With the Prima Luna in 4ohm triode mode which is it’s healthier looking output, you haven’t got a lot of grunt there to play with.
I think out of the two speakers you mentioned the Druid is by far the better match impedance wise and efficiency wise if you like their sound.
http://www.6moons.com/audioreviews/zu20/plot1_big.png
To me I would like the Revels better, "with the right amp" but this graph of the 208 is said to be similar to the 206 as you can see there are current hungry loads at 30hz and 60-150hz and again at 3khz all with highish -phase angles.
https://www.stereophile.com/images/714R208fig1.jpg
My suggestion is to keep the Revels and get the right amp, which will then drive "most" things down the track.
Cheers George
I think out of the two speakers you mentioned the Druid is by far the better match impedance wise and efficiency wise if you like their sound.
http://www.6moons.com/audioreviews/zu20/plot1_big.png
To me I would like the Revels better, "with the right amp" but this graph of the 208 is said to be similar to the 206 as you can see there are current hungry loads at 30hz and 60-150hz and again at 3khz all with highish -phase angles.
https://www.stereophile.com/images/714R208fig1.jpg
My suggestion is to keep the Revels and get the right amp, which will then drive "most" things down the track.
Cheers George