The 20/20s used a different dome tweeter, updated midrange drivers and different woofers. Actually all 3 on the 20/20 differ from each other. The upper 12 on the front is a transition driver between the lower 12s and the midranges. The house sound is similar, but IMO better with the 20/20. I can’t tell you if the difference would be worth it to you or not.
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