Sometimes it's eq more than volume. Trace Elliot gear with than horrible, inherent smily face eq may sound nice on its own, but soon gets lost in a band situation.
I did 30 or so jazz gigs with a tiny Phil Jones 75 watt combo. Admittedly not huge venues, but still typical of most gigs that guys on here do, art galleries, marquees and pubs. I never had a problem with being heard, possibly because of its ultra clean sound ?