To simplify, based on the impedance curves above, Wilson likes to parallel two 8 inch woofers in their Puppy cab which gives you a low impedance in some specific lower frequencies. This seems to be done in all the models throughout the decades. Obviously, Wilson and others like the way that makes the low frequency sound. So, saying it is wrong to do that, is maybe looking at it in the wrong context... For example, Wilson assuming that the customer will use an amp that can drive a 2.x ohm load for some specific lower frequencies may sound better to them than using a lesser quality amp and changing the woofers wiring/crossover to achieve a higher ohm load. The context may be to take account the quality of the amp together with the speaker crossover/wiring -- Wilson may be looking for that little additional edge in bass sound from a total system. So, when making assumptions, we should assume both the postive and negative. One thing I can tell you is that everybody that has heard my W/P 8 loves the bass coming out of those things. Subwoofer not required.
