SDL400M-BT, Silver

The SDL400M-BT by WHD is a powerful Bluetooth master loudspeaker designed for invisible installation behind stretch ceilings, combining seamless design integration with high-quality sound performance. Engineered and Made in Germany, it is the core unit of the SDL stretch ceiling system.

Thanks to its ultra-flat profile (only 58 mm), the speaker can be completely hidden behind stretch ceilings, illuminated ceilings, or mirrored surfaces—preserving a clean, uninterrupted interior design. Despite its concealed installation, the SDL400M-BT delivers clear, natural, and well-balanced sound, achieved through a precisely optimized crossover and bass reflex design that enhances low-frequency performance.

Equipped with an integrated Bluetooth amplifier (2 × 5 W), it allows direct wireless music streaming from smartphones, tablets, or laptops—no external amplifier required. As a master unit, it can connect up to three SDL400-S passive speakers, enabling scalable multi-speaker setups for a more immersive sound experience.

A refined and intelligent solution for invisible audio systems where simplicity, design, and performance meet.