

RSS390HO-4 is used on WatSub subwoofer and it has proved it's quality.
Black anodized cone and rubber surround are a long lasting choice as material. The magnet is heavy and the motor of the driver provides force factor of 19,8 Tm. With four ohm nominal impedance the strong motor moves a bit heavier mass also easily.
This driver is optimized for very small enclosures and works also on reflex if you design the port with enough area and length.
Information about availability
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