I already have the spr17s with crossovers installed as well as the spr-69 c I am now going from using the prmier's deh-600ub 50x 4 peak watts to the actual watts tested on the pdx5 are 110x4 rms and 422x1 on the mono but I am getting another pdx series amp for the 3 x10 type x that I am getting. second amp will arrive in july and will power 2 12 xsites until I get the type x. by the way would you go multi channel or mono for the 3 x 10's?