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8" In-Ceiling Speaker for Fire Signaling with 5-Watt 70V Transformer and U51-8 Baffle
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AtlasIED's UHT70C-U51-8 are 8" diameter single voice coil speakers equipped with dual (whizzer) cone and 10 oz. ceramic magnet to deliver extended frequency response with high intelligibility and minimal distortion. Cost-effective units are complete with fire-retardant moisture-proof cones, factory-mounted 70.7V transformer, 6" color-coded leads, DC blocking capacitor and a 51-8 baffle. To comply with UL requirements, speaker packages must be used with UL-approved enclosures.


  • Attractive Ceiling-Loudspeaker/Baffle Assemblies Provide Unobtrusive Appearance of Life Safety and Emergency Signaling Loudspeakers
  • Listed Under UL Standard 1480 (Speakers for Fire-Protective Signaling Systems)
  • Selection of Baffle Styles and Multi-Tapped Transformers Meet a Variety of Aesthetic and Application Requirements
  • Selection of UL Approved, Companion Enclosures is Offered
  • UL Listed, Fire-Retardant and Moisture-Proof Cone Loudspeakers Reproduce Emergency Alarm and Voice Instructions with Superior Intelligibility and Extended Frequency Response


Frequency Response 85Hz - 8kHz
Sensitivity 97dB Peak, 94dB Avg.
Power Taps .5, 1, 2, & 5 Watts
Power Rating 10 Watts
Diameter 8" (20.32 cm)
Depth 2 7/8" (7.3025 cm)
Shipping Weight 4.67 lbs (2.12 kgs)
Safety Listed 1480


Manuals & Technical Documents

SpecificationAtlas Audio-UHT70C-U51-8-Spec Sheet.pdf