can anyone recommend some gadgets such as bass cubes epecentres etc that will help balance my system {yet to be installed} or do i need to install before i know what i,ll need. just seems easier to install all at the same time. my system is as follows focal polykevlar 6.5 comps run of genisis four channel and two focal 27cm polykevlar subs run of genisis dmx monoblock and a pair of 690cv,s polys for rear fill run of two channels of the front four channel.