Dayton RSS265HO-4 vs UM10-22

About $30.

dennismv said:

According to Dayton tech support, Reference is more musical, Ultimax focuses on low frequency applications, like home theaters, but both are good for home or audio.

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Yes, that is correct. They can both be used in car or home application but they both have drastically different box requirements. The reference can stay very linear while being in a small enclosure and can take a bit more power. Very good choice for small spaces that you just simply can't fit a big box. The low frequency on this sub is not very efficient though so you need to port this sub in order to bring alive the lows, but even in a small sealed box, it can still hit frequencies from across the board effortlessly. The ultimax is a great sub that focuses on low frequencies but requires a much bigger box to do so, mainly used in home theater but I have seen these in cars as well. It's more efficient with power but would require atleast double the size box than the reference to make it sound the best. So I would ask myself.. how important is low frequency? How important is space? 

Dayton HO series is designed for car audio environments where space is a concern- they work well in small boxes. The Ultimax is more efficient, stiffer suspension, higher excursion and a shorting ring.