已经搭载在许多高性能机型中的DD直驱系统，与普通的皮带驱动相比它需要更多的空间，而且自动翻转功能一直很难实现。DD9利用两个独立的主导轮DD直驱机构实现了双向自动翻转功能。此外采用了石英锁定主导轴伺服马达控制两个绞盘的旋转，保证了磁带运行的稳定性，并且达到了双向翻转机中最低的0.07%抖晃率。另外，还使用了双波浪型精细间隙EX非晶质磁头，配备镀金 端口的高音质MDR-E575耳机和具有高指标的钽电容器等，外壳采用了最大厚度2毫米的坚固铝合金机身。
新品发行价：4万3000日元/机身尺寸77.7109.2×33.1毫米/重量330克/电源： 口香糖电池或5号电池×1节/续航时间2.5小时(使用口香糖充电电池)
充电电池重低音 金属带
DOLBY B/C
1990 SONY wm-dd9 has the function of automatic turnover and realizes the shaking rate of 0.07%
The DD direct-drive system, which is already built into many high-performance models, requires more space than a regular belt drive, and the auto-flip feature has been difficult to implement. DD9 USES two independent steering wheel DD direct drive mechanism to realize two-way automatic rollovers. In addition, the servo motor of the quartz lock main shaft is used to control the rotation of the two winches, which ensures the stability of the tape operation and achieves the lowest shaking rate of 0.07% in the two-way turning machine. In addition, a double wavy fine-clearance EX amorphous magnetic head, a high quality mdr-e575 headset with a gold-plated port, and a tantalum capacitor with a high index are used. The case is made of a sturdy aluminum alloy body with a maximum thickness of 2 mm.
Launch price of the new product: 43,000 yen/body size: 77.7109.2×33.1 mm/weight: 330 grams/power supply: gum battery or no.5 battery ×1 / battery life: 2.5 hours (using a gum rechargeable battery)
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