5" Ceiling Loudspeaker for EN54-24 Applications


5" Ceiling Loudspeaker for EN54-24 Applications

CSS-15C-VA is a full-range, EN54-24 certified ceiling speaker consisting of a 127 mm (5 inch) full-range dual-cone driver, torsion-mounted into an included easy-install blind-mount metal fire dome. The speaker is designed to provide clear and intelligible sound for applications requiring EN54 certification and/or BS5839 compliance.


·       Component: 127 mm (5 in) fullrange dual-cone loudspeaker

·       EN54-24 certified and compliant with BS5839-8 standard.

·       6W, 3W and 1.5W multi-tap transformer for use on 100V distributed speaker lines.

·       Metal fire dome with easy blind-mount installation; clip-in torsion-mount speaker.


Frequency Range (-10 dB)

180 Hz – 20 kHz

Power Capacity

6 Watts (at 6W tap)

Rated Pink Noise Power

6 Watts (at 6W tap)

Rated Pink Noise Voltage

100V distributed speaker line voltage

Nominal Sensitivity

92 dB (6W tap, ave 300 Hz – 15 kHz)

EN54 Sensitivity (@4 m)

80 dB (at 4m, 6W tap, per EN54-24 spectrum and measurement conditions)

Coverage Pattern

120° conical (2 kHz)

Coverage Angles (by Frequency) 

Conical (Vertical & Horizontal)

4000 Hz: 100° 2000 Hz: 120° 1000 Hz: 180° 500 Hz: 180°

Reference Axis for Specifications

The reference axis for specifications is directly on-axis vertically and horizontally, directly below the speaker as

speaker is installed in the horizontal ceiling plane.

Rated Maximum SPL

100 dB @ 1m (3.3 ft) average SPL (6W tap @ 100V)

EN54 Max SPL (@4m)

88 dB (at 4m, 6W tap, per EN54-24 spectrum and measurement conditions)

Nominal Impedance

6W @ 100V tap: 1667 Ω

3W @ 100V tap: 3333 Ω

1.5W @ 100V tap: 6667 Ω

Transformer Taps

6W, 3W, 1.5W at 100V. Selected by sliding the included fast-on connector onto the proper tab on the transformer.


Thermal fuse, open temperature 150 degrees C; 2A@250VAC; UL, CUL, VDE, PSE and CCC approved.


127 mm (5 in) dual-cone driver, paper cone


Input +, Input -, Earth Ground (connected to metal speaker baffle). Ceramic block with brass inserts (3.2 mm / 0.12 in.

opening) accommodates 2.5 sq mm / 12 AWC wire.

Safety Agency

EN54-24 certified (Certificate No. 1488-CPR-0524/W), Compliant with BS5839/8; IP-21 per IEC529/60529; ROHS,

CE compliant. In accordance with IEC60849/EN60849 systems.

Ambient Temp Range

-10°C to +55°C


Fire dome installation via two metal clamps, affixed via hex head clamp screws from inside of fire dome. Speaker

installation via two torsion springs into hooks on inside of fire dome. See installation instructions.

Wire Entrance

Two diaphragm-type sealed-grommet entrance points on backcan in 20 mm (0.82 in) diameter cutouts that can be

field fitted with installersupplied 19 mm (3/4-inch) mount gland nut for additional seal or strain relief.


Metal fire dome, metal speaker baffle, metal grille.


162 mm (6.4 in) fire dome diameter (outside of clamps);

183 mm (7.2 in) speaker baffle diameter;

116 mm (4.6 in) depth from bottom of ceiling surface to back of fire dome;

129 mm (5.1 in) total depth.

Ceiling Cutout Size

165 mm (6.5 in) diameter hole ±2 mm (0.1 in).

Ceiling Thickness Range

0.5 mm (0.02 in) to 23 mm (0.9 in) ceiling thickness

Net Weight

1.5 Kg (3.3 lb) per speaker

Shipping Weight

1.9 Kg (4.2 lb) per speaker