The Pass Labs HPA-1c (photo by Juan C. Ayllon) If you don't already own one, you've probably seen them on the equipment racks of high profile audio reviewers: rugged and utilitarian, a milled metal block with an oversized volume knob that sounds sumptuous. For the past two years, I've been enjoying the lush delivery of … Continue reading Pass Labs Lowers the Noise Floor with Its Newly Minted HPA-1c Headphone Amplifier