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Welcome! Need support, you got it. Or share your ideas and experiences.

RE: "extending the lower bass of the panels" ...

The 20.7's definitely can go down that low.

Also, if your XPA-1's are like my XPA-2 was, they have a wooly, prominent midbass compared to my A-21. I have no idea why that should be the case since they both have high damping factors and they're feeding a mostly non-reactive load. There shouldn't be a difference, but there is.

Some sonic differences are easy to explain -- crossover notch distortion, harmonic distortion spectrum, impedance interaction, instability, RFI -- but I continue to be mystified by some of the differences that I hear.

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