HPA-1 vs Burson Audio Soloist GT4
The Soloist GT4's thd is 0.002% against the HPA-1's 0.005%, its output impedance 25Ω against 2Ω, and its input impedance 38000Ω against 50000Ω. Both share class (A).
Both turn up in the same documented systems.
AI-generated product photo — not official manufacturer imagery.
HPA-1
Pass LabsAmplifiersHeadphone AmplifiersPre-AmplifiersDiscontinued
Estimated price (community-sourced)
$2,750
Around — community and catalog average, updates slowly
About the HPA-1
The Pass Labs HPA-1 is a discrete, solid-state, pure Class A headphone amplifier that also functions as a line-level preamplifier. It uses a MOSFET-based current-feedback design with a JFET input stage, direct-coupled complementary MOSFET output stage, and low-feedback circuitry. The amplifier is designed to drive headphones from approximately 15 to 600 ohms, including demanding planar-magnetic models. It has two single-ended RCA inputs, a single-ended RCA preamplifier output, and one locking 1/4-inch (6.35 mm) headphone output. It contains no DAC, digital inputs, balanced headphone output, wireless connectivity, remote control, or streaming functionality. Pass Labs lists the HPA-1 among its legacy products; the newer HPA-1c is the current related model, so the original HPA-1 should be considered discontinued or no longer in regular production.
Specifications
Analog Output
Analog signal output specifications
- THD
- 0.005%
- Output Impedance
- 2Ω
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- RCA
- Analog Outputs
- RCA
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 279.4 × 101.6 × 342.9 mm (W × H × D)
- Weight
- 6.35 kg (14 lbs)
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions