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
JBL E130 15 inch Speaker SOLD : The Steel Guitar Forum
Vintage JBL E130-8 15" Guitar Piano Organ Speaker 8-ohm 150W/300W Woofer #2798 | eBay