I was just playing around with my Yorkville 210 cabinet and for no reason at all decided to measure the impedance. It said 6.2 Ohms. That cabinet is supposed to be an 8 Ohm cabinet. The cabinet works perfectly. Is there an agreement between manufacturers to say that a cab is 8 ohms or 4 ohms even if their impedance is off by an ohm or two? Or is there something wrong with my cabinet?