MEDC DB4B Loudspeaker


Up to 25 Watts, Ex d(e), Weatherproof

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DB4B loudspeaker range up to 25 watts

The DB4B is a high power explosion proof loudspeaker, introduced as a replacement for the current DB4 with improved intelligibility and acoustic performance. Certified for use in a wide range of temperatures from -55°C to +70°C the Ex enclosure is manufactured from GRP with a rugged thermoplastic flare providing a corrosion free and aesthetically pleasing product.


  • Ex d / Ex de IIC/IIIC T4/T5/T6
  • Ex d IIC/AEx d IIC Gb
  • ATEX certified
  • IECEx certified
  • UL certified for USA and Canada
    • Class I, Div 2, Groups A-D
    • Class I, Zone 1, Ex d IIC/AEx d IIC Gb
    • Class II, Div 2, Groups F & G
    • Zone 21, AEx tb IIIC
    • Class III, Div. 1
  • TR CU certified
  • CQST certified
  • INMETRO certified
  • CCOE certified
  • SIL 2 certified
  • DNV type approved (IEC60945)
  • CSFM certified
  • Certified temperature -55ºC to +70ºC*
  • IP66 & IP67/ NEMA 4X & 6
  • Optional Ex e terminal chamber
  • 124dB at 25W, 1m*
  • 8W, 15W & 25W versions
  • Power tappings, via integral transformer
  • Frequency response 350Hz – 8kHz
  • Ex enclosure – glass reinforced polyester
  • Flare – high impact thermoplastic polyester
  • Internal earth stud fitted as standard
  • Stainless steel mounting bracket and cover screws
  • Mounting bracket has ratchet facility as standard
  • Optional swivel bracket available
  • Optional resettable fuse†
    * Depending on version
Technical Specification
Area ClassificationZone 1, Zone 2 & non-Ex use.
Ambient Operating Temperature-55°C to +70°C
Ingress ProtectionIP66 & IP67
MaterialEx enclosure – Flame retardant, UV stable Glass Reinforced Polyester
Flare – Flame retardant, UV stable thermoplastic polyester
Output110 dBA at 1W at 1 metre
Transformer100V line or 8Ω
124 dBA at 25W at 1 metre (long flare IIC version)
EntriesUp to 2 x M20 or 1/2″ NPT. Blanking plug available
WeightEx d – 5kg, Ex de 5.8kg. Based on long flare with transformer
Tappings25, 12.5, 6, 4, 2, 1 (at 25W)
OptionsPower (8W, 15W, 25W), body colour, suitable for Gas or Gas and Dust, Ex atmospheres,
Tag & duty labels, entries, capacitor, short flare,
Ex e terminal chamber, transformer voltage

MEDC DB4B Loudspeaker