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Ceiling SeriesInstalled Sound


Ceiling Mounted, Two-Way Vented Enclosure

C8.1T Loudspeaker | Ceiling Series
Where to Buy or Rent

The C8.1T has been specifically designed for higher ceilings where its high SPL capability and controlled 90° dispersion enable it to provide excellent intelligibility in more reverberant rooms. It features an 8" (200mm) unit with a carbon fibre loaded, polypropylene cone and a 1" (25mm) horn-loaded dome tweeter mounted side-by-side for optimum dispersion and smooth response off-axis.


  • Two-way high performance flush mounting ceiling speaker
  • 8" (200mm) UL94V-0 carbon fibre loaded polypropylene cone bass
  • Wide dispersion – 90° conical up to 7kHz
  • High & low impedance operation – transformer included
  • 110dB max SPL @ 1 metre (16 ohm)
  • 125 watt power handling (60W through transformer)
  • Polyswitch and thermal fuse protected
  • Steel backcan
  • UL2043 & UL1480


  • Fixed installations in ceiling and walls
  • Bars and restaurants

The enclosure is ported to extend the low frequency performance and the 5-point mounting system ensures that installation is fast and secure. Input and link terminals make paralleling units a simple operation and a steel cover plate protects the input connector against fire.

These products comply with UL2043 Fire Tests for Heat & Visible Smoke Release for Discrete Products and their Accessories Installed in Air Handling Spaces.

Listed UL1480 General Signalling Speakers.


User guide Datasheet Measurement Data Settings [v4.1]
TYPE Ceiling mounted, two-way vented enclosure
-10dB @ 50Hz
  • 8" (200mm) UL94V-0 PP bass driver
  • 1" (25mm) dome tweeter
RATED POWER (2) 125W AES, 500W peak
MAXIMUM SPL (9) 110dB continuous, 116dB peak
DISPERSION (-6dB)90° conical up to 7kHz
CROSSOVER3kHz passive
ENCLOSURESteel backcan
  • Bezel & grille – white UV resistant (Overpaintable)
  • Backcan – zinc plated
CONNECTORSRising clamp plug and socket
ACCESSORIES (included)
  • 60W 70/100V line transformer
  • Tile rails
  • C bracket
  • Paint mask
  • Cut-out template
  • 100V – 60W, 30W, 15W
  • 70V – 60W, 30W, 15W, 7.5W
DIMENSIONS(OD) 354mm x (D) 258mm
(OD) 13.9ins x (D) 10.2ins
CUT-OUT DIAMETER308mm (12.14 ins)
WEIGHT6.7kg (14.8lbs)
Architectural Specs
Martin Audio C8.1T

The loudspeaker shall be a two-way, in-ceiling system consisting of an 8” low frequency transducer and a 1” dome high frequency transducer mounted in a ported enclosure. The enclosure shall comprise a pressed steel backcan with a UL94V-0 fire-rated moulded baffle. The transducers shall be protected by a removable, perforated steel grille.

Input connection shall be made via a four-pin rising-clamp plug and socket with loop-through capability to enable pre-wiring with up to 2.5mm2 cable prior to installation. The connector shall be protected from fire by a steel cover with a clamped cable entry. An attachment tag on the backcan shall enable direct attachment to the building structure as a secondary support.

The loudspeaker shall include a steel support ring and tile rails.

Dispersion shall be 90° conical up to 7kHz. The on-axis frequency response shall be 80Hz-18kHz +/- 3dB and the loudspeaker shall produce a maximum SPL of 116dB peak calculated at 1 metre. Power handling shall be 125W AES, 500W peak.

The loudspeaker shall be equipped with a transformer for 70V or 100V line operation, with taps selected by a rotary switch on the front baffle. The switch shall also provide for 16 ohm low impedance operation of the loudspeaker.

Dimensions (OD x D) shall be 354mm x 258mm (13.9ins x 10.2ins). Weight shall be 6.7kg (14.8lbs).

The loudspeaker shall be the Martin Audio C8.1T.

Martin Audio C8.1T Tech Drawing

Technical Drawings for C8.1T.
All information is Copyright. Martin Audio Ltd.


Plaster Ring

Plaster ring for C8.1T

Construction Ring

Construction ring for C8.1T

Available in this Series

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Copyright Martin Audio Ltd.
Subject to change without notice.
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