The SL4 speakers of the company Adastra are designed for installation in false ceilings or interior ceilings and distribute sound uniformly downwards. The power and impedance of them are 20W RMS and 8Ω respectively, which means they can be connected to an amplifier with the corresponding characteristics. These are 2-way speakers, meaning the sound frequencies are reproduced by two speakers, a tweeter for the highs and a woofer for the lows. A high-quality ceiling speaker can provide uniform coverage and satisfactory frequency response, so it can be used for speech reinforcement or for low-intensity music applications (background music).

• Sensitivity: 88dB
• Colour: White