Installed the red filters... sound good. Was a bit of a project and nearly lost them across the table a few times but finally managed to get them in. One question... which direction you they go in? Noticed the red filter cloth is closer to one side then the other and they aren't entirely symetric. I inserted them so that the red cloth is furthest inside the stem. In other words facing the iem. once inserted you see the tube end of the filter instead of the cloth end.
You installed them correctly. Do you notice much of a difference?