Home / Line 1 / Ro-Tap with Sound Enclosure and Stand. Meets ARM 2.5 and ASTM D1921 Standards. Ro-Tap with Sound Enclosure and Stand. Meets ARM 2.5 and ASTM D1921 Standards. Sound Enclosure and Stand The sound enclosure and aluminum stand are manufactured by W. S. Tyler. Operating noise levels are reduced from 85 decibels to 60 decibels. The enclosure also protects and keeps the equipment clean between uses. This sound enclosure is a highly reccommended option. The aluminum stand may be used with or without the sound enclosure.