Earthquake SuperNova MKIV-15
Available through Master theater Builders

Steven Stone, September, 2002

Boom. Thud. Crash. What would a movie be without low-frequency effects? Even non-macho films like Sense and Sensibility have their share of carriage-wheel rumblings and horse-hoof thuds. Without a serious subwoofer that extends down to a solid 30Hz, and preferably even lower, a home-theater system can hardly be called "high-end."

http://www.guidetohometheater.com//speakersystems/60/index.html

http://www.earthquakesound.com/subs.htm

-Polyurethane hard shell finish
-One Magma-15 active driver
-One SLAPS-15 passive radiator
-One BA212 - 580 watts digital amp
-Multi-position remote sensor & control
-Dimension: 21 1/2"x17 3/4 x17 1/2"
-Weight: 88 lbs

(Symmetrically loaded Audio Passive System)

SLAPS Technical specifications

* 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.

As its name indicates, the Earthquake SLAPS integrates identical components in its suspension
structure, thus making its forward / backward movement identical -linear. Its symmetry is
further enhanced by the use of flat diaphragms with super wide edge surrounds, making its
excursions in excess of 2.5". The ring structure has a depth of 1.75", thus making
the SLAPS applicable in shallower spaces (enclosures)

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.