Donwloaded a random free pack on sampleradar and picked a crash because this is a realy good example. Very long tail so you can hear clearly the hiss come through in the end. Some samples are less 'hissing' some are good and clean. Same for all the rest.

I was wondering since I have good equipment now (even without my good studio monitors) I hear almost always a background white noise when the hits end. Is it just a matter of quality samples or is it normal and you just have to edit (fade,eq,denoise plugin,noise gate) them because the not so big amount of the standard samples with logic don't have that noise. I have a pack of loopmasters and thought they should be without noise,unfortunately. I think most people don't notice but right now i'm trying to get professional.  For the hats,snares, claps I know there can be noise from the surroundings but with pure electronic kicks??