do you feel that they hit low notes smoothly in the right box? very much an install dependent attribute... I could have a subwoofer capable of go as low at 20Hz but I can set up the enclosure, amp, or HU to modify whether it will receive a signal that low... So that question is kind of useless... I'd say you're better off asking people's opinions in general on any of the subwoofers you are interested in. Many of the members have experience with a wide variety of setups and drivers and amplifiers... If you want, you can search the subwoofer/speaker forum and just look around... These subwoofers that are being mentioned have been the topic of dozens of threads... If there is something specific you don't see in them that you want to know, then you can ask that... Just sayin...