Spectrograph: Listen & Download Spectrograph .mp3 Error! Change your browser, please! ⇓ Download General noise, Factory work ⚠ Small centrifuge ⚠ Off, standby, Forklift, on ⚠ Stop, work, Lathe turning on ⚠ Grind metal on a grinding machine in a ⚠ Industrial exhaust fan ⚠ Compressor industry ⚠ Electric welding ⚠ Heidelberian sorting printer ⚠ Hydraulic machine up ⚠ Newspaper press ⚠ Electric generator (hum) ⚠ ★★★★★