Hello River251,
Yes, when we take a speakers final measurements, we normally see a frequency response chart and a impedance chart. in the impedance chart you will also see a seperate line that measures resistive and capacite load...
This is actually a fairly common practice, many cable manufactures measure cables for resistive and capacitive loads... To put this as non technical as I can: resistance is what it sounds like, it shows how a speaker varies in how hard it is to push within a frequency, Capacitance is a speakers ability to hold a charge at a given frequency...so as frequency varies charts show this curve that goes up and down, as the curve rises, it is going into resistive territory... most tube amps don't mind this, as the curve drops, it is entering capacitive territory, tubes don't tend to like the energy of a capacitive load... Most tubes will tolorate somewhat of a capacitive load. I normally worry when there is a swing of more than 30 or 40 degrees toward capacitive... Take time to look at impedance charts on a few speakers, they aren't hard to find and you will see what we are referring to. I know that i've made this very basic. I hope it makes sense. Tim
