Technical data
Rated load capacity (program)	2 x 6 (15) W
Adjustments at 100 V	2 x 6/3/1,5 W
Cutout diameter Ø	200 mm (±5mm)
Built-in depth	70 mm
Frequency range (±10dB)	90 – 16.000 Hz
Shape	Round
Speaker	2 St. 4" x 2,5"
Dimensions Ø	226 mm
Sound pressure level (SPL) 1 W/1 m	95 dB
Beam angle (-6dB, 1 kHz)	180°
Colour	White
Impedance	8 Ohm
Sound pressure level (SPL) Pmax/1 m	111,2 dB @182Hz

The RC-412AB from RCS Audio-Systems is an A/B ceiling-mounted speaker with integrated 100-V transformers, specifically designed for use in alarm and emergency call systems. It enables space-saving and structured A/B cabling in accordance with DIN EN 50849/VDE 0828, ensuring the necessary redundancy in safety installations. The device features two 10,2 cm ( 4 inch ) x 6,3 cm ( 2,5 inch ) oval broadband chassis with tweeter cones, ensuring clear and even sound reproduction. The impedance is 8 Ohm, and the rated power handling is 2 x 6 W (program power), with a maximum power of 15 W per speaker possible. The sound pressure levels are 95 dB at 1 W/1 m and 111.2 dB at maximum power (Pmax) within the frequency range of 182 Hz. The frequency range covers 90 to 16,000 Hz (±10 dB), ensuring sufficient sound quality for voice transmission and alarm tones. The radiation angle is 180° at -6 dB (1 kHz), enabling even radiation into the front half-space.

Applications
This speaker is intended for use in buildings equipped with emergency call and alarm systems, particularly in areas requiring redundant speaker installations, such as office buildings, schools, hospitals, or public facilities. The A/B cabling allows the second line to remain functional in case of failure of one line, ensuring reliable alarm transmission. The theft-secure mounting method allows horizontal or vertical installation in ceilings or walls, enabling flexible and secure installation.

Functions and Features in Detail
The housing is made of high-quality plastic, ensuring optimal freedom from resonance and vibration. The integrated 100-V transformers allow adaptation to various power levels (2 x 6/3/1.5 W), ensuring flexible integration into existing 100-V amplifier systems. The speakers are designed as oval broadband chassis, achieving a compact form factor while maintaining good sound quality. The white color of the housing ensures discreet integration into ceiling finishes.

Technology Explained Simply
The A/B technology means that two independent lines (A and B) are connected to the speaker, with each speaker having its own transformer. In the event of a fault in one of the lines, the other remains functional, increasing the reliability of the alarm system. The 100-V technology is a standard solution in sound reinforcement, where speakers are connected via a transformer to a high-voltage line to minimize losses over long distances. The impedance of 8 Ohm is a standard impedance for speakers compatible with amplifiers. The sound pressure levels indicate how loud the speaker sounds at a given power level — here, 95 dB at 1 W/1 m is sufficient for clear voice intelligibility.

Compatibility and Accessories
The RC-412AB is designed for use in 100-V systems and can be operated with standard amplifiers for 100-V amplification. The adjustable power settings (2 x 6/3/1.5 W) allow flexible integration into existing installations. Optionally, a humid environment version (option FI-100) is available, where the chassis and transformers are specially impregnated for use in damp environments such as bathrooms or kitchens. For applications with higher safety requirements, the BS-5839 option can be added, including ceramic terminals, a thermal fuse, and fire-resistant cable. Special painting is also available upon request.

Installation and Mounting
Installation is carried out in a ceiling or wall, requiring a cutout of 200 mm Ø (±5 mm). The installation depth is 70 mm, so sufficient space must be available in the recessed area. The dimensions of the housing are 226 mm in diameter. The theft-secure mounting method ensures the speaker cannot be easily removed, making it suitable for public and protected areas.

Operational Advantages
The combination of A/B cabling and 100-V technology ensures high reliability and installation flexibility. The integrated transformers reduce the number of required components and simplify wiring. The white color and round shape allow discreet integration into architecture. The sound pressure levels are sufficient for clear voice transmission, and the frequency bandwidth covers the range relevant for alarm systems. The plastic housing construction ensures stable and vibration-free sound reproduction.