Seismic Bass Quake 2008 ITV Coverage
The largest seismic earthquake caused by car stereos was caused by 22 cars which made the ground vibrate with a velocity of 6.325 mm/s. The event was organized by Fast Car Magazine and www.talkaudio.co.uk (all UK) at the Santa Pod Raceway, Northampton, UK, on 22 October 2008.
In a scene of multiple car audio competition formats, where Sound Pressure Levels reach 180dB and physics-laboratory-calibrated microphones and sensors are used, there has never been a truly rigorous scientific way of comparing one organisation's World Records with another's. Also, they have many categories.
So, whilst it might seem logical and realistic to have "The World's Loudest Car Stereo" records in the fabled Guinness book, it has never happened. Guinness World RecordsTM' reputation for scientific veracity is absolutely unassailable, so getting a record ratified needs some pretty stringent recording and independent witnessing.