@gwng8 The Powercells have the same goal as most every other power conditioner: reduce/eliminate AC-born noise and lower the system’s total noise floor while inducing minimal negative impact on dynamics and tonal characteristics (colorations) of the equipment they feed AC to. The differences in the various brands is how their designs go about doing that and the resulting effectiveness and impact on sound character. SR’s method is to use active electromagnetic cells while completely avoiding dynamically constrictive chokes and conventional passive filters, which AFAIK is unique to them. They claim these EM cells do a much better job of eliminating noise while having much less (no) impact on dynamics than other designs.
The more electromagnetic surface area that the AC signal is exposed to as it passes through the conditioner, the more the reduction in noise. The SX has more EM cells and each cell contains more contact surface area than the UEF SE, the result being a significant increase in total EM surface area, thus delivering a greater positive effect.
I have had each Powercell dating back to the original Powercell 10:and can attest that each new model delivers a much more profound impact than its predecessor. Based on feedback from several friends who have upgraded from the UEF SE to the SX with both using the Galileo SX power cord, the SX is significantly better than the UEF SE. The same goes for their top power cords feeding the Powercells. Each new version significantly outperforms its predecessor and makes a step-function improvement in the performance of the accompanying Powercell.
If you are buying new, the dealer should provide a money back trial. Just make sure to give a new unit two weeks to settle in before judging its merits. They tend to sound constricted straight out of the box and go through up and downs the first few days but improve monumentally over the first two weeks.