My 22 watt SET drove the Acoustic Zen Adagio speakers I was using at the time, with better grip and control than 180watt Karan K180 integrated. The Adagios from memory, were 89db sensitivity and dropped to a minimum of 6ohm impedence. So, not all watts are created equal, but I would agree that tubes do'nt match well with low impedence. I would say 6ohms ideally, as a theoretical minimum.
As always though, you get suprisingly effective matches which should'nt work and visa versa.
The moral, try before you buy.
As always though, you get suprisingly effective matches which should'nt work and visa versa.
The moral, try before you buy.