K100s are awesome speakers, but I wouldn't say they're smooth. They have a throaty growl and a fair bit of lows and mids, just not in the upper mid way v30s do.
I have some paired with Jensen Tornado Stealth 80s and they sound massive together.
Creambacks are relatively smooth sounding, same...
Kolaches are czech. A lot of Czechs settled in texas and the midwest. Shiner was started by a czech family iirc.
They're all over the place up here in small town MN/WI but not nearly as ubiquitous as they are down in TX.
ain't no whataburgers up here selling them lol