Every company has an evolution... And as many know...Infinity was the hi end in the 70s/80s with their Emit technology....in the later part of the 80s they dumbed down their RS series...and started using the very fatiguing, polarizing Polycell tweeter...things eventually improved with the advent of their CMMD drivers, computer analysis, and the deep.pockets of HI...which is why I don't find the stellar reviews of Primus products so surprising...their Sister company happens to be Revel.