Martin Audio ACS-40TS-W 4-Inch Passive Two-Way Ceiling Speaker, White (Pair)

The Martin Audio ACS-40TS-W belongs to the ADORN commercial loudspeaker series and is an ultra-compact, two-way ceiling speaker designed for both background and foreground applications where premium performance meets cost competitiveness. Its 4″ (100 mm) LF driver and 0.75″ (19 mm) silk-dome tweeter produce up to 108 dB peak at 1 m. Meanwhile, the ported design extends bass to 73 Hz, delivering high-fidelity sound for music and speech.

Thanks to its very wide 180° conical coverage, the ACS-40TS reduces the number of speakers needed for even coverage—thereby lowering installation cost. Furthermore, it features a shallow back-can to suit ceilings with minimal cavity depth. The built-in transformer supports 70 V/100 V line operation or low-impedance 16 Ω mode, selectable via a rotary switch behind the powder-coated, perforated steel grille. In addition, both LF and HF sections include auto-resetting thermal fuses for full-band-width protection. The bezel-less white grille (RAL 9016) allows a clean finish and can be painted to match décor.

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Key Features

• High-performance two-way ceiling speaker

• 4″ (100 mm) LF driver and 0.75″ (19 mm) HF dome tweeter

• 180° conical coverage pattern reduces required speaker count

• 70 V/100 V multitap line transformer or 16 Ω low-impedance operation

• Low and high-frequency overload protection

• UL 94V-0 rated baffle with zinc-plated steel back-can

• Quick-release bezel-less grille

• Tile rails and C-ring included

• 5-year warranty

Technical Specifications

TYPE
Ultra-compact, passive two-way ceiling speaker, ported bass reflex

FREQUENCY RESPONSE (1)
106Hz–20kHz ±3dB
-10dB @ 73 Hz

DRIVERS
LF: 4″ / 1″ high-temp voice coil, coated paper cone, rubber surround, ferrite motor, pressed steel chassis
HF: 0.75″ silk dome, neodymium motor

RATED POWER (2)
40W AES, 160W peak

RECOMMENDED AMPLIFIER
VIA2004 (for low-impedance operation)

SENSITIVITY (4)
86dB / 1W (4V) / 1m

MAXIMUM SPL (9)
108dB peak

NOMINAL IMPEDANCE
16 Ω

DISPERSION (-6 dB)
180° conical up to 10 kHz

CROSSOVER
3.5 kHz passive (LF and HF auto-resetting fuses)

TRANSFORMER TAPS
70 V: 20 W / 10 W / 5 W / 2.5 W
100 V: 20 W / 10 W / 5 W

RECOMMENDED HIGH-PASS FILTER
75 Hz, 24 dB/oct

ENCLOSURE
UL 94V-0 rated ABS baffle with steel back-can

FINISH
Baffle & grille: RAL 9016 white
Back-can: zinc-plated

GRILLE
Perforated steel, powder-coated, bayonet fitting

CONNECTORS
Ceramic connector (in & link) behind fire-retardant steel cover

ACCESSORIES (INCLUDED)
2 tile rails, C-ring backing plate, cut-out template

DIMENSIONS
(OD) 221 mm × (D) Back Can 97 mm, (D) Inc. Grille 115 mm
(OD) 8.7″ × (D) Back Can 3.81″, (D) Inc. Grille 4.51″
HOLE CUT-OUT DIMENSION
197 mm (7.75″) diameter

WEIGHT
2.2 kg (4.8 lbs)