Overview

DU 31EN is a two-way flush mount speaker with flexible design suitable for paging and background music for several type of installations. It is equipped with a 4" woofer and a 1" tweeter. It features a line transformer for the connection to 100 / 70 V constant voltage lines, allowing to select among 3 different power levels. The rear cover A 1331 (not included) makes it suitable also for wall or surface installation. 

Features

• 4" woofer and 1" dome tweeter.
• Power selectable (100 V): 8 W – 4 W – 2 W.
• 82 dB sensitivity.
• Colour white RAL 9002.
• Flameproof plastic body, steel grille.
• In/out ceramic terminal block.
• Thermal fuse protection.

Specifications

Acoustical specifications

• Frequency Response (-10dB): 100 Hz - 17000 Hz
  
• Max SPL @ 1m: 91 dB
  
• Max SPL @ 4m: 79 dB
  
• Coverage angle: 180°
  
• System Sensitivity: 82 dB
  
• System Sensitivity 1W @ 4m: 70 dB
  

Power section

• Power Handling: 8 W
  
• Peak Power Handling: 32 W PEAK
  
• Protections: Thermal fuse
  
• Recommended Amplifiers: DXT 3000, DXT 4000, DXT 7000
  

Transducers

• Dome Tweeter: 1 x 1.0''
  
• Woofer: 1 x 4.0''
  

Input/Output section

• Input connectors: Ceramic screw terminals
  
• Output connectors: Ceramic screw terminals
  
• Constant Voltage Transformer: 100 V
  
• Power selection 1: 8 W - 1250 ohm
  
• Power selection 2: 4 W - 2500 ohm
  
• Power selection 3: 2 W - 5000 ohm
  

Standard compliance

• IP protection grade: IP 21C
  
• Safety agency: CE compliant
  
• EN54-24 certified: Yes
  
• CPR number: 0068-CPR-234/2025
  

Physical specifications

• Cabinet/Case Material: Plastic
  
• Grille: Steel
  
• Color: White - RAL 9002
  

Size / Weight

• Height: 175 mm / 6.89 inches
  
• Width: 151 mm / 5.94 inches
  
• Depth: 56 mm / 2.2 inches
  
• Recessed Depth: 38 mm / 1.5 inches
  
• Weight: 0.6 kg / 1.32 lbs