Technics SB-MX200D

Commentary

This is a floor-type speaker system that uses a mica diaphragm for all units.

A 27 cm cone type woofer is installed in the low range.
A mica composite diaphragm is used for the diaphragm. Mica is mixed with pulp and aramid fiber, and the surface is coated with lacquer to obtain a large specific elastic modulus and internal loss. In addition, due to the large damping of natural vibration, resolution and transparency in the mid and low frequency range are improved.
The voice coil uses high-purity 7N-OFC flat wire with edgewise winding, and its surface is treated with an insulating film by a newly developed resin electrodeposition method to improve the force factor.

The mid-range features a 6 cm dome mid-range.
The diaphragm is made of Pure-Mica with a Urushi-coated coating. In addition, the diaphragm has an elliptical cross section and an over Le Dome shape to expand the upper limit frequencies and enable operation with more leeway.
The voice coil uses pure aluminum flat wire and edgewise winding, and the newly developed joint technology improves the response in the middle and high range.

A 2.5 cm dome type tweeter is installed in the high range.
Pure mica is used for the diaphragm, and in addition to adopting the same elliptical cross-sectional shape as the mid-range, diamond coating is applied to expand the upper limit reproduction frequency to 45 kHz.

High-quality parts are used for the network part.

The 36 mm thick high-density particle board and a separate baffle system are used for the front baffle of the enclosure. By installing slits on the top and bottom of the woofer, propagation of unwanted vibration is suppressed. In addition, by attaching damping material around the mid-range and tweeter, radiation of unwanted sound is greatly reduced.
In addition, cross-bridged construction is adopted for the internal structure, and resonance is dispersed by reinforcing connection in the cross shape, and standing wave is suppressed.

The bass reflex port uses an aerostream port, and by installing round flanges on both sides of the opening, disturbance of sound image localization due to wind noise, etc. is minimized.

In the lower part of the enclosure, a silent base using a damping rubber composite material is adopted, which absorbs unnecessary vibration in the middle and high range without losing energy in the low range, and reduces both vibration from the cabinet and external vibration from the floor.

An oak veneer is used for the exterior finish, and the quality is improved and the sound is controlled by applying a lustrous coating through five painting processes. In addition, a convex pin type is used to suppress the incidental sound caused by cavity resonance and reflection at the net catch of the speaker net.

It adopts a large gold plated OFC terminal for biwiring corresponding to the use of extra-thick cord and 4 mm plug.

Model Rating

Method	3-way, 3-speaker, bass reflex system, floor type, magnetic protection design
Units Used	For low band : 27 cm cone type For Middle Area : 6 cm Dome Type For high-pass : 2.5 cm dome type
Playback frequency band	23 Hz to 45 kHz -16dB
Crossover frequency	450 Hz, 4 kHz
Impedance	4 Ω
Output sound pressure level	88dB/W/m
Allowable input	250W(MUSIC) 125W(DIN)
External dimensions	Width 344x Height 903x Depth 423 mm (w / Net)
Weight	47.0kg