Quote:
Originally Posted by Aevum 
i have never examined the UM2, so i cant say how the armatures are configured,
im just saying, theres a difference,
look at the custom-2 vs the custom-3,
the Custom-2 has a dual armature, while theres 2 armatures, they are in the same armature casing and cover the same freqnecy range
while the Custom-3 has 2 armatures, with their own distictive casing, covering each a specific specture of the frequency range,
theres a differenace between 2 armatures and dual balanced armatures,
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Not to be too specific into those Klipsch's IEMs, I just want to point out that it is possible to have both one unit (meaning in one casing), dual receivers, one way (cover the same freq.) BA drive (like Custom2 in this case), and one unit (meaning in one casing), dual receivers, two ways (cover different freq.) BA drive. In theory, both are still 'dual armature' despite the fact the one is one way and the other is two ways.
For example:
One unit, dual receivers, one way BA trasducer: Knowles DTEC Series
It combines two Knowles TEC series BA into one casing (mainly to increase the SPL).

One unit, dual receivers, two ways BA trasducer: Knowles TWFK Series
It has one woofer and one tweeter in one casing, actually designed for used in IEM.

Even if you use the DTEC series, you can probably use a crossover circuit to make it into a two ways transducer (won't be very useful since both receivers inside are full range anyway).
My $0.02.