National SB-33
¥ 24,800 (late 1960 s)
Commentary
A 3-way speaker system with level control added to the SB-32.
A 25 cm cone type woofer is installed in the low range.
In this unit, newly developed special fiber is used in the roll edge to improve the low sound reproduction capability.
A 9 cm cone type squaker is mounted in the middle area.
A 5 cm cone type tweeter is installed in the high range.
The enclosure is a closed type using a special integrated structure method, and the fo is low by using abundant sound absorbing material inside.
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Model Rating
| Method | 3-Way, 3-Speaker, Airtight Type, Bookshelf Type |
| Unit | For low band : 25 cm cone type For Medium Range : 9 cm cone type For high-pass : 5 cm cone type |
| Frequency characteristic | 30 Hz to 20 kHz |
| Crossover frequency | 1.3 kHz, 6 kHz |
| Impedance | 8 Ω |
| Allowable input | 40W |
| External dimensions | Width 298x Height 580x Depth 290 mm |
| Weight | 9.1kg |