This is a replacement sound system for a school multipurpose room. There is a stage at one end and a moveable wall to split the room. The opposite end is sometimes a meeting room with its own mic and A/V. Here’s the floor plan of the room, divider and a stage mic input in a floor pocket. The new system eliminates long mic cables and is easier to operate.
All of the DSP required for distributed speakers, source tone controls, room equalization, principal paging and ducking, speaker protection and Level control is included in the HAL3s. Each of the two outputs has a limiter to protect the speaker, and each zone is preset with a maximum loudness.
The Blu-ray player audio is wired to the Line-Plus inputs on the HAL3s, which mono sum the left and right signals. The RAD2 also mono-sums its RCA inputs.
The annoucement feed from the Principal's office automatically ducks any room audio, allowing the page to be heard, with regular volume resuming in a few seconds after the page is over. It will not matter where room remote volumes are set within each room, so a page will always be heard. Voice Detect is used to trigger the page, so a separate switch does not need to be wired from the office.
This configuration uses Halogen’s Room Combine block. It allows you to think about the sound in one room at a time, rather than having to think about how all the other rooms and remotes behave with each wall change. Paging from the Principal is easily handled within the block.
DR1 remote level controls are at each side of the room, and track each other when the wall is open. When the wall is closed, the DR1 at each side only controls the sources found in the same side. The mic inputs are gain-shared to reduce feedback, and the line signals are mixed in at equal volume. For the occasional need to control individual inputs, web controls are available for a tablet, as shown below.