Hey there, i am planning to open today the LZ A4 parcell that arrived yesterday from Penon, and willing to drive those with X3ii and E12A.Which filters back/front would you recommend?
Hm it's more based on what sort of sound you like, than whether it's a match for the DAP. The sound will only be differently nuanced coming out of the different sources.
The filters will affect the sound in a much bigger way.
X3ii and E12A is a good combination. Mine was pretty close, X3ii to E12DIY.

The LO is really quite clean, although lately I've been running it Coax out into the Xduoo XD-05.