Technics SB-M300M2
¥ 70,000 (a set of two cars, around 1999)
Commentary
A bookshelf speaker system that uses the DDD method.
Dual Dynamic Drive (DDD) is used for the lower range.
In this system, two sets of Kelton type woofers consisting of a 14 cm drive speaker unit and an 18 cm square passive radiator are driven in phase with each other facing away from each other. As a result, the vibration area equivalent to that of a 25 cm woofer is secured, cabinet vibration in the low frequency range is greatly reduced, and accurate low frequency characteristics and excellent sound image localization are realized.
14 cm cone type mid-range is mounted in the mid-range.
The diaphragm is a mica-composite ingrained cone diaphragm with 40% by weight of carefully selected micas. The damper uses a dynamic linear suspension to improve linearity in the low frequency range.
A 2.5 cm dome type tweeter is installed in the high range.
This unit uses an original pure mica diaphragm and a new equalizer design to ensure a high frequency playback response of up to 70 kHz (-16dB).
A separate cabinet is used for the enclosure to prevent mutual interference due to unnecessary vibration, and a 30 mm thick MDF is used for the baffle plate attached to the medium and high range unit to ensure rigidity and to prevent unnecessary resonance due to hair transplantation.
In addition, a convex pin type is adopted for the net catch to reduce incidental sound caused by cavity resonance and reflection.
It uses a gold plated speaker terminal for bi-wiring that can be connected to extra-thick cords and 4 mm plugs.
Model Rating
| Method | 3-way, 4-speaker, DDD System, Bookshelf Type, Anti-magnetic Design |
| Units Used | For low band : 14 cm cone x2 For Medium Range : 14 cm Cone Type For High Range : 2.5 cm Pure Mica Dome Type Passive radiator : 2 x 18 cm flat |
| Playback frequency band | 40 hz to 70 khz -16dB |
| Crossover frequency | 160 Hz, 2.5 kHz |
| Impedance | 6 Ω |
| Output sound pressure level | 85dB/W/m |
| Allowable input | 140W(music) 70W(DIN) |
| External dimensions | Width 214x Height 386x Depth 335 mm (w / Net) |
| Weight | 10.0kg |
| Attachment | Speaker cord |