SOUNDPROOFING FOAM SHEETS 10-30 DB – This foam sheet handles frequencies from 10-35 DB. This sheet is a “Yachtsman’s Deluxe”, a composite material with good absorbing and sound barrier characteristics. It is recommended for the low to mid frequency ranges usually associated with diesel engines. Sheets are 32″ X 54″ and 1/2″ thick. Sold by the sheet.