Yes, VERY bright strings. I just switched out my dead ones for a set.....dreading what was going to happen.....yike. Last nights gig (4 hours after changing them) I was forever adjusting knobs. My treble on my amp was originall at 3 oclock, had to turn it to 10oclock.
In my case, now I have to rethink how I play. They are very sensitive and when doing slap/pop I had massive "wrong string hit" issues. Well......my own fault....
But once I've played on em for a few gigs they'll calm down

If you have a bass that always sounds dull, toss a set of these on there..........you'll never hear dull again!
One great thing about em is they last for a loooooong time.