Adult science magazine separate volume, whole handmade speaker book, appendix only. Instructions are missing. 7cm full range speaker handmade unit made by Fostex. The unit itself can be made by hand. (MIURA Kimiya)
Accessories: original box
Main specifications: 7 cm full range impedance 8 ohms efficiency 85 dB playback frequency band F0 to 30 kHz rated input 6 W