The Aune N7 headphone amplifier is a high-bias class AB design with strong performance

The Aune N7 headphone amplifier is a high-bias class AB device that delivers excellent performance despite being marketed as class A. Testing reveals that the N7 provides nearly 7 watts of power into 32 ohms and approximately 0.8 watts into 300 ohms, meeting its power specifications. The amplifier demonstrates a total harmonic distortion and noise (THD+N) performance better than -110 dB, exceeding the manufacturer's claims. The device features a discrete design, which is uncommon at its $399 price point. It includes both single-ended and balanced inputs and outputs, and can function as a preamplifier. The N7 offers two current modes, high and low, which allow users to adjust the static bias current applied to the transistors. While the high-current mode runs hotter and draws more power, it does not significantly change the amplifier's power capabilities or distortion profile. The N7's volume control uses 1.8 dB steps, and it provides a clear, informative display that includes operating temperature. The build quality is robust, featuring a clean, compact chassis with effective cooling fins.

Tech4K StaffVideo report

The Aune N7 headphone amplifier is a high-bias class AB device that delivers excellent performance despite being marketed as class A. Testing reveals that the N7 provides nearly 7 watts of power into 32 ohms and approximately 0.8 watts into 300 ohms, meeting its power specifications. The amplifier demonstrates a total harmonic distortion and noise (THD+N) performance better than -110 dB, exceeding the manufacturer's claims. The device features a discrete design, which is uncommon at its $399 price point. It includes both single-ended and balanced inputs and outputs, and can function as a preamplifier. The N7 offers two current modes, high and low, which allow users to adjust the static bias current applied to the transistors. While the high-current mode runs hotter and draws more power, it does not significantly change the amplifier's power capabilities or distortion profile. The N7's volume control uses 1.8 dB steps, and it provides a clear, informative display that includes operating temperature. The build quality is robust, featuring a clean, compact chassis with effective cooling fins.

The Aune N7 is a high-bias class AB amplifier rather than a true class A design. The amplifier delivers nearly 7 watts into 32 ohms and 0.8 watts into 300 ohms.

THD+N performance is better than -110 dB, which exceeds the manufacturer's stated specifications. The device features a discrete design and includes both single-ended and balanced connectivity options.

Users can switch between high and low current modes to adjust the transistor bias current. The N7's volume control uses 1.8 dB steps, and the unit includes a comprehensive status display.

Chapter guide

IntroductionOverview of the Aune N7 headphone amplifier and its market positioning.Class A vs Class ABExplanation of amplifier classes and the testing methodology used to verify the N7's design.Build and FeaturesPhysical design, connectivity, and display features of the N7.Performance MeasurementsDetailed analysis of distortion, power output, and noise performance.Current Mode ComparisonComparison of the high and low current modes and their impact on sound.Subjective Sound ImpressionsEvaluation of the N7's sound signature across different music genres.Final ThoughtsConcluding remarks on the N7's value and the importance of accurate manufacturer specifications.

Worth noting

  • The reviewer received the product as part of a care package from Aune.
  • The reviewer notes that the N7 is marketed as class A, but testing confirms it is a high-bias class AB design.

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