Vinyl and slurring S'es

I have been listening to a lot of vinyl for the past for months and have been considering a new turntable. But I have a question. I have noticed that when listening to my vinyl the s'es sound "slurred". I'm not really sure how to put it any other way. This is with new and/or older records. My question is; is it the recording? Do I have something set wrong on my turntable (anit-skating, ect)? Or is it my electronics. I don't notice this when listening to CDs. I have several on CD and vinyl and the CDs are crisp and clear. I have had two tables in my system in the past two weeks and both do it; a Denon 47F and a Basis 1400 w/300 arm. On both tables was a Grado Sonata cartridge. I am using a Black Cube running into a Classe CP60. The amp is a McIntosh MC300 and Thiel 3.6 speakers. I really prefer the sound the vinyl gives but those s'es can really make it fatiguing sometimes. Any insight someone can give on this matter would be appreciated.

Thank!
Tim