Dunno, some 'talked the talk' including for some other designs I did, but none that I can remember ATM 'walked the walk' with any of them. Guess 'life' got in the way like it has me for right at a decade now.
Yeah, when I started building speakers, 4-5 ft^3 was a shelf speaker, but the AR was getting some attention by then and stereo was the coming 'thing' along with SS power, so by the mid 60s the ability to trade efficiency for a much smaller bulk and lower retail price without compromising bass response too much became a marketing tool to 'mine' all the 'baby-boomer' college campus/apartment dwellers and the pressure was on to go into a downsizing 'feeding frenzy'.
For GPA, there's only two choices AFAIK, so 902 for most folks and 909 for the folks that like to go ~'live' on occasion.
Since I don't see it at GPA, find some MR994 Mantarays which is a step up from an 811 and is the same depth, so should work with the M19's adjustable XO with minimal change at most.
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