TOPPING A90 Balanced Headphone amplifier / Preamplifier Black

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
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

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

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

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

Input	RCA
Input	XLR
Output	Jack 3.5mm
Output	Jack 2.5mm
Output	RCA
Output	XLR
Color	Black
Class	N/A
Remote Control	No

Parfait
J'ai un Monolith DAC/AMP THX et ai eu un Monolith AMP THX 887 (le A90 le remplace, le Monolith ayant eu un soucis ou niveau du switch de gain) et bien... je trouvais déjà les 2 Monolith parfait, mais le A90 arrive quand-même à se hisser, certes d'un chouia, au dessus. C'est un vrai régale pour les oreilles.
La construction respire la qualité (à voir dans le temps, ceci ayant été le soucis du Monolith, que je recommande tout de même car cela semble plus être un soucis "pas de bol" qu'un soucis de qualité de fabrication).
Super content.
Je recommande sans hésiter.

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