Yes. First, this particular B string is such a large diameter that it isn't that bright to begin with on a standard 34 inch top load scale; second, it is especially so after it has settled in a couple of months; and third, so it doesn't rattle as I'm playing funk and up and down the neck, a small piece of foam rolled up just under the B string. Yes, it coordinates very well.
A couple of gigs ago, after over 2 1/2 years, my Fender 9050 .105 flat E string finally and completely died. Thump. Nothing. Crap at sound check, our experienced sound guy of many years even commented. So I dug out a "dead" .105 GHS SuperSteel, so for this gig my bass had a GHS SuperSteel .138 B string, a "dead" .105 Super Steel E string, and Fender 9050 Flats in 80-60-45 for the ADG. It was one of our best gigs ever. Nobody could tell there was any problem, and there was no apparent tonal variation out front.
Mixing strings? Think about it: guitar players have always done it since the invention of steel strings, and pianos have both solid steel trebles and copper wound basses. It's all in the technique for players and how the hammers are adjusted in pianos. It does work. Go peruse the threads on the DB side of the forum to see much more extensive mixing-and-matching. My own DB has a Spiro E string, Bel Canto A & D, and, yes, a D'Addario Prelude G string, and sounds great for a plywood CCB.
