National SB-30
¥ 21,000 (1 unit, around the late 1960 s?)
Commentary
A speaker system marketed under the National brand.
There is a model with the same model number in the Technics era, but the content is a different configuration.
It is equipped with a 20 cmMFB woofer for the low band developed exclusively for the MFB system, a 9 cm cone type squaker for the middle band, and a horn type tweeter for the high band.
The enclosure is hermetically sealed.
Model Rating
| Method | 3-Way, 3-Speaker, Airtight Type, Bookshelf Type |
| Units Used | Low Band : 20 cmMFB Woofer (8P-ZIS) For Middle Range : 9 cm Cone Type (MP-31SA) For High Range : 5 cm Horn Type (HT-23SA) |
| Playback frequency band | 30 Hz to 25 kHz ± 5 dB |
| Crossover frequency | 1.5 kHz, 5 kHz |
| External dimensions | Width 295x Height 500x Depth 141 mm |
| Weight | 6.3kg |