Old and archived. Good luck with them! Here are some informative and relevant links which you might like to try, especially if you’re into building your own horns (good luck): Many of these links go to the Internet Archive Wayback Machine. Expect some links
by David Wright Unlike sealed-box loudspeakers, where behaviour can be modelled accurately within a computer programme, and bass-reflex types, which can be closely approximated, no such treatment is available for horn loading. Indeed, their behaviour has still to be completely analysed, while their interactions
Lowther drivers and horns We had an interesting telephone conversation recently with a gentleman in Hong Kong. Basically, he wanted to know why we had chosen to use the Lowther ‘C’ range (ceramic magnets) drivers in our Virtuosos, rather than the ‘A’ range (Alnico magnets).