National SB-25

Commentary

A floor type sealed speaker system.

A 20 cm cone type woofer developed for small cabinets is mounted in the low range.
The magnetic circuit uses a yoke with excellent magnetic permeability to achieve low-frequency reproduction with excellent damping effect. The cone paper uses a material with high Young's modulus to reduce distortion.

A 8 cm cone type tweeter is installed in the high range.
By adopting a strong magnet, a magnetic flux density of 12,000 gauss is obtained.

The enclosure has a completely sealed design to prevent air leakage and a large amount of sound absorbing material to enhance the damping effect.

The exterior is designed with walnut real wood, and the front uses a calm color net and metal sash.
Also, there seems to have been a first term model and a second term model with slightly different logo positions.

Model Rating

Method	2-Way, 2-Speaker, Sealed Type, Floor Type
Units Used	For low band : 20 cm cone type For high pass : 8 cm cone type
Playback frequency band	30 Hz to 20 kHz
Impedance	8 Ω
Output sound pressure level	100dB(1kHz)
Max Input	15W
Crossover frequency	5kHz
External dimensions	Width 388x Height 670x Depth 230 mm
Weight	10kg