I can't comment on the sound, but from a fairly close look at the plans I think the bass cabinet is straightforward, the treble cabinet is optional, and the mid-range horn is the tricky one. I think I am going to buy the mid-range horn kit as a way of simplifying that part of the construction. Wayne and others have posted a lot on the relative capabilities of the different levels - do a search on Pi 7 or just scan the forum. A lot of people ask questions of the form "which speaker should I build", and Wayne has patiently answered them.
I guess the summary from what I've read is that you get what you pay for, and in particular the shorting ring on the JBL woofer makes for a significant reduction in distortion.
I'm planning to build the Professional Pi 7 because I don't want to have to make the investment twice. However easy or difficult the build (and I don't think it's trivial, but it does seem manageable), it requires a significant investment of time and money, so to me it seems a pity to put anything other than the best components in there.
tim
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