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Topping challenges the whole market of headphone amplifiers with its A90 : an exceptional performance desktop headphone amplifier / preamplifier. With a SINAD up to 123dB (measured by Audio Science Review) on its balanced output and an incredibly low distortion of 0.000086%, the A90 significantly expands the boundaries of what most advanced home audio equipment can offer.
Topping A90 has a stereo balanced input XLR 3-pole and an single-ended input stereo RCA connector on its rear face . It offers a balanced (XLR) / single--ended (RCA) as preamplified output.
The connectors dedicated to the headphone amplifier are located on the front panel. A90 has all the connections necessary to easily connect headphones / IEM with various characteristics and requirements: a balanced output on XLR 4-pole connector, a second balanced output on jack TRRS 4.4mm connector Balanced headphone outputs are capable of delivering a power of 250mW and have an output impedance of 0135 Ω.
Finally tthe frontpanel offers an unbalanced output on 6.35mm connector with a power output of 125mW.
The preamplifier / headphone amplifier A90 provides a volume control through a rotary knob directly accessible from its facade.
On its front side, three selectors allow easy control of all the device functions to immediately find the best configuration for your setup.
A first selector allows selecting the output mode and can switch between preamplifier mode and headset amplifier mode. These two modes can not be active simultaneously. This switch is also used to turn off the device.
A second bipolar selector serves as source selection and allows the user to select between balanced and single-ended input. It is therefore possible to connect two separate devices on each of these inputs and use the A90 as simple source selector.
The last selector is a gain control with three levels (low gain / medium gain / high gain) to get the best performance according to your sources and the type of headphones used.
| SPECIFICATIONS | |
|---|---|
| Type | Headphone amplifier Preamplifier |
| Inputs | 3-pole XLR balanced stereo RCA single-ended stereo |
| Outputs | 3-pole XLR balanced stereo RCA single-ended stereo XLR 4-pole balanced Jack TRRS 4.4mm balanced Jack 6.35mm single-ended |
| Power supply |
Integrated (SMPS) Power cable included |
| Output impedance | 0.135Ω (balanced) |
| Color |
Black |
| HEADPHONE AMPLIFIER SPECS | ||||
|---|---|---|---|---|
| Single-ended Input & Single-ended Output | Balanced Input & Single-ended Output | Single-ended Input & Balanced Output | Balanced Input & Balanced Output | |
| THD+N @ 1kHz (A-weighted) | <0.00007% @ 500mW (32Ω) <0.00006% @ 80mW (300Ω) |
<0.00009% @ 500mW (32Ω) <0.00006% @ 80mW (300Ω) |
<0.00007% @ 2000mW (32Ω) <0.00006% @ 320mW (300Ω) |
<0.00009% @ 2000mW (32Ω) <0.00006% @ 320mW (300Ω) |
| THD+N @ 20-20kHz 90kBW | <0.00004% @ 500mW (32Ω) <0.00001% @ 80mW (300Ω) |
<0.00004% @ 2000mW (32Ω) <0.00001% @ 320mW (300Ω) |
||
| SNR @ Max Out 1kHz (A-weighted) | 141dB | 137dB | 145dB | 138dB |
| Dynamic range @ Max Out 1kHz (A-weighted) | 141dB | 137dB | 145dB | 138dB |
| Frequency Response | 20Hz-40kHz (±0.05dB) | 20Hz-40kHz (±0.01dB) | 20Hz-40kHz (±0.05dB) | 20Hz-40kHz (±0.01dB) |
| Output level | 9Vpp @ Gain = low 25Vpp @Gain = medium 25Vpp @Gain = high |
18Vpp @ Gain = low 49Vpp @Gain = medium 49Vpp @Gain = high |
||
| Noise level (Audio Precision / A-weighted) | <0.7uVrms @ Gain = low <0.7uVrms @ Gain = medium <0.9uVrms @ Gain = high |
<0.9uVrms @ Gain = low <0.9uVrms @ Gain = medium <1.4uVrms @ Gain = high |
||
| Noise level (Extrapolation / A-weighted) | <0.2uVrms @ Gain = low <0.2uVrms @ Gain = medium <0.6uVrms @ Gain = high |
<0.6uVrms @ Gain = low <0.6uVrms @ Gain = medium <1.3uVrms @ Gain = high |
||
| Crosstalk @ 1kHz | -106dB | -102dB | -105dB | |
| IMD CCIF @ 18kHz +19kHz | -118dB | |||
| IMD SMPTE @ 60Hz +7kHz | -110dB @ SMPTE4 : 1 -115dB @ SMPTE1 : 1 |
|||
| Input sensitivity | 9.5Vrms @ Gain = low 8.8Vrms @ Gain = medium 2.9Vrms @ Gain = high |
|||
| Gain | -9.5dB @ Gain = low 0dB @ Gain = medium 9.5dB @ Gain = high |
-3.5dB @ Gain = low 6dB @ Gain = medium 15.5dB @ Gain = high |
||
| Output impedance | <0.1Ω | <0.2Ω | ||
| Output power | 3300mW x 2 @ 16Ω THD+N<0.1% 2000mW x 2 @ 32Ω THD+N<0.1% 250mW x 2 @ 300Ω THD+N<0.1% 125mW x 2 @ 600Ω THD+N<0.1% |
7600mW x 2 @ 16Ω THD+N<0.1% 6400mW x 2 @ 32Ω THD+N<0.1% 1000mW x 2 @ 300Ω THD+N<0.1% 500mW x 2 @ 600Ω THD+N<0.1% |
||
| Load impedance | >8Ω | |||
| PREAMPLIFIER SPECS | ||||
|---|---|---|---|---|
| Single-ended Input & Single-ended Output | Balanced Input & Single-ended Output | Single-ended Input & Balanced Output | Balanced Input & Balanced Output | |
| THD+N @ 1kHz (A-weighted) | <0.00006% | |||
| THD+N @ 20-20kHz 90kBW | <0.0001% | |||
| SNR @ Max Out 1kHz (A-weighted) | 141dB | 137dB | 145dB | 138dB |
| Plage dynamique @ Max Out 1kHz (A-weighted) | 141dB | 137dB | 145dB | 138dB |
| Frequency Response | 20Hz-40kHz (±0.05dB) | 20Hz-40kHz (±0.01dB) | 20Hz-40kHz (±0.05dB) | 20Hz-40kHz (±0.01dB) |
| Output level | 9Vpp @ Gain = bas 25Vpp @Gain = moyen 25Vpp @Gain = haut |
18Vpp @ Gain = bas 49Vpp @Gain = moyen 49Vpp @Gain = haut |
||
| Noise level (Audio Precision / A-weighted) | <0.7uVrms @ Gain = bas <0.7uVrms @ Gain = moyen <0.9uVrms @ Gain = haut |
<0.9uVrms @ Gain = bas <0.9uVrms @ Gain = moyen <1.4uVrms @ Gain = haut |
||
| Noise level (Extrapolation / A-weighted) | <0.2uVrms @ Gain = bas <0.2uVrms @ Gain = moyen <0.6uVrms @ Gain = haut |
<0.6uVrms @ Gain = bas <0.6uVrms @ Gain = moyen <1.3uVrms @ Gain = haut |
||
| Crosstalk @ 1kHz | -106dB | -102dB | -105dB | -102dB |
| IMD CCIF @ 18kHz +19kHz | -118dB | |||
| IMD SMPTE @ 60Hz +7kHz | -110dB @ SMPTE4 : 1 -115dB @ SMPTE1 : 1 |
|||
| Input sensitivity | 9.5Vrms @ Gain = bas 8.8Vrms @ Gain = moyen 2.9Vrms @ Gain = haut |
|||
| Gain | -9.5dB @ Gain = bas 0dB @ Gain = moyen 9.5dB @ Gain = haut |
-3.5dB @ Gain = bas 6dB @ Gain = moyen 15.5dB @ Gain = haut |
||
| Output impedance | 20Ω | 40Ω | ||
