We have the Smooth Jazz station on nearly everyday at work.
It's a very scooped sound, with a very clean amp, and basses with dual pickups (J bass types galore) for that tight snap.
If you look up any of the modern bands played on the station, you'll see 99.9% use dual pickup basses. You migh find one guy with a P Bass, but hardly ever. No, they're not using flats either, tons of snappy slap & pop that only rounds give. It's about tight control of your playing.