Technics SB-M20

Commentary

A two way speaker system that uses a mica diaphragm.

A 14 cm cone type woofer is installed in the low range.
The vibration plate of this unit is made of composite mica. The main component is mica, which is a vibration plate material with light weight, high rigidity and high internal loss. By mixing natural pulp and self-adhesive novolac fiber, the high frequency reproduction limit is expanded and the piston motion band is expanded.
The voice coil uses a linear magnetic circuit that uses a short voice coil to achieve crisp low-frequency playback.

A 2.5 cm dome type tweeter is installed in the high range.
The diaphragm is made of pure mica, a natural material that has approximately three times the bending rigidity of aluminum. It is finely divided and heat-cured to achieve a higher specific elastic modulus and internal loss than titanium. This improves the sound connection with the woofer while achieving a wide range. In addition, since there is no inherent noise like meta Le Dome, low-frequency distortion is suppressed.

The enclosure uses a bass reflex system.
The bass reflex port uses an aerostream port that suppresses wind noise.

Uses an input terminal to which thick cables and 4 mm plugs can be connected.

Model Rating

Method	2-way, 2-speaker, bass reflex system, bookshelf type, magnetic protection design
Units Used	For low band : 14 cm cone type For high-pass : 2.5 cm dome type
Playback frequency band	55 Hz to 45 kHz -16dB 61 hz to 38 khz -10dB
Impedance	6 Ω
Output sound pressure level	87dB/W/m
Allowable input	80W(music) 40W(DIN)
Crossover frequency	2.5kHz
External dimensions	Width 202x Height 324x Depth 247 mm (w / Net)
Weight	6.1kg
Attachment	Speaker cord