As part of the ADORN commercial series, the ACS-55T is a compact, two-way ceiling speaker designed for background and foreground applications that require premium performance and cost competitiveness.


  • High performance two-way ceiling speaker
  • 5.25” (135mm) LF driver and 0.75” (19mm) HF dome tweeter
  • Wide 150° conical coverage pattern reduces speaker count required for even coverage
  • 70V/100V multitap line transformer or 16 ohm low-impedance operation
  • Low and high-frequency overload protection
  • UL94V-0 rated baffle with zinc-plated steel backcan
  • Quick release, bezel-less grille
  • Tile rails and C-ring included
TYPECompact, passive two-way ceiling speaker, ported bass reflex
FREQUENCY RESPONSE (1)98Hz-20kHz ± 3dB -10dB @ 62Hz
  • LF: 5.25” /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)50W AES, 200W peak
RECOMMENDED AMPLIFIERVIA2004 (for low-impedance operation)
SENSITIVITY(4)90dB / 1W(4V) / 1m
MAXIMUM SPL (9)113dB peak
DISPERSION (-6DB)150° conical up to 7kHz
CROSSOVER3kHz passive (LF and HF auto-resetting fuses)
TRANSFORMER TAPS70V: 30w / 15w / 7.5w / 3.75w
100V: 30w / 15w / 7.5w
ENCLOSUREUL 94V-0 rated ABS baffle with steel backcan
FINISHBaffle and grille: RAL9016 white Backcan: zinc plated
GRILLEPerforated steel, powder-coated, bayonet fitting
CONNECTORSCeramic connector (in and link) located behind fire-retardant steel cover
  • 2 tile rails
  • C-ring backing plate
  • Cut-out template
  • (OD) 245mm x (D) Back Can 192mm, (D) Inc. Grille 209mm
  • (OD) 9.7in x (D) Back Can 7.55in, (D) Inc. Grille 8.23in
HOLE CUT-OUT DIMENSION222mm (8.74”) diameter
WEIGHT3kg (6.6lbs)