I decided to place the subs equally right across the room from each other and see how that goes, Im still waiting on a monster cable coaxial audio cables to reach the other side of the room. Will coaxial cables produce better sound than RCA cables??
RCA cables ARE coaxial.
RCA refers to the plugs on the ends - they are "RCA Phono" plugs. RCA was the original manfacturer, and they were originally used with turntables for vinyl records, i.e. "phonographs", hence "phono" in the name. Nowadays they're normally just called RCA plugs or RCA jacks.
https://en.wikipedia.org/wiki/RCA_connector
Coaxial refers to the construction of the cable itself. A coaxial cable has a centre conductor and an outer screen, or shield, made from twisted or matted strands of copper which form a tube, surrounding the inner conductor and shielding it from some kinds of interference. The inner conductor and the shield are both centred on the centre of the conductor, hence they have the same axis, hence "coaxial".
The quality of the cable can be important, especially for long cable runs (where cable capacitance can cause loss of high frequencies) or in electrically hostile environments (where the quality and density of the shield is important), but in your case, there's probably no significant difference between standard and Monster cable, apart from the impact on your wallet!
Monster cables CAN be useful when significant power is present, such as connections from amplifiers to speakers, because they are thick and have low resistance, so they improve efficiency, and (slightly) damping factor, but in your application, all the high-power connections are inside the powered speakers. Generally, claims about audiophile cables are not substantiated by any valid testing.
