I want to build a portable amplifier for a musical instruments used indoors and
outside for incest (or morris dancing). As far as I can find, commercial ones
are rather expensive and wouldn't stand the odd shower of rain.

I've come across a couple of 40watt Pioneer 3 cones speakers and a "booster"
amplifier (2 * 100w, might be a bit dodgy if I'm not careful with the levels).
The amp actually has a couple of 600mv inputs so until it's working I shan't
bother with a preamp.

The question, really, is how to box the speakers. All I can find by Googling
seems to be hi-fi, large-ish adn not designed for out use.

I was thinking of shelf type chipboard (it seems rigid and comes foc from the
garage) as MDF is rather too heavy. The odd thing about most of the guitar
amplifiers I've seen are open backed, but most but not all of the bass
amplifiers are closed! I don't want a big box I have to carry it, the
instruments and the battery! The speakers are only 5" in diameter, so how small
a box can I get away with? Do I fill it with furry stuff? Do I stick a hole or
even a "port" in it?

Any help gratefully received!

Sam

--
601