Dayton Audio Ultimax II UMII18-22 vs original UM18-22 side by side comparison
I had hoped to give my audience and those interested a side by side test of the version 2 Ultimax and the version 1. Unfortunately my box will not fit the version two without modification. The basket is too wide to fit into my cutout. I am unwilling to modify my cabinet to fit the version 2 because that is not the intended home for these drivers. I have reached out to some of the locals to see if anyone has a spare 18” box we can test with in the meantime while I repair my box, since I damaged it in attempting the trial fit.

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Dayton Ultimax II UMII18-22 Test and Review in a Sealed Enclosure

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June 1, 2026

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