After 20 years of guitar, I took up bass a few months ago and love it. Currently, I'm using a Yamaha THR10C lunchbox amp with headphones to practice at home, which is fine for late night practice without disturbing the family. My instructor has a 30 watt bass amp that I also use during weekly lessons and I rarely turn it up past 5. I also play electric guitar in a four-piece band that include two acoustic guitars (through amps), harmonica, bass, and multiple singers -- no drummer. At rehearsal, the bass player uses a passive Jazz bass and an Ampeg BA110, which sounds fine. This past week we performed in a large room with about 75-100 people and I couldn't hear the bass at times. I realized afterward that he was using his home practice amp, a Rumble 25, not the larger practice amp. I've been thinking about getting a dedicated bass amp. Aside from reading posts that often suggest 500 watts of class D or tube amps, and the foregoing experiences, I really have no idea how much power is "enough" or "ideal" for my applications. I'm interested in an amp I can use for practice that will sound good without headphones, rehearsal, and potentially playing out (if I continue to improve enough to carry the bass role). Right now, I don't see us ever having a drummer, but you never know in the future. What do you guys recommend? Is there a basic primer on bass amps that you can direct me to? All of the online store information is non-committal and I can't make heads or tails. Any sage wisdom would be greatly appreciated!