Used In: Electro-Voice 37, 37D, 38, 38D, 47, 47D, 72, 72D. – Electro-Voice: 37, 37D, 38, 38D, 47, 47D, 72, 72D. and Radii.0007 SYNTHETIC SAPPHIRE. Cross-reference information is provided as a compatibility guide and may not include every application.