Meeting the requirements for Enhanced Acoustical Performance is a step up from the prerequisite. For the credit, project teams are required to have a Background Noise Level of 40dBA, whereas the prerequisite only requires 45dBA. The credit also requires project teams to meet Sound Transmission Class ratings as outlined in ANSI S12.60-2002 whereas the prerequisite does not require projects to meet any STC rating.
Do you know which LEED credits have the most LEED Interpretations and addenda, and which have none? The Missing Manual does. Check here first to see where you need to update yourself, and share the link with your team.