#1
So, long story short, i have a cab that had its speakers replaced with V30s. Short of opening up the cab and reading the impendance, is there any other way i can check out what it is? Can i just plug in a cable and then measure the impendance with a multimeter? Its been a few months since i used it, and i only plugged it in once, so i forgot what the actual number was, and i was to stupid to write it down...

Thanks!
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#2
Quote by gorkyporky
Can i just plug in a cable and then measure the impendance with a multimeter?
Right or wrong, that's what I do. It gives me a number. I trust it. Haven't blown anything up yet, although I only have solid state amps.
#3
Yes you can just use a cable and get an accurate reading (the shorter the better). I personally use a patch cable or a pedal interconnect/coupler to test cabs.  
#4
The value you measure with a multimeter is DC resistance and will be lower than the speaker's rated impedance. An 8 ohm speaker might measure something like 6.5 ohms. Round the value up to the nearest multiple of 4 and you'll have a pretty close estimate.

Impedance = resistance + reactance