Richard Allen's double cone type full range unit. It's a deep, narrow range, and it's a sound that sits on your back. The appearance is fine, with no noticeable scratches, etc. (Kobayashi Hitoshi)
Maintenance information: 2024.6.12 Operation confirmed
Accessories: none
Main specifications: 8 ohms playback frequency band 45 to 15,000 Hz output sound pressure level 91 dB baffle aperture diameter 178 mm weight 1.8 kg