Technical data
Degree of protection DIN 40050	IP 66
Adjustments at 100 V	15/7,5/3,75/1,9 W
Dimensions (Ø x H)	Ø 206 x L 272 mm
Base impedance	16 Ohm
Shape	Funnel
Material	Plastic
Nominal capacity	20/15 W
Frequency range (±10dB)	400 - 9.000 Hz
Colour	Grey
Sound pressure level (SPL) 1 W/1 m	107 dB

The DH-115 A from RCS Audio-Systems is a pressure chamber speaker with a rated power handling of 20/15 W, designed for sound reinforcement in indoor and outdoor environments. The device features a frequency range of 400 to 9,000 Hz, enabling high speech intelligibility even over long distances. The sound pressure level is 107 dB at 1 W/1 m, ensuring clear and distinct reproduction of speech and signals. The housing is made of impact-resistant ABS plastic in Light Grey (RAL 7035) and is equipped with a foldable mounting bracket made of stainless steel, allowing flexible and secure installation on ceilings or other substructures.

Applications
This speaker is suitable for demanding sound reinforcement systems in public spaces, such as administrative buildings, schools, train stations, shopping centres, or industrial facilities. Its high speech intelligibility and wide frequency range make it particularly suitable for intercom systems, emergency call systems, and general information transmission. The IP66 protection rating according to DIN 40050 ensures high operational reliability outdoors, as the device is dust- and water-tight and functions even in rain or splashing water.

Functions and Equipment in Detail
A central feature of the DH-115 A is the rear-mounted impedance selector switch, which allows quick selection between four different settings for 100-V operation (15 W, 7.5 W, 3.75 W, 1.9 W) as well as a low-impedance mode. The base impedance is 16 Ohm, making the speaker suitable for use in intercom systems. The waterproof PG cable entry ensures a secure and durable connection for the supply cable, minimizing the risk of moisture ingress and short circuits.

Technology Explained Simply
The pressure chamber design ensures that the speaker achieves high efficiency and clear, distortion-free sound reproduction. The frequency range of 400 Hz to 9,000 Hz indicates that the speaker is primarily designed for speech transmission, as human speech typically falls within the range of approximately 300 Hz to 8,000 Hz. The high sound pressure level of 107 dB at 1 W/1 m enables good audibility even in large rooms or in the presence of ambient noise. The IP66 protection rating means the device is protected against dust and water jets, making it suitable for outdoor use or in damp indoor environments.

Compatibility and Accessories
The DH-115 A is designed for use in 100-V networks, commonly used in many professional sound reinforcement systems. The various settings allow flexible integration into existing installations. Optionally, the housing can be painted in any RAL colour, enabling adaptation to the architecture or design requirements of the installation site. Installation is performed using the foldable stainless steel bracket, which ensures secure mounting to ceilings or other substructures.

Installation and Mounting
Installation is carried out using the integrated U-bracket made of stainless steel, which can be fully folded to allow flexible mounting on various surfaces. The waterproof PG cable entry simplifies wiring and ensures a durable, weatherproof connection. The speaker dimensions are Ø 206 mm x L 272 mm, representing a compact design with high performance.

Operational Advantages
The DH-115 A offers high operational reliability due to its IP66 protection rating and vibration-free construction, which ensures clear sound reproduction without buzzing or vibrations. The flexible adjustment via the impedance selector switch enables easy integration into existing systems. The use of impact-resistant ABS plastic and stainless steel ensures long service life and resistance to environmental influences. The high speech intelligibility and clear sound make this speaker a reliable choice for professional sound reinforcement systems.