Ambient infrasound noise contains an abundance of information that is typically overlooked due 16 to limitations of typical infrasound arrays. To evaluate the ability of large-N infrasound arrays to 17 identify weak signals hidden in background noise, we examine data from a 22-element array in 18 central Idaho, USA, spanning 58 days using a standard beamforming method. Our results include 19 nearly continuous detections of diverse weak signals from infrasonic radiators, sometimes at 20 surprising distances. We observe infrasound from both local (8 km) and distant (195 km) 21 waterfalls. Thunderstorms and earthquakes are also notable sources, with distant thunderstorm 22 infrasound observed from ~800-900 km away. Our findings show that large-N infrasound arrays 23 can detect very weak signals below instrument and environmental noise floors, including from 24 multiple simultaneous sources, enabling new infrasound monitoring applications and helping 25 map the composition of background noise wavefields.