The visual has dominated critical theory, but sound offers a different ontology. Jonathan Sterne's audile technique reveals how listening practices are historically and technically constructed—from the stethoscope to the microphone, each medium shapes what can be heard and how. Brandon LaBelle's acoustic territories show that sound structures space and subjectivity in ways vision cannot capture: vibration propagates through walls, around corners, across distances, producing zones of inclusion and exclusion that are felt before they are seen. Flow-channeling, in this register, becomes sonic modulation—not just movement of bodies or data but propagation of frequency, rhythm and resonance. Infrastructure Studies reveals the acoustic materials that shape built space—the concrete that reflects, the insulation that absorbs, the ventilation systems that hum. Science and Technology Studies traces how listening practices are socio-technically constructed, showing how expertise in sound is distributed and contested.