TOPPING A90 DISCRETE Discrete Balanced Headphone Amplifier Preamplifier Black

TOPPING A90D Discrete Balanced Headphone Amplifier Preamplifier Black New
Topping returns with the A90 Discrete, an improvement of the previous A90, this time equipped with discrete components. Both a headphone amplifier and a preamplifier, it incorporates a discrete NFCA amplifier stage capable of supporting most headphones on the market. Its careful design using many high-end components allows it to deliver a rich, clear and transparent sound.

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Topping A90 Discrete

Discrete Balanced Headphone Amplifier Preamplifier Black

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

Topping returns with the A90 Discrete, an improvement of the previous A90, this time equipped with discrete components. Both a headphone amplifier and a preamplifier, it incorporates a discrete NFCA amplifier stage capable of supporting most headphones on the market. Its careful design using many high-end components allows it to deliver a rich, clear and transparent sound.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

Discrete NFCA amplifier

Topping's A90 Discrete features a Nested Feedback Composite Amplifier (NFCA) stage based on the use of discrete components. The four integrated discrete NFCA modules each use 39 transistors in a balanced design. The optimized hybrid voltage/current feedback architecture and Ultra High Gain Feedback (UHGF) technology provide excellent DC and AC performance. With this new design, the A90 Discrete benefits from high output power, allowing it to accompany both high-sensitivity headphones and high-impedance headphones effortlessly. Precisely matched ultra-low noise transistors connected in parallel ensure extremely low noise and distortion.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

High output voltage and current

The Topping A90 Discrete offers both high output voltage and current. The former allows the amplifier to accompany high impedance headphones without difficulty, while the latter provides sufficient power for low sensitivity headphones.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

Two gain settings

The unit also offers two different gain settings to accommodate an ever-growing array of headphones: low gain for high-sensitivity headphones, high gain for the most demanding headphones. Combined with a noise level of only 0.2µVrms, even the most sensitive IEMs will not suffer from any noise.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

Elimination of mass loops

A ground loop can occur when several devices are used together. Therefore, the A90 Discrete provides a GND/LIFT switch to solve this problem. In normal use, if no sound fault occurs, the switch can be set to GND. Otherwise, if a ground loop is encountered, the switch should be set to LIFT.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

Integrated preamplifier

In addition to its headphone amplifier section, the A90 Discrete includes a preamp circuit. In preamp mode, you get the same performance as in headphone amplifier mode. The single-ended 20Ω and balanced 40Ω outputs allow to accompany many amplifiers. Moreover the two modes can be used simultaneously and the remote control allows to access each function easily.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

12V Trigger

The A90 Discrete is equipped with a 12V trigger that can work as an active control (trigger output) or passive control (trigger input). Thus, the A90 Discrete can be switched on and off in full synchronization with other 12V triggered devices in your audio system.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

Custom volume control

The Topping A90 Discrete uses an R2R volume control, composed of relays and resistors. It offers extremely precise control, perfect channel balance and excellent durability.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique

Possibility of extension

The A90 Discrete can be combined with the Topping EXT90, the latter offering a possibility of extension of the connectivity of the device. With the EXT90 connected, you will have four XLR inputs and two RCA inputs in total..

The Topping EXT90 is sold separately.

Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique
Topping A90 Discrete Amplificateur Casque Préamplificateur Discret Symétrique
1Input LED
2Output LED
3IR Receiver
4Power LED
5Volume indicator
6Balanced XLR 4 pins headphone output
7Balanced Jack 4.4mm headphone output
8Single-ended Jack 6.35mm headphone output
9Multi-function button
10USB interface for firmware update
11Balanced XLR input
12Balanced XLR output
1312V Trigger interface
14Power connector
15Extension interface
16Single-ended RCA input
17Single-ended RCA input
18GND/LIFT Switch
19Power switch

Technical characteristics

Specifications
Product typeHeadphone amplifier
Preamplifier
Inputs1x Balanced stereo XLR
1x Single-ended stereo RCA
Outputs1x Balanced stereo XLR
1x Single-ended stereo RCA
1x Balanced Jack 4.4mm headphone output
1xBalanced XLR 4 pins headphone output
1x Single-ended Jack 6.35mm headphone output
Discrete headphone amplifier performance
SE Input/ SE OutputBAL Input / SE OutputSE Input / BAL OutputBAL Input / BAL Output
THD+N @ 1kHz (A-Weighting)< 0.000065% @ 500mW, 32Ω< 0.00008% @ 500mW, 32Ω< 0.000065% @ 2000mW, 32Ω< 0.00008% @ 2000mW, 32Ω
< 0.000055% @ 80mW, 300Ω< 0.00006% @ 80mW, 300Ω< 0.000055% @ 320mW, 300Ω< 0.00006% @ 500mW, 300Ω
THD+N @ 20Hz-20kHz (90kBW)< 0.0003% @ 500mW, 32Ω< 0.0003% @ 500mW, 32Ω< 0.0006% @ 2000mW, 32Ω< 0.0006% @ 2000mW, 32Ω
< 0.00025% @ 80mW, 300Ω< 0.00025% @ 80mW, 300Ω< 0.00025% @ 320mW, 300Ω< 0.00025% @ 320mW, 300Ω
SNR @ Max Out, 1kHz (A-Weighting)141dB137dB145dB138dB
Dynamic range @ 1kHz (A-Weighting)141dB137dB145dB138dB
Frequency response20Hz-40kHz (±0.1dB)20Hz-40kHz (±0.1dB)20Hz-40kHz (±0.1dB)20Hz-40kHz (±0.1dB)
Output level25Vpp25Vpp49Vpp49Vpp
Measured noise level @ A-Weighting< 0.7µVrms @ G=L< 0.7µVrms @ G=L< 1µVrms @ G=L< 1µVrms @ G=L
< 1.1µVrms @ G=H< 1.1µVrms @ G=H< 1.8µVrms @ G=H< 1.8µVrms @ G=H
Actual noise level @ A-Weighting< 0.2µVrms @ G=L< 0.2µVrms @ G=L< 0.7µVrms @ G=L< 0.7µVrms @ G=L
< 0.6µVrms @ G=H< 0.6µVrms @ G=H< 1.6µVrms @ G=H< 1.6µVrms @ G=H
Channel crosstalk @ 1kHz-107dB-105dB-116dB-113dB
Input sensitivity9.1Vrms @ G=L9.3Vrms % @ G=L9.1Vrms % @ G=L9.3Vrms % @ G=L
3Vrms @ G=H3Vrms @ G=H3Vrms @ G=H3Vrms @ G=H
Gain0db @ G=L-0.2dB @ G=L6dB @ G=L5.8dB @ G=L
9.5dB @ G=H9.3dB @ G=H15.5dB @ G=H15.3dB @ G=H
Output power< 0.1Ω< 0.1Ω< 0.2Ω< 0.2Ω
Output impedance2x 3300mW @ 16Ω, THD+N < 0.1%
2x 2000mW @ 32Ω, THD+N < 0.1%
2x 1100mW @ 64Ω, THD+N < 0.1%
2x 250mW @ 300Ω, THD+N < 0.1%
2x 9800mW @ 16Ω, THD+N < 0.1%
2x 6700mW @ 32Ω, THD+N < 0.1%
2x 4000mW @ 64Ω, THD+N < 0.1%
2x 1000mW @ 300Ω, THD+N < 0.1%
2x 500mW @ 600Ω, THD+N < 0.1%
Load impedance> 8Ω
Discrete preamplifier performances
SE Input / SE OutputBAL Input / SE OutputSE Input / BAL OutputBAL Input / BAL Output
THD+N @ 1kHz (A-Weighting)< 0.000055%< 0.00006%< 0.000055%< 0.00006%
THD+N @ 20Hz-20kHz (90kBW)< 0.00025%< 0.00025%< 0.00025%< 0.00025%
SNR @ 1kHz (A-Weighting)141dB137dB145dB138dB
Dynamic range@ 1kHz (A-Weighting)141dB137dB145dB138dB
Frequency response20Hz-40kHz (±0.1dB)20Hz-40kHz (±0.1dB)20Hz-40kHz (±0.1dB)20Hz-40kHz (±0.1dB)
Output level25Vpp25Vpp49Vpp49Vpp
Measured noise level @ A-Weighting< 0.7µVrms @ G=L< 0.7µVrms @ G=L< 1µVrms @ G=L< 1µVrms @ G=L
< 1.1µVrms @ G=H< 1.1µVrms @ G=H< 1.8µVrms @ G=H< 1.8µVrms @ G=H
Actual noise level @ A-Weighting< 0.2µVrms @ G=L< 0.2µVrms @ G=L< 0.7µVrms @ G=L< 0.7µVrms @ G=L
< 0.6µVrms @ G=H< 0.6µVrms @ G=H< 1.6µVrms @ G=H< 1.6µVrms @ G=H
Channel crosstalk @ 1kHz-107dB-105dB-116dB-113dB
Input sensitivity9.1Vrms @ G=L9.3Vrms % @ G=L9.1Vrms % @ G=L9.3Vrms % @ G=L
3Vrms @ G=H3Vrms @ G=H3Vrms @ G=H3Vrms @ G=H
Gain0db @ G=L-0.2dB @ G=L6dB @ G=L5.8dB @ G=L
9.5dB @ G=H9.3dB @ G=H15.5dB @ G=H15.3dB @ G=H
Load impedance20Ω20Ω20Ω20Ω
General
Supply voltage100-240VAC 50/60Hz
Dimensions222 x 160 x 45mm
ColorBlack
Package1x Topping A90 Discrete
1x Remote control
1x Powre cable
1x Male Jack 6.35mm to female Jack 3.5mm adapter
 
Data sheet
InputXLR
InputRCA
OutputJack 6.35mm
OutputXLR
OutputJack 4.4mm
OutputRCA
ColorBlack
ClassClass A / AB
Remote ControlYes
 
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TOPPING A90 DISCRETE Discrete Balanced Headphone Amplifier Preamplifier Black
Topping returns with the A90 Discrete, an improvement of the previous A90, this time equipped with discrete components. Both a headphone amplifier...

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