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“Enter the Pass Labs HPA-1: it’s a powerful and versatile, standout headphone amp that can double as a superb preamplifier for a two channel speaker system. Boasting the iconic and minimalistic machined aluminum chassis typical of Pass Labs, it delivers a deeply satisfying, vivid, and robust aural experience”
Driven by the need to replace end-of-life components, the HPA-1c features an upgraded power supply and improved circuit board grounding. These updates deliver a cleaner, more stable power foundation—resulting in lower noise, tighter regulation, and a blacker background.
We've also added local regulation to the servo circuitry and achieved approximately a 10 dB improvement in overall noise performance. The result? Greater low-level detail and improved clarity, especially with high-sensitivity headphones where it matters most.
In addition to its excellence as a headphone amplifier, the HPA-1c continues to function as a high-performance line-level preamplifier. With its discrete, class A design and robust output stage, it's equally at home at the heart of a reference speaker system.
Headphone Output:
The HPA-1 delivers up to 2 watts into 32 ohms, with a low output impedance of 2 Ohms.
It's designed to drive most dynamic and planar magnetic headphones with authority, including low-impedance and high-sensitivity models.
Preamplifier Output:
The preamp section is capable of driving a typical power amplifier load (10kΩ or higher) with very low output impedance.
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Gain (dB): 8 db
Frequency Response: 10hz – 100k-1 dB
Output Power into 20 ohms: 3500 mW
THD + Noise: < 0.005 at 1V out
Out Power into 300 ohms: 200 mW
Input Impedance: 50K Ohm
Output Impedance: < 2 ohms
Power Consumption (Watts): 23
Unit Dimension (W x D x H) (In.): 11 x 13.5 x 4
Unit Weight (LBS): 14
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