For speaker cable I’d recommend a heavy-duty 1/4” plug like the Switchraft 184, 184L or 188, not the light-duty plugs you find at Radio Shack. They are large-barrel connectors with holes large enough to accept speaker cable, and substantial solder terminals better able to handle the extra heat needed for heavy-gauge wire.
The high sensitivity rating only means it doesn’t take a lot of power to get them to the same volume levels as “regular” home speakers. IOW, you’ll find that you’ll get greater volume with a lower setting on the receiver or amp than you’re used to.
Just treat them as you would any other speaker and run them at any level you feel comfortable with. Or louder if you prefer. A benefit of pro-grade speakers like these is that they are able to play at high volume levels for long periods of time. Most home speakers can’t handle that kind of stress.
Regards,
Wayne A. Pflughaupt