38cm (15") Subwoofer.
Features of the JBL GT415 include:
- Polypropylene woofer cone delivers exceptional attack resulting in incredibly tight bass response.
- Butyl rubber surrounds offer ideal cone-edge suspension and also guarantee long-term reliability by rejecting moisture and ultraviolet contamination.
- 12mm Linear one-way X-max and dual 40oz(80oz)magnets make this subwoofer a great choice for high output applications.
- Progressive spider provides better control at excursion limits than more commonly used linear spiders.