It's 3am here, so what better to do than rip out my er4s filters and try some new colors? Well, I have one pair of orange filters, and as I am pretty sure I'll be using red or green for a while, I decided to try the orange first so not to waste any filters. Surprisingly, they don't sound that bad. In fact, they pretty much retain all of the awesomeness of the er4s, but like the red, with a slightly different signature. I'm finding it a bit more bass present. In fact, I with the green and red filters had the bass of the orange filters, without the further specific treble peak reductions.
The only drawback for me personally is that the treble is missing that perfection it has with the other two filters. The orange just takes that one or two treble points and lowers them "just" enough that the overall smoothness and accuracy of the treble is too off for me. But I would say it is pretty much the same "amount" of difference from red to orange as there was from green to red. So, still a very slight difference. I'm so used to analyzing the crap out of these things that I noticed it right away, but I could see someone having to listen for a while to get used to the differences.
Ironically, with the minute changes the filters make, I would take the er4s with ANY filter so far over any other earphone. The difference is negligible compared to the difference between any other earphone. So, for those who really want the most of the bass presence and don't mind sacrificing the utmost treble accuracy, the orange are pretty good. Again, if the difference between the xba3 and er4s is 25% the difference between filters is more like 1-2%. But even still, I prefer the red/green filters to the orange so far. I'll leave them in a little longer and see how things go, but I feel like trying the green again for a while...
On another note (musical pun!), I tried a few things, such as using tweezers, to remove my filters while preserving them. Was not happening. Once I used the tool to remove them, I was surprised at how much you need to pull them out. Nothing major, but compared to any possible grip with tweezers, etc., that just isn't happening. At least not for me. You really need the solid grasp of the filter tool to apply the appropriate amount of force needed... Just an fyi.