Chanting for men

While I prefer a more "traditional" interpretation of Chant to that of Solesmes, I do note that the scholas of monasteries (Benedictine, Heiligenkreuz) and traditionalist/EF order seminaries (FSSP, ICRSS) seem to be dominated by tenors?

Why is there a perceived absence of men with voices in the lower ranges? For at least one seminary, the schola is constituted of men who have been screened, so that the final product has an "acoustically pure" -- I wouldn't be surprised if this happens at monasteries as well. You would want to put the best voices forward. But that doesn't completely explain the absence of basses (and baritones?). Do all of them sing so badly? Or have they been taught to blend their voices in with the higher ranges?

I remember JC writing he liked the chant of Ensemble Organum because of the deep, manly voices.



Some Mozarabic chant:


Listening to Ensemble Organum and other experiments with a more "Eastern" sound, I can't help but ask if the use of organum has been tainted for some because of its association with the SSJ. But this may not be a concern for those who were familiar with the SSJ.

Ensemble Organum - Kyrie (Orbis Factor)
with female voices


A contrast:
Missa " ORBIS FACTOR", Gregoriano, Giovanni Vianini, Schola Gregoriana Mediolanensis, Milano, Italia