It's hard to classify the two subs in the same class. I would say the 8500 is more like the W6 where as the 7500 is like the W3. MTX is using the marketing strong-arm to label one is better than the other. I'm sure in a double blind test, it would be hard to tell the difference, but those with the "golden ear" could tell the difference. The JL will have a lower bass reproduction with a smoother response, the MTX will potentially get louder but the tonal reproduction may not be as clear.