Morrison speaker question


Does anyone know why this speaker had 5 plugs rather than 2 or 4?

 

https://www.canuckaudiomart.com/details/649555190-morrison-18-omnidirectional-speakers/

charliebrownchristmas

Showing 1 response by roxy54

Those are amazing speakers at a great price!    I'd be tempted if I hadn't just bought speakers..