
Two-Way 4" Ceiling Speaker
Ultra-Compact


The ACS-40TS brings full-frequency response, consistent coverage and intelligibility to a wide range of architectural environments — from hotels and concourses to retail outlets, bars and restaurants.
Comprising a 4” (100mm) LF driver and a 0.75” (19mm) silk- dome tweeter, the ACS-40TS produces 108dB peak output at 1 metre and has a high-fidelity sonic character ideal for both music and speech reproduction. Its ported design delivers strong bass that extends down to 73 Hz.
The very wide 180° conical coverage of the ACS-40TS makes it particularly suitable for low ceilings and reduces the number of speakers required for even coverage — leading to a reduction in installation cost. It features a shallow backcan for installation in ceilings with a minimum cavity depth.
It incorporates a high-quality transformer for 70V/100V line operation, with transformer taps selected by a rotary switch accessible behind the powder-coated, perforated steel grille. The switch also provides for 16-ohm low impedance operation — enabling four or more speakers to be driven in parallel from a single amplifier channel. For full-bandwidth protection, the low and high-frequency sections are individually against overload by auto-resetting thermal fuses.
The grille is bezel-less for a clean look, its bayonet fitting is easy to remove without the use of tools and finished in white (RAL9016) to match ADORN on-wall loudspeakers and may also be painted to blend with any décor.
Data sheets, manuals and resources for the Adorn ACS-40TS

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The ACS-40TS brings full-frequency response, consistent coverage and intelligibility to a wide range of architectural environments — from hotels and concourses to retail outlets, bars and restaurants.
Comprising a 4” (100mm) LF driver and a 0.75” (19mm) silk- dome tweeter, the ACS-40TS produces 108dB peak output at 1 metre and has a high-fidelity sonic character ideal for both music and speech reproduction. Its ported design delivers strong bass that extends down to 73 Hz.
The very wide 180° conical coverage of the ACS-40TS makes it particularly suitable for low ceilings and reduces the number of speakers required for even coverage — leading to a reduction in installation cost. It features a shallow backcan for installation in ceilings with a minimum cavity depth.
It incorporates a high-quality transformer for 70V/100V line operation, with transformer taps selected by a rotary switch accessible behind the powder-coated, perforated steel grille. The switch also provides for 16-ohm low impedance operation — enabling four or more speakers to be driven in parallel from a single amplifier channel. For full-bandwidth protection, the low and high-frequency sections are individually against overload by auto-resetting thermal fuses.
The grille is bezel-less for a clean look, its bayonet fitting is easy to remove without the use of tools and finished in white (RAL9016) to match ADORN on-wall loudspeakers and may also be painted to blend with any décor.
| TYPE | Ultra-compact, passive two-way ceiling speaker, ported bass reflex |
| FREQUENCY RESPONSE | 106Hz-20kHz ± 3dB, -10dB @ 73Hz |
| 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 | 40W AES, 160W peak |
| RECOMMENDED AMPLIFIER | VIA2004 (for low-impedance operation) |
| SENSITIVITY | 86dB / 1W(4V) / 1m |
| MAXIMUM SPL | 108dB peak |
| NOMINAL IMPEDANCE | 16Ω |
| DISPERSION (-6dB) | 180° conical up to 10kHz |
| CROSSOVER | 3.5 kHz passive (LF and HF auto-resetting fuses) |
| TRANSFORMER TAPS | 70V: 20w / 10w / 5w / 2.5w 100V: 20w / 10w / 5w |
| RECOMMENDED HIGH-PASS FILTER | 75Hz 24dB/oct |
| ENCLOSURE | UL 94V-0 rated ABS baffle with steel backcan |
| FINISH | Baffle and grille: RAL9016 white Backcan: zinc plated |
| GRILLE | Perforated steel, powder-coated, bayonet fitting |
| CONNECTORS | Ceramic connector (in and link) located behind fire-retardant steel cover |
| ACCESSORIES (included) | 2 tile rails, C-ring backing plate, Cut-out template |
| DIMENSIONS | (OD) 221mm x (D) Back Can 97mm, (D) Inc. Grille 115mm (OD) 8.7in x (D) Back Can 3.81in, (D) Inc. Grille 4.51in |
| HOLE CUT-OUT DIMENSION | 197mm (7.75”) diameter |
| WEIGHT | 2.2kg (4.8lbs) |
About Penguin Media Solutions
Penguin Media Solutions is a professional audio, video, and lighting design, installation, and maintenance company based in Brighton, UK. As an authorised Martin Audio dealer, we provide high-performance AV systems for commercial venues, hospitality, and event spaces across Brighton, London, and South-East England.
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