I got this from an article on CBSSports.com. My math is in bold.
The biggest payday in MAC history, works out this way:
-- $7 million of the $28.2 million is divided between the five non-BCS conferences (Conference USA, Mountain West, MAC, Sun Belt and WAC). $1.4M for the MAC
-- Another $7 million is divided into 15 “units” based on conference strength. Because it is the No. 1 ranked non-BCS league, the MAC will receive five of those 15 shares, followed by the No. 2-ranked conference getting four shares, etc. $2.3M for the MAC
-- The MAC will get $8 million of the remaining $14 million as the participating conference. $8M for the MAC
-- The other $6 million will be split up into those 15 units. $2M for the MAC
So that adds up to $13.7M for the MAC. I would guess the MAC would give half of the $8M to NIU leaving $9.7M for the rest of the MAC. Since the MAC would normally get $3-3.5M, looks like an incremental $6-6.5M would go to the other 11 MAC schools to divide.