Great info from Greenboy here, but I just want to clarify some minor spec-stuff, as after 3 "no's" via pm's here I found a guy who will at least experiment with a protoype of my dual-6"-cube. Yes, there will be anomalies, like Avatar's tb153, but plenty are liking that cab. I just wanna come-up with something inexpensive that fills a niche and doesn't depend on others' designs, as I need some small income from music-tech stuff (esp. after 2 builders ran-off with my c/o-eq-pedal design). Others too, like me, have physical disabilities meaning they must buy premade products rather than being able to diy stuff--even from kits.
^Gotcha. I've done the full-range to the drummer and have a list of pros and cons. Some cons include bass-bleed into the drum-mics, and just overkill in basements (wives will love the efficient, bell-like mids and lack of woofing, lol) and on small-stages. Taking gb's advice, I decided on a rolloff slope at 125Hz when load is 16ohms (barely noticeable when using the cube alone) but about 350Hz at 5ohms (that is, when combined with an 8ohm cab. Again, no crossover involved, just a 1-cap passive rolloff on the 2 mid-drivers.) And the slope is only -6dB per octave, so there'll still be lots of chunk around the still-"embodied" 175Hz. The 4-octaves between 250Hz-4kHz will be perfect though--unlike 10"s which scoop there so when you bi-amp them you don't get much more than a hissy tweeter. :=( :=( (I despise 10"s! lol.)
^This stuff is just beyond me. Unless someone wants to volunteer any advice, I'll just have the 2 Eminence Alpha 6a"s mounted in an 8" square cube. (I think my builder has driver-data-software too.) The single-cap rolloff defeats the low-bass, so I don't see the need for porting--it's basically just 2 mid-boxes combined, but angled 90-degrees away for versatile dispersion. I want to use this with my guitar amp too.
Last quote below here links to others besides here curious about a simple (under $300), mid-satellite better suited than a tweet or a (scooped) 10":
