The problem with checking out the specs is that the relevant one on the EP125v3 is outdated, and certainly should be corrected by Axiom. The variable 60Hz-120Hz low pass filter(not a full crossover)which previously was used has been replaced with a two-position 80Hz and 150Hz switch. The manual doesn't make this clear, but in addition to the low pass filter at 80Hz there may also be a filter at 150Hz, or the filter may be bypassed entirely and the EP150 allowed to roll off "naturally" above about 150Hz. In either case, if the 150Hz position is selected there should be a good blend with the M0s and this is no cause for concern.
The roll-off numbers are rather a moot point, but a sealed enclosure rolls off about 12dB/octave below the tuning frequency, and the low pass filters on subs typically roll off at 24dB/octave above the frequency set.
