Moisture Resistant- Ideal for use In Kitchens & Bathrooms. Works with most Hi-fi and Multi-Room Amplifiers. Built-in Tweeter For Clarity. Moulded ABS Plastic. Easy to Fit. 4- 8 OR 16 Ohm Versions. Sold in PairsB401 Power RMS: 40W Impedance: 4 Ohms Frequency Response: 80-18000Hz Sensitivity: 90 (dBV/Pa) Cutout: 114mm Dimensions: 74 x 147 x 147mm Weight: 1kg B401A Power RMS: 40W Impedance: 8 Ohms Frequency Response: 80-18000Hz Sensitivity: 90 (dBV/Pa) Cutout: 114mm Dimensions: 74 x 147 x 147mm Weight: 1Kg B401C Power RMS: 40W Impedance: 16 Ohms Frequency Response: 80-18000Hz Sensitivity: 90 (dBV/Pa) Cutout: 114mm Dimensions: 55 x 130 x 130mm Weight: 1Kg. Moisture resistant ceiling speaker with a dual cone providing an extended frequency response. Made from moulded ABS plastic and polypropylene cone with a cloth edge. The product is easy to fit and is ideal for both commercial and domestic applications including home cinema- surround sound and multi-room systems. Can be used in kitchens- bathrooms and is compatible with most low impedance amplifiers. Priced and sold in pairs.. ceiling speaker-audio speaker