Hi Frontier1, your speakers though advertised at nominal 4ohms, is not showing the whole picture. As the lab test results show in the link, they have an amp hungry impedance with -phase angle load of 1.7ohms in the bass. They maybe efficient but they are a hard load.
This to me says if you want to get the very best out of them, especially in the bass, you need an amp that gives good current, the ability to almost double it's watts down to 2ohms.
EG:
50w into 8ohms
100w into 4ohms
200w into 2ohms
These amps are good solid state with BJT (bipolar) output stages (not mosfet)This is also why even good P/P tube amps will wimp out a little down low, even with 4ohm taps.
http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0CC8QFjAC&url=http%3A%2F%2Fwww.perfect-sense.se%2Fwp-content%2Fuploads%2F2014%2F11%2FSF_Olympica-II_Hifi_News_2014.pdf&ei=JN58VIbNE4bc8AXerICgCA&usg=AFQjCNH3FtXaUGr8-3B3--LdKjP2VA7QYA&bvm=bv.80642063,d.dGc
Cheers George
This to me says if you want to get the very best out of them, especially in the bass, you need an amp that gives good current, the ability to almost double it's watts down to 2ohms.
EG:
50w into 8ohms
100w into 4ohms
200w into 2ohms
These amps are good solid state with BJT (bipolar) output stages (not mosfet)This is also why even good P/P tube amps will wimp out a little down low, even with 4ohm taps.
http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0CC8QFjAC&url=http%3A%2F%2Fwww.perfect-sense.se%2Fwp-content%2Fuploads%2F2014%2F11%2FSF_Olympica-II_Hifi_News_2014.pdf&ei=JN58VIbNE4bc8AXerICgCA&usg=AFQjCNH3FtXaUGr8-3B3--LdKjP2VA7QYA&bvm=bv.80642063,d.dGc
Cheers George