Technical data
Speaker diameter	130 mm
Sound pressure level (SPL) 1 W/1 m	91,5 dB
Colour	White
Impedance	8 Ohm
Sound pressure level (SPL) Pmax/1 m	98 dB @3kHz
Rated load capacity (program)	4 (6) W
Shape	Angular
Built-in depth	60 mm
Radiation angle (-6dB, 1/4/8 kHz)	180°/ 100°/ 45°
Frequency range (±10dB)	75 - 18.500 Hz
Side length	178 mm
Adjustments at 100 V	4/2/1 W

The SC-104 in-ceiling speaker from RCS Audio-Systems is a ceiling-mounted speaker designed for use in 100-V systems. It features quick and tool-free installation via a quick-tension fastening mechanism. After lifting the sheet metal plate — for example, using a screwdriver — four mounting screws can be tightened, securely fixing the speaker in the ceiling material. The construction is theft-secure, as the sheet metal plate cannot be removed without tools after installation.

Applications include commercial, public, and private spaces where discreet yet reliable sound distribution is required. The speaker is particularly suitable for voice and background sound systems, such as in offices, waiting areas, shops, or schools. The modern, understated design with a frame height of approximately 2 mm ensures the speaker integrates seamlessly into the environment without causing visual disturbance.

Functions and features in detail include a high-quality 5¼˝ wideband chassis with an integrated tweeter. This design ensures excellent speech intelligibility and a balanced sound reproduction across the entire frequency range. The rated power handling is 4 W (program power), with a maximum power handling of 6 W. The sound pressure levels are 91.5 dB at 1 W/1 m and reach 98 dB at 3 kHz at maximum power. The dispersion angles are 180° at 1 kHz, 100° at 4 kHz, and 45° at 8 kHz, enabling broad yet targeted sound distribution.

Technology explained simply shows that the speaker is designed for 100-V systems, where power is adjusted to the speaker via a transformer. The adjustments at 100 V allow for three power classes: 4 W, 2 W, and 1 W, enabling volume to be adapted to room size and requirements. The impedance is 8 Ohm, which is standard for such systems. The frequency range (±10 dB) extends from 75 Hz to 18,500 Hz, enabling clear reproduction of speech and music.

Compatibility and accessories include use with suitable mounting frames, such as the mounting frame EZ-110, designed for installation in ceilings or walls made of brick, concrete, or similar materials. Installation requires a square cutout with a side length of 145 mm in the ceiling material.

Installation and mounting can be done without special tools, except for a screwdriver to lift the sheet metal plate. The installation depth is 60 mm, and the side length of the housing is 178 mm. The housing shape is rectangular, and the color is white. The weight is approximately 1.1 kg. The mounting design allows even non-specialized technicians to install it.

Operational advantages include secure, theft-secure mounting, low frame height for discreet appearance, high speech intelligibility, and flexible power adjustment via 100-V systems. The speaker is designed for permanent indoor use and is suitable for a wide range of applications requiring reliable and unobtrusive sound distribution.

Note: The mounting frame EZ-110 is not included in the delivery scope.