mine = 16 Ω Z , yeah oldschool sound, very vintage ... i was told it were PA speakers
but i too use em on guitar, bass, ... usually just with an old tube ampli
images & sound in following uniform resource locators !
recorded for an italian ragazza
recorded through an old italian microfono
also used it to amplify my electric DIY P90 guitar in the 100-guitar orchestra of Glenn Branca in 2015 in the Philharmonie de Paris