The Audiobarn provided an excellent service for me to choose my next headphone amp and headphones. I had an audition room all to myself to review various headphone amps and headphones. My previous setup was Naim Headphone 1 amp (with crackley volume pot) and Sennheiser HD600. I spent most of a Saturday there. Plenty of tea and judicious, but not pushy advice, to point me in the right direction to satisfy what I wanted out of the combo - quite an education for me and a relevation on what modern equipment can deliver - Wow! Technology has moved on a lot! - Looking forward to the next progression if people invest in these products.