Holmesglen TAFE Tunnel Project Department. Holmesglen TAFE desired outcome was to simulate as close as possible, the real feeling students get when below ground in their state of the art above-ground Rail and Mine Simulation Tunnels. Tasman AV implemented 12 inch Australian Monitor speakers with 8 inch woofers. Installing them in acoustically suited position was key. Coupled with bluetooth wireless modulation and appropriate power amplifiers, teachers can stream mine sounds at a touch of a button.