Selenium 8W4P 8-Inch Woofer Selenium 8W4P 8" Woofer This woofer offers excellent performance in the mid frequency range and is great for sound reinforcement in nightclubs, dancing halls, auditoriums, bands, or for use in studio monitors. Cone. Selenium 8W4P 8" Woofer Selenium 8W4P 8" Woofer