You could argue a 5 star rating by value ,but there are so many woofers out there that have varying requirement for different uses. That said I have built speakers for over 30 years now, and I can vouch that these Daytons are versatile and very competitive at this price level. They work well ported or sealed, can be used as a woofer in many 3 way systems ,or as auto or home sub woofer. I made use of them for a main tower pair for stereo /home theater use. Each speaker has 2 ported ds175's and 1 sealed ds 175 electronicaly crossed below 420 hz ,set below a mid and tweeter. They are as good as many name brand factory woofers in speakers around a thousand a pair and below. Many buyers like replacing blown woofers with the ds175's which is fine- if If you understand matching a speaker to the proper chamber volume ft3. They are however capable of use in a good DIY ground up build for custom speaker building. They are not a thumping sundown audio megawatt beast but a good solid performing woofer with good extension,and tight bass accuracy ,very refined quality sound with decent power handling that works well in properly designed multiple woofer configurations.

Love this speaker sounds better than what i had and it feels heavy which means well made, thanks