JBL K Series Musical Instrument Loudspeakers
A new generation of powerful musical instrument loudspeakers with the unmistakable sound quality and high efficiency that have become a virtual JBL trademark since the famous F Series was
introduced a decade ago.
Link to PDF: JBL K Series Musical Instrument Loudspeakers (c1978)
https://aboutprosound.com/wp-content/uploads/2022/10/JBL-K-Series1971.pdf
