I must agree holeheartedly with "Roypan",about attempting to mate a sub with a world class design like the Mini.The Mini,Imo,is simply way too fast for any sub.
I had a Rel Stentor with a sealed high end Avalon design.It was obviously "no Mini"(not much is)but in all honesty I could never get the combo to match seamlessly.I got a very close match,but if I were to do it again,I'd definitely run solo.No sub needed with the Mini,especially if the room is not very large.
I believe(and have seen this very often) that whenever one gets a sub bass system,they go a bit "woof crazy",and are compelled to "think" the sudden abundance of bass is more accurate,when in reality it is slower and more plodding.....This is a common thing,and just human nature,so one is not to blame here...but...
usually the sub eventually gets sold down the road,and a more full range design is called for.
We all go through this,from time to time.In any event,the Mini goes down "damn deep" if set up and driven "well",but that is another issue altogether.