Listening to Peter Gabriel's latest album UP on Thiel 6s right now powered by a Krell 400cx. The extremely deep bass is very quick, deep and punchy and very defined. It is simple: you have to power these speakers correctly. They need current, it's as simple as that. Jim is VERY clear about this in his literature and dealers are careful to point this out to prospective customers.
It's not Thiel's fault, but instead a design choice that works.
It's not Thiel's fault, but instead a design choice that works.