ISO: Imperceptible Sounds Observatory #2 – May 2011
Based on the area around Den Haag KABK (Koninklijke Academie van Beeldende Kunsten)
Source 1: Tree at Prinsessgracht
Source 2: MalietoreN structure building at Utrechtsebaan
Source 3: Tram wire at Koningskade
Source 4: Crane at Koningin Julianaplein
Technical details: Acelerometer by Brüel & Kjaer model 4514 002, Aquarian Hydrophone H2a, DPA4060, Zoom H4 internal mics and recorder, Arduino UNO, 4 IR sharp sensors model GP2Y0A41SK0F, 4 cresta PBB17 monoculars, 4 camera tripods and 4 active speakers.