20-150 HZ TEST. HERE IS THE VERY RARE AND VERY FINE EV 30W WOOFER. WHEN INSTALLED INTO A CABINET, NOTHING CAN TOUCH THE BASS OUTPUT, CLARITY, AND NATURAL SOUND OF THE EV 30W. VIDEO SHOT WITH PHOTO CAMERA SO VOLUME IS NOT VERY LOUD. IN PERSON, THIS WAS SHAKING OUR ENTIRE HOME AND MY CHEST FELT HARD TO BREATH. GOTTA HEAR IN PERSON!