I am in the process of rolling with all my collection but it takes time
I was stuck and mesmerized by the Elysium...
You're right the Fusion had its moment of fame and it's still very relevant today and excellent point, they deserved proper amplification and I just ran them with N30 this goes to show that it still had a lot under the hood the magnetostatic driver likes its power for sure, this is a much livelier Fusion with N30 and I'd need to A/B but it's also more extended.
Here is a little pic for you
Bass is superb really and the mids are balanced and proficient and still very much great value for money. Fusion is one of those IEMs that are all rounder that do everything right but might not stand out as much as "specialist" tuning. I was reflecting about this about RN6 to which it applies as well. XE6 brother will attract more attention as it's more polarizing. Many IEMs that trigger great passion are polarizing ones
They also have their detractors
N30 so far with every pairing makes a lot of IEMs quite more intense and engaging, as I said it's like everything is duller with other sources
I wonder if Kien is up to a little overdue lineup refresh by the way...