For these or other active monitors to get the best sound you need something like this:
(https://www.scan.co.uk/images/products/2698145-a.jpg)
You can try first with some books below the monitors. And so you estimate the optimal height of the supports
[IMG] http://maty.galeon.com/WP-imagenes/hum/AV-Marantz-SR4500-ifi-iCAN-KEF-Q100-ATL-Hi-Fi-DC-Ripple-Blocker-x4-ME.jpg
I bought some second hand stands and cut them to the required height. I filled them with sand and something like polyurethane putty/sealant to eliminate vibrations and improve the insulation.
Better star quad (geometry) cables to attenuate the RF/EMI interferences. XLR/jack <---> RCA or XLR/jack <--> minijack.
PS: all my hard (first and second system) were cheap tweaked by me and the sound is much better than the original.
PS2: polyurethane putty/sealant -> sticks very hard all kinds of material and ... add mass and elasticity what is necessary to cushion.