It's cheap because it's in poor condition. A high-efficiency driver unit adopted in the A7-500, etc. Further broadband playback is possible by combining it with the 511B sectoral horn. One terminal on one side has been replaced (Kanai Hidetsugu)
Maintenance information: 2022.4.28 sound confirmed
Accessories: None
Main specifications: Alnico 8Ω Allowable input 50W 105dB Frequency characteristic 500Hz to 20kHz W114 × H114 × D94 mm 3.0 kg