Technics SB-MX5
¥ 49,800 (1 unit, around 1986)
Commentary
A three way speaker system that uses TMD (Technics, Monocoque, Diaphragm).
TMD (Technics Monocoque Diagram) is used for the diaphragm structure of low and middle range.
The TMD was designed by repeating several hundred simulations and prototypes using computer vibration analysis developed by NASA. In this structure, the cone part and center cap part, which were separate pieces in the conventional cone type, are integrated. In addition, by adopting a unique shape selected from computer simulation, the rigidity is dramatically improved. As a result, coupled with the joint drive by the coupling cone, the piston motion range is expanded to twice that of the conventional cone type.
A 27 cm cone type woofer with TMD is installed in the low range.
The vibration plate of this unit has a two layer structure consisting of pure cross carbon and carbon sheet, and realizes weight reduction, high rigidity, and high internal loss. A large strontium ferrite magnet is used for the magnetic circuit, and an aluminum die-cast frame is used to support the magnetic circuit.
The mid-range uses a 10 cm cone type mid-range with TMD.
A 2.8 cm flat tweeter is installed in the high range.
The diaphragm is made of pure mica, a natural material with approximately three times the bending rigidity of aluminum, and achieves high-sound reproduction without the inherent squeal that occurs with metal diaphragms such as beryllium and titanium.
The network section uses the traditional Technics linear phase network.
In addition, the use of a large electrolytic capacitor for sound has improved sound quality in the low and middle range. In addition, the LC-OFC is wired straight without using a print pattern, and a non-magnetic material is used for the choke coil fastening screw to prevent deterioration of sound quality.
In order to suppress the adverse effect of crosstalk, the choke coil is divided into two parts to prevent mutual interference between choke coils.
The enclosure is reinforced by using the new MCD joint method, which was developed with attention to the Japanese ancient ant-shaped embedded dense image, and the dynamic balanced enclosure in which baffle plate and side plate are always pressed together has been completed.
Model Rating
| Method | 3-Way, 3-Speaker, Airtight Type, Bookshelf Type |
| Units Used | For low band : 27 cm cone type For Medium Range : 10 cm Cone Type For High Frequency : 2.8 cm Flat Type |
| Playback frequency band | 33 Hz to 48 kHz -16dB 42 hz to 40 khz -10dB |
| Crossover frequency | 450 Hz, 3.5 kHz |
| Impedance | 6 Ω |
| Output sound pressure level | 91dB/W/m |
| Allowable input | 200W(MUSIC) 100W(DIN) |
| External dimensions | Width 330x Height 574x Depth 330 mm |
| Weight | 16.5kg |