TOPPING LA90 Class AB Power Amplifier (Apos Certified)

$674.25 $899

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This is an Apos Certified product. That means it's refurbished, like new, final sale, carries an Apos Certified One-Year Warranty, and ships from our US facility. Currently, Apos Certified products are only available to customers with a US shipping address. We appreciate your understanding as we aspire to expand our offerings to a broader audience in the future.

The comeback of the linear amplifier

The TOPPING LA90 is breaking new ground. With near-perfect square wave performance and the lowest noise performance of existing power amplifiers, it reaches a new level of accuracy and performance that will leave you speechless.

Rock solid 

A high-precision CNC-machined all-aluminum housing provides the LA90 with extreme protection. A built-in heat sink provides reliable and fast heat dissipation for the amplifier circuit.

Low distortion, outstanding power

The LA90 has a THD+N of 0.00007% @8Ω10W–which is as low as a top-notch DAC. This spells more accurate reproduction of music. The LA90 has a very wide working range with low distortion under load. Even in the commonly used 4Ω load 1W-60W output and 8Ω load 1W-40W output, the LA90 keeps distortion around 0.0001%.

Mono and stereo modes

The LA90 can be configured in a common stereo two-channel mode or in a high-power mono mode.

Product highlights

  • 110W x 2 @4Ω 
  • 0.00007% THD+N
  • 140dB SNR
  • 2-step gain setting
  • 3 x XLR / TRS inputs


  • THD+N @1kHz (A-wt)
    • Stereo: 
      • <0.00009% @4Ω 5W
      • <0.00009% @8Ω 5W 
    • Mono: 
      • <0.0001% @8Ω 5W  
  • THD+N @No-wt (90kBw) 
    • Stereo:
      • <0.0017% @4Ω 5W 
      • <0.0009% @8Ω 5W 
    • Mono:
      • <0.0012% @8Ω 5W 
  • SNR @A-wt 
    • Stereo: 140dB
    • Mono: 142dB
  • Dynamic range @A-wt 
    • Stereo: 140dB
    • Mono: 142dB
  • Frequency response
    • Stereo
      • 20Hz - 40kHz (±0.2dB)
      • 10Hz - 100kHz (±1dB)
    • Mono
      • 20Hz - 40kHz (0.2dB±)
      • 10Hz - 100kHz (±1.0dB)
  • Output level
    • Stereo
      • 51Vpp @4Ω 
      • 58Vpp @4Ω 
    • Mono
      • 98Vpp @8Ω 
  • Noise @A-wt 
    • Stereo:
      • <2.0uVrms @G=L
      • <3.5Vrms @G=H 
    • Mono
      • <2.8uVrms @G=L 
      • <5.0uVrms @G=H 
  • Channel crosstalk: -138dB
  • Input sensitivity 
    • Stereo: 
      • 6.9Vrms @G=L 
      • 2.2Vrms @G=H
    • Mono
      • 15.5dB @G=L 
      • 25.2dB @G=H 
  • Gain
    • Stereo
      • 9.5dB @G=L 
      • 19.2dB @G=H
    • Mono
      • 15.5dB @G=L 
      • 25.2dB @G=H
  • Channel imbalance: 0.2dB
  • Output impedance
    • Stereo: <3mΩ
    • Mono: <5mΩ
  • Output power
    • Stereo
      • 110W x 2 @4Ω THD+N<10%
      • 90W x 2 @4Ω THD+N<1%
      • 65W x 2 @8Ω THD+N<10%
      • 50W x 2 @8Ω THD+N<1%
    • Mono
      • 220W x 1 @8Ω THD+N<10%
      • 180W x 1 @8Ω THD+N<1%
  • Load impedance
    • Stereo: ≥4Ω
    • Mono: ≥8Ω

What’s included

  • AC to DC power adapter
  • Jumper cable
  • AC cable
  • User manual
  • Warranty card

What pairs well 

Featured reviews

"The Topping LA90 integrated a stunning level of achievement." - Audio Science Review

Professional Product Review of TOPPING LA90 Class AB Power Amplifier (Apos Certified)

TOPPING LA90 Class AB Power Amplifier (Apos Certified) User Manual Download

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