Yep , i know about the difference of the lf and non-lf versions and about the mid drivers of the fEARfuls. The guy with the space , who is the guitarist in my current band and longtime friend has an electronics degree so he will be helping with crossovers and wiring plus my father works with wood and got loads of spare to contribute . The main point is the cost of the drivers in each situation ( 3015/3015lf + middriver or 2x3015 would be ideal moneywise) . Also , are those fEAfuls that hi-fi?
If you like what you put in, you will like what you get out. A 15/6 has the potential to match a pair of 3015's if you have enough amp.