@wrm57 @bjesien Yes. You need some power for that speaker and more than just 20 watts (but it has to have clean power; that 1st watt in particular) if you really want to hear what it can do.
Using a lower power SET on this speaker is a waste of time. While it is pretty efficient, to use a 4-watt SET you'll need efficiency well over 100dB, since with any SET you really don't want to ask more than 20-25% of full power. IME you need at least 60 watts on a speaker like this in most rooms. So 18 watts really won't do it either. Consequently its no surprise that the Plinius did so well, since you'll never get close to running it out of gas.
Using a lower power SET on this speaker is a waste of time. While it is pretty efficient, to use a 4-watt SET you'll need efficiency well over 100dB, since with any SET you really don't want to ask more than 20-25% of full power. IME you need at least 60 watts on a speaker like this in most rooms. So 18 watts really won't do it either. Consequently its no surprise that the Plinius did so well, since you'll never get close to running it out of gas.