This sub speaker works very dang well. I needed a sub speaker that was really slim like 2″ to 3″deep to fit in my sub box in a Nissan Frontier. This speaker sounds wonderful. It thumps a little but the sound is great. I didn’t want a sub speaker that would really thump because the air pressure hurts my ears but a wanted something that sounded like it was thumping. If that makes any sense. I do have 2 of these in a slim sealed box and i am only using a 500 watt amp. Overall I really enjoy the sound and durability of these.