Originally Posted by tjh
Clark, many of your ??'s can probably be answered in the sticky "FAQ" at the top of this section ... the 'speaker ohm rating' would probably be better searched under the term 'impedance', and supply a plethora of information as well ...
^+1. Best way to avoid salespeople that spout nonsense.
Bare basics, the impedance of a cab is not a fixed value they have a nominal figure in ohms.
0 ohms impedance is a direct short (very heavy load on amps and usually destroy SS amps).
As the impedance to flow goes up the less it can load an amp. If the amp says 4 ohm minimum do not combine cabs that will equal less than 4 ohms (two 4 ohm cabs on an amp's outputs equals 2 ohms).
Amps put out power in watts and make no sound until that power goes into a speaker cab.