* Super wide edge surround 1.75" in diameter.
* Flat diaphragm with a total diameter of 12" or 15" - including surround.
* Mounting depth 1.75".
* Required space clearance for forward and backward excursions 3.5" in each direction.

    Earthquake's symmetrically loaded passive radiator - SLAPS is designed to produce maximum bass from a shallow space. As its name indicates, the SLAPS integrates identical components in its suspension. The structure itself is made of a custom designed aluminum ring. the ring carries, on each of its sides, a one-piece flat diaphragm with a super wide edge surround; the diaphragms on both sides are identical in structure, hence perfectly symmetrical resistance to inward and outward movement. The diaphragms are spaced 1" using a weighted solid ring for tuning purpose. The SLAPS-12 excursion exceeds 2.5" in each direction.
   
    Earthquake's symmetrically loaded passive radiator allows the user to tune an enclosure - very low, without having to increase the enclosure volume. The SLAPS can be widely used in car as well as in home audio applications; wherever subwoofers are needed to be tuned at low frequency, without increasing the enclosure volume, and without the need to deal with the traditional shortcomings of port tuning such as: port noise, port length and availability.

Typical passive radiator designs greatly suffer from non-linear forward and backward excursions; its forward movement inhabits different resistance from its reverse movement due to spider limitation, thus making its response inaccurate. Further, a typical passive radiator is built using speaker basket that is 4" to 5" deep, making its application more cumbersome than practical.

Earthquake manufactures products for the car and home audio markets, most of which are geared toward high power applications and bass. In car audio competition circles, SPL is "the name of
the game". Bass freaks scramble to add a dB or two to their audio systems; using the SLAPS is a sure way to achieve the goal. In home audio applications, especially with the advances in Home Theater systems, low bass is a must to complete the circle. The SLAPS can be used to tune subwoofer enclosures to attain the desired results.