Topping Pre90 Preamplifier

TOPPING

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  • Ultra-High Performance NFCA modules
    Pre90 uses the similar NFCA (Nested Feedback Composite Amplifier) module from flagship A90. Voltage Current hybrid feedback architecture along with UHGF (Ultra High Gain Feedback) technology provides excellent DC and AC performance. Ultra-low noise of 0.3uV is miles ahead of the competition, giving an absurdly high dynamic range of 145dB and no audible noise.

    Fully balanced amplifier structure for both balanced and single-ended signals
    Pre90 adopts a fully balanced structure, which can handle balanced and single-ended signal processing. The output can be balanced, single-ended or balanced and single-ended. With the balanced and single-ended two-way input, in addition to the normal preamplifier usesage, Pre90 can be used for "balanced to single-ended" or "single-ended to balanced" signal conversion.

    A wire with amplification
    An excellent preamp should have top performance, just like a wire that can amplify signals.

    Amplify the weak audio signal to acceptable level
    With the help of maximum gain +16 dB, Pre90 can easily amplify the weak input signal to the acceptable levels of any amplifier. It is worth mentioning that since the noise is as low as 0.3uVrms, this step does not bring in audible noise while amplifying the signal.

    Relay volume control
    A large number of high quality Japanese small signal relays are used for volume control of the Pre90. This brings the advantages of precise control, remote control, longevity, and complete channel balance. If the volume is set to high whilst turning on the Pre90, it will automatically reduced to a safe volume to avoid your speakers/headphones getting damaged.

    Safe Volume, so you don't get shocked
    The safe volume feature on Pre90 will kick in when the saved volume of the target input or output exceeds the set safe volume, and reduces the output to safe volume, protecting your expensive equipments and your priceless hearing. The safe volume function can be turned off in the settings.

    Selectable XLR/RCA output
    The output of Pre90 can be configured to "XLR only", "RCA only" or "XLR and RCA". Therefore, the amplified signal can be connected to two different amplifiers.

    Volume memory for every input or output
    Pre90 can set the volume memory for each input or volume memory for each output. When multiple inputs with different signal strengths are connected, switching the input often requires re-adjusting the volume at the same time. Pre90 can set the volume memory for each input, and automatically adjust to the last volume setting when switching to that input. If Pre90 was set volume memory for each output, then the volume of "XLR output only", "RCA output only", and "XLR and RCA output" will be memorised to adapt to the needs of different amplifiers.

  • • Hi-Res Audio
    • NFCA Modules
    • 0.5dB/Step Volume Control
    • <0.00007% THD+N
    • 6-way input selections (with Ext90)
    • 145dB Dynamic Range
    • <0.3uVrms Noise
    • -140dB Channel Crosstalk

  • Pre90/EXT90 Parameters (@IN=5Vrms Vol=0dB)
    SE IN/SE Out
    BAL IN/SE Out
    BAL IN/BAL Out
    BAL IN/BAL Out

    THD+N @1kHz A-wt

    <0.00007%

    <0.00007%

    <0.00007%

    <0.00007%

    THD @20-20kHz 90kBW

    <0.0003%

    <0.0003%

    <0.0003%

    <0.0003%

    SINAD @1kHz A-wt

    124dB

    124dB

    124dB

    124dB

    SNR @1kHz A-wt 141dB 137dB 145dB 138dB

    Dynamic Range @1kHz A-wt

    141dB

    137dB

    145dB

    138dB

    Frequency Response

    20Hz-100kHz(±0.1dB)

    20Hz-100kHz(±0.1dB)

    20Hz-100kHz(±0.1dB)

    20Hz-100kHz(±0.1dB)

    OutPut Level

    25Vpp

    25Vpp

    50Vpp

    50Vpp

    AP measured noise level @A-wt

    <0.7uVrms

    <0.7uVrms

    <0.9uVrms

    <0.9uVrms

    Actual noise level* @A-wt <0.3uVrms <0.3uVrms <0.6uVrms <0.6uVrms
    Channel Crosstalk @1kHz -130dB -137dB -140dB -140dB
    Channel Balance +10dB - -60dB ±0.5dB +10dB - -60dB ±0.5dB +16dB - -60dB ±0.5dB +16dB - -60dB ±0.5dB
    IMD CCIF @(18kHz+19kHz) -115dB -115dB -115dB -115dB
    IMD SMPTE @(60Hz+7kHz) -115dB@SMPTE4: 1 -115dB@SMPTE4: 1 -115dB@SMPTE4: 1 -115dB@SMPTE4: 1
    Input Sensitivity 9.2Vrms @0dB 9.3Vrms @0dB 9.2Vrms @0dB 9.3Vrms @0dB
    Volume Range +10dB - -99dB +10dB - -99dB +16dB - -99dB +16dB - -99dB
    Output Impedance 20Ω 20Ω 40Ω 40Ω

    Output DC Configuration

    <1mVrms

    <1mVrms

    <1mVrms

    <1mVrms