There are 2 lines :
if (count) summa /= count;
srvoPosn[y] -= summa;
If you are not going to use servo, than you need to change type of srvoPosn[] to "float", and remove code "if / else" statement that follows. Than
srvoPosn[y] = asin ( koeff * summa / 2048.0) * 180.0 / PI;
I'm not ready to give a coefficient "koeff" , sure it's would be proportional to distance between mic's - base, you have to find out from practice. asin defined in -1 : +1.
http://www.cplusplus.com/reference/cmath/asin/