I have some old Infinity Studio Monitor 100s (circa 1987)which I'm using as my fronts. Is there anywhere online I can find out what their efficiency is? I don't have an SPL meter or any equipment to measure it. Or does anyone have an estimate? They are 2-way speakers with a 10" woofer and a fairly large enclosure (approx. 14" x 12" x 40"). I'd also like to find out their min/max power handling specs.