Noise protection Noise protection along railway lines Type A3-e (DB-88) Type A3-e (DB-88) Aluminium sound panels · single-sided · highly absorbent TECHNICAL DATA Sound absorption DIN EN 1793-1: DLA 9 dB = A3 Airborne sound insulation DIN EN ISO 140-3: R´W 30 dB DIN EN 1793-2: DLR 26 dB = B3