I just put a set of D'Addario Half Wounds on my jazz bass, and I have to say, these are the strangest strings I've ever played. I was hoping that they'd be not quite as bright as roundwounds (which is what's implied on the D'Addario website), have less string noise, and be smoother feeling. They actually sound more like really dead flatwounds than roundwounds (they have a good thump, and the high end is really rolled off). The feel is really odd. I doubted the comments that said they're sticky feeling, but sure enough, they are. If you were to slide between frets, once your finger gets moving, they're smooth, but it takes more force to get your finger started, which can affect your timing if you're not used to it. Despite all these comments, they really are great sounding strings, especially if you want a motowny sound. But I won't be keeping them on the bass — they're not versatile enough. If I had an extra bass laying around, I'd put them on that, but they're really kind of a one trick pony.
Here are some audio clips of the same bass with two sets of strings (Fender Jazz with Dimarzio Area J pickups, neck pickup on full, and bridge pickup rolled back a hair so the midrange isn't scooped out). First are Fender nickel roundwounds. These are really great strings. They feel nice, and aren't too bright. The second is the halfwounds. Both tracks were recorded with no EQ.
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