The International SPL League (ISPLL) was founded in 2013. The primary purpose of the league is to build a family-friendly community around serious competition. We also strive to bring a balance to the multiple types of metering protocols in each sound competition organization; eliminating the advantages of certain vehicles and displaying a more realistic SPL score.

There are four divisions of ISPLL: Pro Audio (New in 2023), Real SPL (Peak Score), All Around SPL (Musical Average), and Subsonic Suicide (Low Frequency Musical Average). These divisions are explained further in the rule pages or our rulebook HERE. Each division has multiple classes.