trying to put an install together need advice on head units audio control eqs and which way to wire it all up and whether too use the six by nines for rear fill or just leave them out ? should i use my alpine cda-7873r with a audio control eqs or buy a newer headunit with 4v preouts ? also running a genesis four channel amp do i use this just for power the fronts focal k2 power 165 k2p or focal six by nines for rear fill? and a genesis dual mono running two focal k2 27kx subs do i wire these in series or parrallel ? can any one help? cheers