hey
It's hard to define a "best" mid top speaker (or any speaker) as everyone has different criteria. Some want small compact speakers, some have the transport and manpower for massive heavy things etc etc.
However, with that said, the best DIY mid top speakers that are available just now are Peter Morris' designs, plans and 2 long threads of detailed discussion available here.... https://soundforums.net/community/forums/diy-audio.28/" rel="nofollow - https://soundforums.net/community/forums/diy-audio.28/
Horn loaded double 12" plus coax comp driver, built with a 90 degree version for using one a side or a 60 degree horn to double up. They're relatively big compared to a reflex top just because you need room for the two 12" horns, but are still just about compact and light enough that one person can lift them up onto a pole. And they sound better than just about every speaker out there, will easily hold their own even the biggest pro touring companies designs.
But the rub is that the drivers are fairly expensive, and you need capable processing preferably with FIR to get the best out of them (though they do sound amazing by all accounts with just IIR processing too).
And that really is what it comes down to these days for DIY tops, the processing. Wood, paint, grills etc are all relatively cheap nowadays, good very capable drivers are affordable, CNC shops and DIY maker spaces are cheap enough that they'll cut the wood for you far more exact than you could yourself, and will cut rebates and handle holes and things.
So actually building DIY speakers isn't that much of a challenge these days.
Measuring and processing them is where the magic happens. Properly measuring the speakers, choosing crossover points based on dispersion as well as frequency, time aligning and EQing everything properly, all pass filters and FIR processing to correct phase.
Even consumer level powered tops from Yamaha, EV, RCF etc all have fir processing, good limiters etc etc built in these days, and to make DIY worth it this is where the challenge comes. If you can accomplish all of that then as I say those DIY tops from Peter Morris are pretty hard to beat at any price point. But otherwise, second hand tops from a big brand might be the way to go, with all of the processing and measuring taken care of and ready to use.
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