Description: SPL Testing at Ultra Low Frequencies
bass (2755) competition (1853) propper (15) low frequency (9) droppers (8)
(((pd))) propper droppers is the WORLDS 1st and ORIGINAL, MULTIPLE FREQUENCY SPL testing format for finding out just how LOUD your car audio sound systems can truly play Ultra Low Frequency BASS.
By Ultra Low, we mean those thunderously low bass frequencies that will shake and vibrate the very ground that you are standing on, the surrounding air that you are breathing in.
Frequencies that are so low and played so loud, that you can hear and feel the effects from vehicles that are streets away.… well before you even see the source of the air shifting, ground pounding, street bassing sound machine.