Pensil 11 box can accommodate MAOP 11.2?

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Hello all. Trying an alpair 7pluvia in a old TL box adapted. Not ideal but still was to get a glimpse of alpair. Now want more and asked a woodmaker to do pensil 11 and add 350 gr polyfill each. Am I limited to 11ms or maop can work well too? Listening to femal vocals and guitar, jazz or Portuguese and priority number one lifelike voice without highs fatigue. Saw the 11 ma peak above 12khz and wonder if maop is more mitigated on highs or I am telling stupid things as not caught the essence of this drivers into a speaker.
Sound wise I look for nuances and finesse and some bass energy when switch to ecm jazz collection. Thanxs
 
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Thanxs Dave. Is it really that important to have a back opening? The woodmaker asked me this as he believe can do a better job sealing in full after polyfill is placed all around... But then If the fine tuning cannot be done just with placement(I have no limits in my room) then will ask the mandatory opening
 
Looking at datasheet of the pluvia 11 and 11 ms which are the advised for pensil 11 I saw the pluvia has a lot similarity with maop 11.2 ,so I guess the question is responded
Pluvia qms/qes/qts. 1.78/0.35/0..29
Maop 11.2. 1.87/0.35/0.29

The ms11, the other suggested driver for pencil 11 is much more different
2.2/0.4/0.34