The Arcane Ear is a block that will emit a strong redstone signal when it's matching Note Block is triggered within a 64 block radius, creating a sort of wireless redstone. You can tune the pitch and instrument the Arcane Ear listens for just as you would a Note Block. The Goggles of Revealing may be worn to show which pitch it listens for.
Thaumonomicon Entry
"The arcane ear is a device capable of detecting the sound emitted from nearby note blocks. If it hears a note it recognizes, it will release a short redstone pulse."
Crafting
You need to use an arcane workbench to craft this. It is crafted like so:
Essentia
- 10x aer
- 10x ordo