References

A word from a customer
Tunnels
2019Length(m)#Microphones
Plabutsch tunnel9.989282
Gleinalm, 2nd tube8.426118
Mils tunnel1.75242
2018Length(m)#Microphones
Southwick tunnel49010
Kollmann tunnel63316
Kaisermühlen tunnel2.13497
Wald tunnel2.82665
Spering tunnel2.87062
2017Length(m)#Microphones
Arlberg tunnel15.516175
Gleinalm tunnel, 1st tube8.436119
Wilten tunnel50913
Klaus-Spering tunnel2.03146
Dalaas tunnel1.81019
2016 Length(m)#Microphones
Oswaldiberg tunnel4.302119
Kroislerwald tunnel67919
Liefering tunnel50314
Flirsch tunnel1.12619
2015Length(m)#Microphones
Ehrentalerberg tunnel3.34575
Lendorf tunnel80020
Trettnig tunnel45012
Falkenberg tunnel1.09026
Bosruck tunnel5.505122
Götschka tunnel4.43586
Pernau tunnel2454
Neumarkt tunnel1.97038
Lest tunnel54512
2010Length(m)#Microphones
Kirchdorf tunnel (pilot system)2.80749