Additional searching online led me to a post by GM in the DIYaudio/Multi-way speakers forum from 2014:
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Don't know of any article, but Altec recommended <6 ft^3 for ducted port and >6 ft^3 for bass reflex. 7.5 ft^3 was optimum sealed.
The M19 is a ~ 8.35 ft^3 net BR, so not too large since a T/S max flat is around 12.3 ft^3 and the pioneer's so called 'ideal' alignment makes it ~18.38 ft^3 for a Fs tuning using the original T/S specs.
Note that the 416-8C was audibly under-damped in the M19 though, so this may be where the confusion lies.
I did two different downsized M19s for some folks; one that condensed it into a simple rectangular cab of the same net Vb rather than the three cab + base assembly and the other is downsized closer to a M14 with a slot duct vent, but if they got built I don?t remember them posting/PMing anything.
Regardless, it obviously can be shrunk quite a bit using ~aperiodic loading with the trade-off of course being a higher F3, etc..
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Which indicates a different path: instead of making the Flamenco cabinets into the equivalent model 19 cabinets (in terms of effective internal volume), may be the Flamenco cabinets fall into GM's second suggestion: A down size M19 cabinet closer to a M14. At this point, I have no idea what the internal volume of the model 14 is, but the Flamencos seem to fit the 6 cubit ft ideal recommended by Altec. May be I am already there...:-)
GM
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