HPA4 - Made in the USA
Benchmark products are designed, manufactured and shipped from our headquarters in Syracuse, NY, USA.
Watch the final assembly and test of a Benchmark HPA4 headphone amplifier. Our skilled technicians take pride in building durable and robust products for professional and hi-fi applications.
The Benchmark HPA4 Headphone Amplifier
- THX-888 Headphone Amplifier featuring Feed-Forward Error Correction
- Entire Signal Path is Relay Controlled
- 256-Step Relay-Controlled Volume
- Lowest Noise, Lowest Distortion Preamplifier Available
- International Power Supply
- High Power Headphone Output
- Independent Line-Level Output
- Certified for Pro or Hi-Fi Applications
- Supports full Studio-Level Balanced Inputs and Outputs
- 0.1 Hz to 500 kHz Bandwidth
The Benchmark LA4
- Identical to the HPA4, but without the Headphone Amplifier



