a V-caps is a capacitor brand.
What Tubeman did was to built his own portable capacitors by getting a casing and soldering the SonicCaps(the capacitor he used) with a mini plug and then house them in a casing.
you can go down to Jaben and try their Crossroads Mylarones. Its a good for its value
or you can also try the single driver IEMs such as the UM1, SF3, SE110, SCL2, er6/i
the UE attenuator changes the UM2 sound signature by a bit. The P>S converter changes the sound signature by alot its like day to night different. I havent got to try the Shure volume yet