Not wanting to help you with your homework too much but...
why not email Charlie
Watkins and ask him? He started the company, his website's here
I only know because
about 12 years ago I bought some excellent bass guitar cabinet designs from him. They
sounded great, I used them for quite a few years. Charlie was very helpful &
knowledgeable, and certainly came up with the goods. At the time I couldn't believe I was
dealing with the legend - this was the same guy responsible for the "copicat" and the PA
systems for classic gigs like Hendrix at Isle of White, and the Stones at Hyde Park. As
far as I know he's still trading...