Aperture Audio HPA-1 Headphone Amplifier
A composed, technically capable desktop amplifier with excellent ergonomics and a few deliberately conservative choices.
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Amplifiers
How to Evaluate a Headphone Amplifier Beyond Its Maximum Power Rating
Maximum power is one boundary condition. Gain structure, noise, output impedance, and usable control range often matter more.
Why Amplifier Power Specifications Are Frequently Misleading
A power figure without load, bandwidth, channel count, and distortion threshold is closer to marketing than evidence.
Output Impedance Without the Folklore
Output impedance is a system interaction. Its importance depends on the headphone’s own impedance curve.