Very nice system indeed.
I agree with Aigenga about having 3 metal (the harder, the better) cone spikes between the top speakers and the bass modules (it improves the highs and high-mid dynamics and focus)
Another easy and no-cost upgrade would be to twist each positive and negative "pair" of wires instead of having them hanging individually (and separated from each other).
One note about power conditioners: most so called "line conditioners" because of their "toy" nature actually end up limiting the dynamics of power amps and some of them even "pollute" the audio system power ground by "coupling" the noise from the live and the neutral lines to ground.
Serious, professional power conditioners that actually work, don't limit amp dynamics, greatly improve soundstage while giving the "darkest blacks" while not being very expensive must be sized for the whole room/system.
I highly recommend to try the Sola/Heavy-Duty MCR Hardwired Series: http://www.solahevidutysales.com/pdf/powerconditioners/mcr.pdf
The only drawback of these MCR (and all ferro-resonant) power conditioners is that due to their physical design, the units produce some audible noise. However as these must be connected to the facility/home Main Power panel, as long as such panel is not co-located with the sound system, the noise should not be a problem.
Disclaimer: not affiliated with Sola/Heavy-Duty, just a very happy owner of one of their units.
