Topping - A90D, Desktop Headphone Amplifier - Black
Topping - A90 Discrete - ( A90D) Balanced Headphone Amplifier & Preamp (Black)
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Desktop Headphone Amplifier
Topping - A90 Discrete
(Black)
Fully Discrete Balanced Headphone AmplifierThe Topping A90 Discrete is made using fully discrete components as a redesign of the NFCA (Nested Feedeback Composit Amplifier) module. Featuring 4 built-in NFCA-Discrete modules, each using 39 transistors to build up a fully balanced structure. The optimized Voltage Current hybrid feedback architecture together with UHGF (Ultra High Gain Feedback) technology both offer incredible DC and AC performance.
Thanks to the new design, the output capability is stronger than ever, which enables the amp to drive low impedance headphones even more effortlessly. The paralleled ultra low noise precision matched transistors built-in ensure the unparalleled distortion and noise performance.
145dBDynamic Range
20Hz - 40kHzFrequency Response
9800mWx2Output Power
At A Glance
• Headamp/pre-amp with NFCA discrete modules
• 4-pin XLR, 4.4 balanced, 6.35mm SE outputs
• Ground loop noise terminator
• 9800mW x2 output power
• R2R relay volume control
• 2 gain settings
A Preamp & A Headphone Amp
Even more usableAlong with driving the headphones, the A90 Discrete also works as a preamp. When in preamp mode, you get the same high performance as the headphone amp mode. The 20 ohm SE and 40 ohm balanced output impedance are also widely suitable for multiple power amplifiers.
The A90 Discrete can switch between the headphone amp (only output from the headphone jack) and the preamp (only output from RCA and XLR) but also supports the output from them all at the same time. The full-featured makes it more convenient for you to control.
Volume Memory
Auto RecallA90 Discrete is capable of memorizing the output or input volume. This means the A90 Discrete remembers the volume settings of the PRE, HPA, PRE + HPA mode respectively and automatically restore to the last used volume next time the same output is selected.
The same works When memorizing the input volumes, so they will all automatically restore to the previously set input volume, saving you from setting it each time.
Accommodates For All Headphones
Easy To DriveThe A90 Discrete can easily drive different types of headphones as the low output impedance doesn't add any unnecessary effects on FR when driving low-impedance headphones. High output voltage can easily drive high impedance headphones and high output current allows low-sensitivity headphones to obtain enough power.
2 Gain SettingsFeaturing two gain options the A90 Discrete has enough to cover a wide range of headphones: low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears. Together with the 0.2uVrms ultra-low noise, even the sensitive IEMs dont suffer from any noise.
GND/LIFT SwitchTo solve the issue of ground loop noise, the A90 Discrete features a GND/LIFT switch. When being used normally set it to GND, then when you encounter a ground loop noise, switch it to LIFT, then the ground loop noise will be eliminated.
12V Trigger InterfaceA 12V Trigger interface is included which can be set to active control (Trigger out) or passive control (Trigger in). Using just a single 3.5mm to 35.mm cable, the A90 Discrete can be turned on and off synchronously with other devices equipped with a 12V Trigger interface.
Customize Volume ControlA90 Discrete uses an R2R volume control made up of relays and resistor networks, brining out the advantages of precise control, longevity, complete channel balanced and remote control.
The Tech Spec
| Features | Specification | THD+N @ 1kHz (A-wt) | SE IN/SE OUT: <0.000065% @ Output = 500mW (32Ω) / <0.000065% @ Output = 80mW (300Ω) BAL IN/SE OUT: <0.000080% @ Output = 500mW (32Ω) / <0.000060% @ Output = 80mW (300Ω) SE IN/BAL OUT: <0.000065% @ Output = 2000mW (32Ω) / <0.000055% @ Output = 320mW (300Ω) BAL IN/BAL OUT: <0.000080% @ Output = 2000mW (32Ω) / <0.000060% @ Output = 320mW (300Ω) |
|---|---|
| THD @ 20-20kHz (90kBW) | SE IN/SE OUT: <0.000030% @ Output = 500mW (32Ω) / <0.000025% @ Output = 80mW (300Ω) BAL IN/SE OUT: <0.000030% @ Output = 500mW (32Ω) / <0.000025% @ Output = 80mW (300Ω) SE IN/BAL OUT: <0.000060% @ Output = 2000mW (32Ω) / <0.000025% @ Output = 320mW (300Ω) BAL IN/BAL OUT: <0.000060% @ Output = 2000mW (32Ω) / <0.000025% @ Output = 320mW (300Ω) |
| SNR @ MAX OUT 1kHz (A-wt) | SE IN/SE OUT: 141dB BAL IN/SE OUT: 137dB SE IN/BAL OUT: 145dB BAL IN/BAL OUT: 138dB |
| Dynamic Range @ 1kHz (A-wt) | SE IN/SE OUT: 141dB BAL IN/SE OUT: 137dB SE IN/BAL OUT: 145dB BAL IN/BAL OUT: 138dB |
| Frequency Response | 20Hz - 40kHz |
| Output Level | SE IN/SE OUT & BAL IN/SE OUT: 25Vpp SE IN/BAL OUT & BAL IN/BAL OUT: 49Vpp |
| AP Measured Noise Level @ A-wt | SE IN/SE OUT & BAL IN/SE OUT: <0.7uVrms @ G=L / <1.1uVrms @ G=H SE IN/BAL OUT & BAL IN/BAL OUT: <1.0uVrms @ G=L / <1.8uVrms @ G=H |
| Actual Noise Level @ A-wt | SE IN/SE OUT & BAL IN/SE OUT: <0.2uVrms @ G=L / <0.6uVrms @ G=H SE IN/BAL OUT & BAL IN/BAL OUT: <0.7uVrms @ G=L / <1.6uVrms @ G=H |
| Channel Crosstalk @ 1kHz | SE IN/SE OUT & BAL IN/SE OUT: -107dB BAL IN/SE OUT: -105dB SE IN/BAL OUT: 116dB BAL IN/BAL OUT: 113dB |
| Input Sensitivity | SE IN/SE OUT: 9.1Vrms @ G=L / 3.0Vrms @ G=H BAL IN/SE OUT: 9.3Vrms @ G=L / 3.0Vrms @ G=H SE IN/BAL OUT: 9.1Vrms @ G=L / 3.0Vrms @ G=H BAL IN/BAL OUT: 9.3Vrms @ G=L / 3.0Vrms @ G=H |
| Gain | SE IN/SE OUT: 0dB @ G=L / 9.5dB @ G=H BAL IN/SE OUT: -0.2dB @ G=L / 9.3dB @ G=H SE IN/BAL OUT: 6.0dB @ G=L / 15.5dB @ G=H BAL IN/BAL OUT: 5.8dB @ G=L / 15.3dB @ G=H |
| Output Impedance | SE IN/SE OUT & BAL IN/SE OUT: <0.1Ω SE IN/BAL OUT & BAL IN/BAL OUT: <0.2Ω |
| Output Power | SE IN/SE OUT & BAL IN/SE OUT: 3300mW x 2 @ 16Ω THD+N<0.1%, 2000mW x 2 @ 32Ω THD+N<0.1%, 1100mW x 2 @ 64Ω THD+N<0.1%, 250mW x 2 @ 300Ω THD+N<0.1% SE IN/BAL OUT & BAL IN/BAL OUT: 9800mW x 2 @ 16Ω THD+N<0.1%, 6700mW x 2 @ 32Ω THD+N<0.1%, 4000mW x 2 @ 64Ω THD+N<0.1%, 1000mW x 2 @ 300Ω THD+N<0.1%, 500mW x 2 @ 600Ω THD+N<0.1% |
| Load Impedance | >8Ω |
