I'm selling some older cabs, and a guy called and asked if I had read them with a multimeter. He claimed that when a speaker starts to go bad from age, its ohm reading will rise significantly. I've never heard of such a thing. Now, obviously if a speaker totally fails and becomes a dead open then its resistance goes up a bit; but aside from that, is there any truth to his claim? BTW these speakers read exactly the way they should, about 6 ohms for an 8 ohm impedance.