TOPPING A90 Balanced Headphone amplifier / Preamplifier Silver

TOPPING A90 Balanced Headphone amplifier / Preamplifier Black
A real hammer blow in the headphone amplifier market, the A90 from Topping is a compact unit with exceptional performance.

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Topping A90

Headphone amplifier / preamplifier XLR / RCA




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.


Review by Audio Science Review

...at the distortion and noise levels we are seeing here, you are seeing absolute transparency to the source.

 test by the measurement forum Audio Science Review

Balanced & single-ended connectivity


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.

Volume control, source selection / outputs


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
TypeHeadphone amplifier
Preamplifier
Inputs3-pole XLR balanced stereo
RCA single-ended stereo
Outputs3-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)
ColorSilver



Front panel

A90 Panneau avant connectique
1Power LED
2Output mode switch
3Input switch
4Gain switch
5Balanced headphone output (XLR)
6Balanced headphone output (Jack 4.4mm)
7Headphone output 6.35mm
8Volume knob



Back panel

A90 Panneau avant connectique
1Analog input XLR (R)
2Analog input XLR (L)
3Analog input RCA (L)
4Analog input RCA (R)
5Analog output XLR (R)
6Analog output XLR (L)
7Analog output RCA (L)
8Analog output RCA (R)
9Power input
10Fuse
11Power switch



Headphone amplifier specs
Single-ended Input & Single-ended OutputBalanced Input & Single-ended OutputSingle-ended Input & Balanced OutputBalanced 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)141dB137dB145dB138dB
Dynamic range @ Max Out 1kHz (A-weighted)141dB137dB145dB138dB
Frequency Response20Hz-40kHz (±0.05dB)20Hz-40kHz (±0.01dB)20Hz-40kHz (±0.05dB)20Hz-40kHz (±0.01dB)
Output level9Vpp @ 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 sensitivity9.5Vrms @ 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 power3300mW 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 OutputBalanced Input & Single-ended OutputSingle-ended Input & Balanced OutputBalanced Input & Balanced Output
THD+N @ 1kHz (A-weighted)<0.00006%
THD+N @ 20-20kHz 90kBW<0.0001%
SNR @ Max Out 1kHz (A-weighted)141dB137dB145dB138dB
Plage dynamique @ Max Out 1kHz (A-weighted)141dB137dB145dB138dB
Frequency Response20Hz-40kHz (±0.05dB)20Hz-40kHz (±0.01dB)20Hz-40kHz (±0.05dB)20Hz-40kHz (±0.01dB)
Output level9Vpp @ 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 sensitivity9.5Vrms @ 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 impedance20Ω40Ω
 
Data sheet
InputRCA
InputXLR
OutputRCA
OutputXLR
OutputJack 3.5mm
OutputJack 2.5mm
ColorSilver
 
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TOPPING A90 Balanced Headphone amplifier / Preamplifier Silver
A real hammer blow in the headphone amplifier market, the A90 from Topping is a compact unit with exceptional performance.

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