Using a center speaker as only surround speaker?


I would like to know how detrimental it would be to my HT listening experience if I placed a Sonus Faber Piccolo (bi-wireable) center as my only surround speaker. The other bad news is that it would go on the middle back wall above my couch.

Reason for this madness - I want to timbre match my Sonus faber fronts (Concertinos-L&R and Piccolo Solo- C) I cannot get my hands on the "Wall" model and cannot afford a pair 2nd pair of Concertinos at this time.

I am sure there are a hundred problem areas, but any input would be deeply appreciated.
marc1006
I doubt that you will be able to select just one rear speaker, probably a pair or none, therefore you could use this device,

http://www.mcmelectronics.com/product/AUDIOPLEX-TECHNOLOGY-MONOMIXER-200B-/50-6693

to send both L & R into a single speaker. Also, you have the right idea to direct the speaker toward the ceiling. This should give you a better effect than facing forward.
IME of setting up hundreds of surround systems where the couch is against the back wall it is very difficult to render the rear channel properly. The compromise that I found best was to pull the couch out from the wall just enough to put the rears on there back on the floor pointing straight up.
Ok - I will do some experimenting. I think flat on the back on the floor is going to be my first test.

I am pretty sure I can select just one speaker for the rears - I am using an old pioneer elite vsx-29tx, but thanks for letting me know in case I am wrong.