Originally Posted by
mbrooke
Based on an email discussion with Steven mead, the Ultra 4 and the Ultra 3 are the dame depth, the same as a Wick 3. The difference is rim diameter, 26 mm vs. 26.4 mm. The Ultra 4X is a little bit shallower than the Ultra 4. I have had both the Ultra 4 and 4X and did not find much difference between the rims, although some folks have commented that the 4X rim is sharper. Compared to my Wick 4AM, the ULTRA 4X rim is sharper, but it feels slightly larger. Sound wise, I definitely prefer the 4X on my Willson. The 4AM sounds more resonant, but lacks core and has a "tinny" quality to the sound. But, of course, this may not apply to you.
Mike