Pressure chamber loudspeaker
Poeschel ETG

The TR-30-T was specially developed for public address systems in road tunnels and parking garages with poor ventilation. It is housed in a grey plastic enclosure (ABS self-extinguishing) with a multi-position swivel bracket made of stainless steel type V4A 1.4529, resistance category III. The M20 cable screw connection provides protection against high water penetration. An additional hole in the pressure chamber allows the water to drain off after tunnel cleaning procedures. This horn is also equipped with a compatible high-pass filter.

Resistance to:

- Emissions of gasoline and diesel engines

- Road salts such as sodium chloride (NaCl) and calcium chloride (CaCl)

- Corrosion in conjunction with concrete (alkaline water)

- Traffic dust pollution

- Traffic vibrations