My first amp was a tube Wurlitzer juke box amp I rebuilt into a big cabinet my dad built. It had a 15" field coil speaker (which had an electromagnet wired as a choke in the power supply of the amp.) I added a 12" speaker to it in that cabinet. My first real bass amp was a 50 watt Bassman with a 2X12 cabinet, which was a miserable bass amp, only loud enough in my bedroom...never loud enough with any band. (1967) In 1975 I got my first "decent" bass amp...a 100 watt Gibson/Norlin SG. Finally loud enough, but soon replaced with a Carvin head and 2X15 folded horn cabinet and that head was soon replaced with an SVT. No more volume problems, ever. I used the SVT with the folded horn and a 2X15 EV SRO West cabinet. No PA support needed, not that there ever was in the 70's.