The 3X has a higher quality attenuator, which is so expensive they had to discontinue the unit, and plus you get a separate power supply. The K5XE is newer technology. I was not overly impressed with the K5XE when I owned one, although it was ok for the money and I was comparing it with more expensive units. One guy at Ayre that I spoke with (not Charles) said he liked the 3X, and if I were going to buy one of those two, that is what I would try this time around. There is one on A'gon for $1,850 now.
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