I was able to confirm the sound output. There is a gap in the attenuator. Details are unknown, unmaintained, and sold as junk. The shape (replacement) of the ATT knob and the color of the cable are different on the left and right. Please use it as a parts remover. *Member prices are not applicable for junk items (Murakoshi Yoichi)
Maintenance information: 2026.5.27 sound output confirmed (attenuator galley, unserviced. (It will be handed over as is for junk items)
Accessories: none
Key Specifications: 16 ohm crossover 2,500 Hz