The MARRS (Monitoring and Acting on Remote Real-Time Student Performance) project aimed to explore the impact of using a Comprehensive Assessment and Data System (CADS) in schools.

This data suggests that an increased use of sound field amplification equipment would result in substantial annual savings for school districts in substitute teacher pay.

50% of teachers will experience a vocal disorder at some point in their career. An estimated 2.5 billion is lost to sick leave for vocal related issues. Teachers surveyed rated classroom audio systems one of their most useful teaching technologies with as much as 60% fewer days sick days from vocal strain when using classroom audio.