I just bought this cab for $475 used. It seemed like a good deal but I am not sure. Sounds great, I was impressed when I heard it. Anyhow, the plate on the back of the cab that you plug the cords into, it says " 4 ohms normal impadence" but this spec chart taken right from bagend.com says that this model is 8 ohms. *** is that all about? Bag End Q10X-D Model: Q10X-D Impedance: 8 Ohms Continuous Sine Wave Power Handling: 800 W Peak Music Program Power Handling: 1600 W Sensitivity 1 Watt/1 Meter: 103 dB SPL Frequency Response: 50-20kHz Crossover Frequency 3.7kHz Parallel Input Connectors: 1/4", Banana, and Speakon Dimensions HxWxD (in inches): 27x22x12 Net Weight (in pounds): 92 Components: 3- E-10, 1-E-10X The cab I own says its a "Q10X-D and 4ohms normal impadence" but above it says "impadence 8 ohms" what am I missing?