KLH Model 5 question

Speakers don't require power. You do. The louder you want, the more power you need. So the question is, how much power do YOU require?

millercarbon

Speakers don’t require power. You do. The louder you want, the more power you need. So the question is, how much power do YOU require?

That’s not a very helpful response because, of course, speakers do require power. They won’t make sound without it. And different speakers can have completely different power requirements, from a little flea-powered tube amp to kilowatt ss amplifiers.

I wish I has some familiarity with the KLH 5 so that I could offer some useful information.

Twenty five watts is a good recommendation! My KLH 6's work well with my Dynaco ST70 tube amp (35 wpc).

Being an acoustic suspension type like the Kloss designed Advent, I would say they would need a good amount of power to come alive. Here is some info on them and it says a minimum of 25 watts. 

https://stereonomono.blogspot.com/2016/06/klh-model-five.html

Those vintage AR and KLH acoustic suspension speakers were built back in the day when 25 watt (PP 6L6G's) tube amps were common. These sealed-box speakers sacrificed sensitivity for lower bass extension. Which they do quite well!