Just for the heck of it I decided to check the resistance (ohm value) of my 4 ohm cabinet and found that it was a 3.1 ohm cabinet. My amp is rated for 4 ohms. I installed a 10 watt/1 ohm resistor in series with my speakers and now have a 4.1 ohm cabinet. It makes me feel better but I'm not sure if it was really necessary and can't hear any difference. Has anyone else encountered this situation or done anything about it? Thanks for any ideas.