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Ceiling SeriesInstalled Sound


Ceiling Mounted, Two-Way Vented Enclosure

C4.8T Loudspeaker | Ceiling Series
Where to Buy or Rent

The C4.8T is an extremely compact, two-way flush mount loudspeaker designed to deliver high performance and high intelligibility in a wide range of applications. The unit consists of a 4" (100mm) bass driver with a UL rated, carbon fibre loaded polypropylene cone and a 0.8" (19mm) dome tweeter mounted side by side on the baffle.


  • Two-way high performance flush mounting ceiling speaker
  • 4" (100mm) UL94V-0 carbon fibre loaded polypropylene cone bass driver
  • Very wide dispersion – 180° up to 10kHz
  • High & low impedance operation – transformer included
  • Fireproofed rising clamp plug and socket for easy pre-wiring
  • 100dB continuous max SPL @ 1 metre
  • Steel backcan
  • Tile rails and C bracket included
  • UL2043 & UL1480


  • Fixed installations in ceiling and walls
  • Low ceiling environments

C4.8T's configuration easily outperforms coaxial stalk-mounted tweeter or single driver arrangements in terms of wide dispersion and smooth off-axis frequency response. The exceptionally wide dispersion of the C4.8T makes it particularly suitable for installation in low ceilings where significantly fewer units will be required to cover a particular area.

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 @ 80Hz
  • 4" (100mm) UL94V-0 PP bass driver
  • 0.8" (19mm) dome tweeter
RATED POWER (2) 40W AES, 160W peak
MAXIMUM SPL (9) 100dB continuous, 106dB peak
DISPERSION (-6dB)180° conical up to 10kHz
CROSSOVER5kHz passive
ENCLOSURESteel backcan
  • Bezel & grille – white UV resistant (Overpaintable)
  • Backcan – zinc plated
CONNECTORSRising clamp plug and socket
ACCESSORIES (included)
  • 25W 70/100V line transformer
  • Tile rails
  • C bracket
  • Paint mask
  • Cut-out template
  • 100V – 25W, 12.5W, 6W
  • 70V – 25W, 12.5W, 6W, 3W
DIMENSIONS(OD) 205mm x (D) 131mm
(OD) 8.1ins x (D) 5.1ins
CUT-OUT DIAMETER178mm (7.01 ins)
WEIGHT2.6kg (5.7lbs)
Architectural Specs
Martin Audio C4.8T

The loudspeaker shall be a wide-dispersion, two-way, in-ceiling system consisting of a 4” low frequency transducer and a 0.8” 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 180° conical up to 10kHz. The on-axis frequency response shall be 100Hz-20kHz +/- 3dB and the loudspeaker shall produce a maximum SPL of 106dB peak calculated at 1 metre. Power handling shall be 40W AES, 160W 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 205mm x 131mm (8.1ins x 5.1ins). Weight shall be 2.6kg (5.7lbs).

The loudspeaker shall be the Martin Audio C4.8T.

Martin Audio C4.8T Tech Drawing

Technical Drawings for C4.8T.
All information is Copyright. Martin Audio Ltd.


Plaster Ring

Plaster ring for C4.8T

Construction Ring

Construction ring for C4.8T

Available in this Series

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Copyright Martin Audio Ltd.
Subject to change without notice.
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