SELENIUM 12MB3P 12-Inch Woofer/Midbass High efficiency (101 dB 1W/1m)3" flat wound aluminum voice coil Selenium's 12MB3P was developed to excel at midbass sound reproduction in professional speaker systems. Suits vented, sealed, and horn-loaded applications High efficiency (101 dB 1W/1m)3" flatwound aluminum voice coil Rugged construction Smooth, extended response for maximum flexibility Suits vented, sealed, and horn-loaded applications