Two 4000 watt QSC power amps driving two JBL SRX728 subs kind of negate the need for a powerful personal bass rig to "carry the room" and the rhythm section benefits as well, thus the whole band does...even when we aren't very loud. Best bass rig I ever bought. Certainly "carries" any room.Allows me to use only a 210 onstage for most gigs and two 210's for outdoor larger gigs. Drummer gets to use it too.
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This can be entirely true, unless the bass isn't in the mains enough to be heard on stage. Or if, to pull an example from my recent experience, let's say that your lead singer/guitar player is running about 4000W of monitors. For himself. No, I'm not making this up. And so all you can hear on stage is a load of guitar, and vocals. This is where suddenly my happy little Bergantino 322 starts to complain that while it may be rated at 800W it really isn't rated at 1500, and threatens to become unhappy. (And all the time he's saying "I can't hear the bass over here, turn up!")
So, OK, so a 322 isn't exactly a small or light speaker (at 93 pounds) but that's the point. That's for small gigs without PA support. With PA support, I find that sometimes I need a lot *more*. Those high-powered stage monitors don't seem to do well below 100Hz, but they do great around 5K and I do have to compete with that.
It's about control. You take way more than you need and then you exercise self control. (Or not, sometimes.)
Personally, I actually miss the days when we'd take a couple of monitors on stands for the vocals and call it good. We played much quieter in those days. I used to run 50W and I could hear myself and everything. *sigh*
(Correction: much quieter, except for guitar players. What is it with guitar players anyway?)