The 7000 series in-ceiling speaker. 89 dB efficiency. 1 inch aluminium adjustable tweeter type. Glass fiber woofer type. Suitable for moisture rich environments. Fully adjustable treble easily tailors the sound to any taste. Features glass fiber woofers that provide superior power capacity for a stronger, deeper sound. Foam gaskets minimize vibration and provide air-tight seal. High-power handling and adjustment capabilities ensure ultimate in home sound. High-grade advanced crossover allows for optimal frequency distribution.