I would certainly be willing to do that test, as it is not one I have done before. I have moved the various super tweeters around on the top of the loudspeakers and I have turned them facing the back wall. In all these cases the top end suffered. I will attempt turning mine sideways and see what that does in the next few days. Let me say I have just not experienced the comb filtering problem as talked about, but I will turn them sideways and have a listen!