It also depends how loud you play it. Cornwall are very efficient and are fast, dynamic, clear, bass authority, but subs help.
A 25W Pass will drive them or Luxman or Sugden. The Pass integrated is pricy but excellent. I had an 20W Aegir and it kicked out, thus the Pass. I have a Khozmo passive because gain is not needed. Some like flavor with a preamp.Personally those little 5W tube amps are fine if you don't go over 85dB or so.