Hi folks, Now I understand drivers behavior with a crossover regarding impedance. First, it varies with frequency. As a filter works by elevating impedance as high as a frequency goes or as low as a frequency goes, when a crossover is connected youre separating drivers' operation, therefore nominal impedance at each frequency band will be of the driver(s) operating at that band. Usually people crossover the same number of drivers at each side of the crossover, or try to keep nominal impedance equal in low, mid and high bands. In my case I have 3 woofers and 1 mid driver, all of them 8 ohms drivers and a GK MB 500 amp. I can use the following configurations: 1. 210/6 and 1 woofer stays unused for now. If I wire the woofers in parallel I get 4 ohms at the low band which is not good, considering the amp gives 500W@4ohms. So, the way would be to wire them in series and get a 16 ohms cab in the low band and 8 ohms at mid drivers band. The matter is, this variation in impedance from low to mid frequency bands would be sound defective? Or maybe give more relative power to the mid driver? 2. 110/6 and 210. In the 110/6 I can only get 8 ohms through all frequency range, since both drivers are 8 ohms. However using a 200W cab with an amp that produces 350W@8ohms is a bit too much, huh? I'd like to use this cab in case I don't need too much power, in other cases I would wire the 210(16 ohms if woofers are in series) in parallel with it, producing 5.33 ohms load, which would give me a ~375 W limited stack with the amp giving something between 400 and 450 W. I couldn't find anywhere a graph of power output vs impedance for my amp, or the information of power @ 16 ohms and 5.33 ohms. If one can please inform me MB500's output @16 and @5.33 ohms (already mailed GK support and no answer) or even if there's a formula to get it. Waiting to hear from your experience guys!