The Atlantic Technology IC-6.1 is a compact ceiling loudspeaker with big sound and high performance that will surprise even critical listeners. It features a long-excursion 6.5 inch GLH (Graphite-Loaded Homopolymer) woofer and a pivoting 1 inch soft dome tweeter, coupled with a sophisticated crossover network. In addition, the IC-6.1 has magnetically attached grills, and an ultra-thin bezel design for a more refined look. Combine its high-quality drive units, sophisticated crossover network, and easy installation, and you have a speaker whose performance, flexibility, and value is unmatched. The crossover network is the speaker electronic circuitry that splits up the incoming full-bandwidth audio signal and sends the lower frequencies to the woofer and the higher frequencies to the tweeter.