Since the 1980s, I've been asking every speaker designer I meet, "What amplifier do you recommend using with your speakers?" Annoyingly, they always say, "My speakers are easy to drive. Any amp will do." Whereupon I'd whine, "Aww, come on man, don't feed me that. What amp did you use when you were designing the speaker?" The closest any manufacturer came to providing a real answer was Wendell Diller of Magnepan, who, when I reviewed his .7 quasi-ribbon speaker, said, "We used an amp of our own design. It's not for sale.