pyle audio makes the best subwoofers ever and they are cheaper and they are good they can hit hard and shake the whole house if you put them in a proper enclosure pyle audio makes the blue wave series the red label series and the blue label series and they come in 8 inch 10 inch 12 inch 15 inch 18 inch and 21 inch i wanted to get a 21 inch subwoofer but the problem is they are a little more expensive and they are just too heavy for me to carry and so yeah with a sealed enclosure and a car amplifier these things can bang and plus they can have very heavy bass and can shake the whole car if you put them in a car or they can shake the whole house if you use them for home audio and home theater systems