you are not going to get much if any coloration with AKG mics in my experience which includes 390s and 480s, so I would suggest that you avoid the transparent mod which will likely remove any coloration that your stock UA5 would offer, and you want some coloration to reduce background noise, I presently run 480>Digimod UA5 and I'm beginning to think that the Warm mod might offer more coloration might be a better choice for my AKG's