I'm trying to dive more into synths and other styles, and I'm looking for a type of hit sound similar to these examples:

I'm aware that FL Studio comes with a few hits already, but when I'm going down to low notes, or really high ones, since it's just one sample .wav, it really distorts the quality of the sound, so I'm just seeing if anyone might know of any free or commercial VSTs that would contain some good hit sounds.