Studio-E - Vintage JBL K130 & K140. The 130 was amazing for guitar and the 140 amazing for bass! Not sure new technology has yet captured their glory. Both now available as
Can't Separate JBL Speaker from Baffle Board | Fender Stratocaster Guitar Forum
JBL K130 Specifications
JBL K130 15" AlNiCo Extended Range Musical Instrument Loudspeaker - pair | Stereo, Home Cinema, Headphones Components
JBL K130 guitar speaker | eBay
JBL K130 guitar speaker | eBay
JBL K130 15" Alnico Magnet Speaker | Reverb
15" JBL K130 Loud Speaker/Woofer/Sub $75 for Sale in Pasadena, CA - OfferUp