Join Date: Aug 2002
Location: The Land of Enchantment
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Most likely because of damping, or strictly speaking the inverse of, as expressed by Qts. The HO is a more damped, lower Qts driver which tends to work best in ported enclosures, whereas the HF is a higher Qts, less damped driver. Higher Qts drivers also tend to have a lower Fs & F3 and require larger box sizes.
Keep in mind those are just generalizations and there's a lot of leeway depending on the application. For example, another Dayton driver, the Ultimax is a higher Qts driver than both of these and works fine in ported and sealed enclosures. In the case of these two drivers, they're pretty close.
You could model them in different configurations to get close to the response you want based on your needs. With speakers there are always compromises.
"Rock and roll is alive and alright" Sloan