JBL D50SMS7 Energized Studio Monitor System (1967)
Designed to meet the need for a compact professional monitor capable of reproducing the full frequency and dynamic range of master recordings.
Link for PDF: JBL D50SMS7 Energized Studio Monitor System (1967)
https://aboutprosound.com/wp-content/uploads/2022/09/JBL-D50SMS7-1967-1.pdf