balanced headphone output Jack 4.4mm : 2x 3.5W @ 32Ω Balanced headphone output Jack 4.4mm : 2x 760mW @ 300Ω |
| Output power @ 2Vrms IN | Single-ended headphone output Jack 6.35mm : 2x 485mW @ 32Ω Single-ended headphone output Jack 6.35mm : 2x 52mW @ 300Ω Balanced headphone output Jack 4.4mm : 2x 1950mWW @ 32Ω Balanced headphone output Jack 4.4mm : 2x 208mW @ 300Ω |
| Load impedance | Single-ended headphone output Jack 6.35mm : > 8Ω Balanced headphone output Jack 4.4mm : > 8Ω |
| General | |
|---|---|
| Power supply (included) | 15VDC |
| Housing material | Aluminum |
| Dimensions | 11 x 12.3 x 2.6cm |
| Color | Silver |
| Package | 1x Topping A50s 1x Male Jack 6.35mm to female Jack 3.5mm 1x Power supply |
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