Speaker efficiency is often more important than wattage when it comes to volume. Hence 4X12 cabinets, etc., paired with a 40 or 60 watt amp. The math given is correct, but you rarely go from a 3W amp to a 30 or 60W amp with the same speaker  Given your situation I would rent or borrow a small PA. They are designed for sound reinforcement, which is what you need here, after all. Mic the amp or go straight to the PA.
__________________
Brian Evans
Around 15 archtops, electrics, resonators, a lap steel, a uke, a mandolin, some I made, some I bought, some kinda showed up and wouldn't leave. Tatamagouche Nova Scotia.
|