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Description: The Worlds Largest SPL Competition format for Ultra Low Frequency Car Audio systems

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Welcome to (((pd))) GLOBAL The Worlds Largest SPL Competition Format for Ultra Low Frequency Car Audio Systems

(((pd))) propper droppers is the WORLDS 1st and ORIGINAL, MULTIPLE FREQUENCY SPL competition format for finding out just how LOUD your car audio sound systems can truly play Ultra Low Frequency BASS. Our SPL testing frequencies start at 40Hz and drop to 20Hz.

Links to propperdroppers.com (2)

• propperdroppers.co.uk SPL Testing @ Ultra Low Frequencies - propper droppers
• devilracing.co.uk SPL Testing @ Ultra Low Frequencies - propper droppers