[Premium-Rx] Watkins Johnson rack speaker

[libbysales]

Readers:  at Belton I picked up a Watkins Johnson  rack panel 120/240 Vac powered, 8 'channel' audio input, with selector switch vol control nice wide oval speaker..  anyone have any inst book and do we know what sort of impedance these inputs are,  the inputs are BNC connectors that I find odd for Audio..  so I have just cleaned it up a bit and thought I would ask the greater knowledge pool before actual inputting anything ..  

regards:  mac/mc  w5mc