Yamaha NS-250E 'Ear' Speakers
A rare, vintage, open-baffle design from Yamaha. Though to date from around 1970. We found the specs below, but information on these is hard to fine. Please let us know if you have any more.
Model: NS 250E
Impedance: 8 0hm
periodic resonance: 40 cycles per second.
Frequency range: 40-18000Hz,
assembly: 38x51 cm woofer, 6 cm tweeter
More pictures after the break.