Sweet! Mine calcs as ~1.34 acres with [8] huge trees, one with [4] full size trunks, one with [3] and two with [2], two <20 ft but seriously 'bushy' and a bunch of < 8 fters I keep stunted for privacy and a few < 4 fters for cheap decoration. This year is first time there wasn't enough roof, back or front yard area to sunbathe except down near the streets [corner lot].
My knowledge of the MQ101 is from an RSVP audition a bit before its release IIRC and for whatever reason the tekkie told me it wouldn't work properly on my horn system without some $modding$ even though I had an all Mac separates tube system at the time, so circa '70-71. Best to ask McIntosh.
Vent = 4" dia. x ~0.75" [baffle thickness] centered up 7" from the bottom [i.d.].
GM



At 18.5" for a 15", it's a bit tight, so will need some damping stuck in gaps. OK, then at 48" won't be able to get the ears on axis with the driver at 36.75" [i.d.] from the baffle bottom/37.5" [o.d.] floor, but lucky you have an amp the driver was made for, so will boost the horn's extreme HF a bit, making it maybe OK off axis; otherwise may need a bypass cap to 'let through' extreme highs and worst case you have to add a proper CD horn EQ filter to it.
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