Third set I've had on my Warwick RBS 5; it's passive, and from the original strings, to D'addario Prosteel XLs (very nice, beautiful) to these, I've found more and more volume. These Boomers kick out a hefty output even through passive pickups/elecs, and the tone is clear when played at the bridge, solid and convincing on the B string, and... ballsy, even. Still sing prettily when I tweak my playing/tone etc. Feel smooth, seem well constructed; will follow up in a few months. Highly recommend, so far.