A K12 with pym1298 can hit hard - its about the same size as the Advent. I'm not sure of the optimal placement for a single vent - the diy K12 with Pyle in the trace below was a Karlsonette copy (1954) where I plugged its single horizontal slot vent and hacked a 12 sq.in.vent kinda like K15. Karlson probably knew better than myself.The other K12 is a 6-slit vent type loaded with 12pe32 - smooth midrange.
a pym1298 or its Kappa12a can hit pretty hard in a K12 - subjectively, with a K-tube on top, its got more "grab" than my Klipshorn - but the K-horn goes an octave lower.
K12s are such a kute size ;^)
all speakers under test in the same approximate spot
(I'm a big fan of Henry Kloss)
Karlson Evangelist
Edits: 09/22/16
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Topic - K12 vs large Advent - freddyi 01:48:24 09/22/16 (0)