Topping A90 Balanced Headphone Amplifier

TOPPING

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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.

  • 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.

  • 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