Anyone have Bookshelf speakers mounted over top of their subs??

It seems logical to me, but I am a bit of an audiophile novice and this is my first real setup. I'm glad someone has gotten good results,  I cant see much of a difference between this and if I had tower/floor speakers, other than the subs will get much lower end response than any tower/floor speakers I could afford. 

I do not disagree,  I have a room treatment ordered, and I am going to build some bass traps myself, or GIK is a local business to me, so I can pick some up there. Right now the one sub I have is sitting midwall and my room is not ideal, so there are some nulls and some boominess. Hopefully the treatments and traps will control the boominess.im not sure how they affect the nulls though.

I have the sub set at 80hz so directionality isn't too much of my concern, it's more of filling in the nulls, and having better overall sound. I may try facing the 2nd sub directly at the 1st sub on the opposite wall. My room is 11x19 (sub on the 19 foot wall) but there is a stairwell, and a 5 foot entryway to the kitchen,  so sound waves are escaping like a death row inmate. Plus i have wooden sub floors. Not a great scenario, but it's what I'm working with. 

Thank you all for your Input, it looks like my next step is going to definitely be build some bass traps. I have the material to build some 3" thick ones and I am only able to build them about 3' tall due to other things in my living Room that cannot be moved .  I plan on ordering some fabric from Gulliford of Maine to wrap my bass traps in , I think it is probably wise to let my girlfriend to use the color . She has agreed to let me hang acoustic panels on the walls, as long as they are art panels, like the ones offered by Audimute( one of those already ordered) 
Erik, I am not up to speed on my octaves and curves yet , and I am pretty much a novice at home audio. I am very anxious to learn all of the required terminology and technical ability to make what I have sound as good as it can. 

@auxinput,  I have already purchased batts of Roxul,  and some 1x3 select pine for the framing. Going to give that a go. 
Also, please excuse my ignorance here, but what does EQ stand for in this context . My thoughts are Equalizer, and Equipment, but I don't think I'm right. I have a lot to learn.

I was going to put a very thin cloth layer on the back side just to make a barrier between the insulation and my sheet rock walls . I do not know the correct term for it but I'm pretty sure the fabric store will have something along those lines