JBL professional tweeter. Since it is designed to send sound far away, it has a solid and straighter sound quality compared to the company's consumer model 077. The mid to high frequencies are vivid, and the low frequencies are finished with a tight sound. The appearance is dull and oxidation is noticeable. Serial 80932/79244 (Yoichi Murakoshi)
Maintenance information: 2022.11.25 sound output confirmed
Accessories: none
Main specifications: Horn type tweeter impedance 16 Ω playback frequency band 6,500 to 21,500 Hz crossover 7 kHz efficiency 105 dB W100 × D84 mm 3 kg/book