This is an interesting thread.
I own a pair of Omega Super 3 Bipoles with the hemp drivers. I use a Bolder modded SB3 plugged directly into an RWA Signature 30 amplifier. I also use a Martin Logan Dynamo subwoofer.
I am quite aware of the term "strident" being used here. I've been calling it "brightness", or "ringing." I'm not sure what the correct technical term is, but the way the word "strident" is being used here seems to describe what I have heard in my system. It is more apparent on poorly recorded tracks, but it also presents itself when a certain pitch is reproduced, usually in a vocal (female) or with an electric guitar. When it strikes it is quite unpleasant.
I have however made progress. First, switching from a NAD SS receiver to the Sig 30 helped somewhat. Then moving from the fostex drivers to the hemps made an even greater improvement. The little bit of room treatment I've done has also helped. The thing is, its still there. It just shows itself less often.
I tried the Inguz plug-in. It helped, but it also had some side effects I didn't care for. These problems I think will eventually be resolved, but I just couldn't live with the pop and crack sounds between tracks and the buffering "ghost" sound coming through the speakers (sometimes I could actually hear another track being played behind the one I was listening to).
I recently had the opportunity to listen to a fellow ACer's system. His bass was much more prevalent than mine. That, and a comment from one the AC manufactures regarding his perception that my speakers are bass-shy got me thinking. I decided that maybe my subwoofer was not tuned in and placed as well as it could be. After mixing in a little bit more of the sub to take over an extra 15 Hz or so, adjusting the volume higher, and bringing the sub physically closer and more between the speakers, I got some really positive results. First, the bass in my system really sounds quite impressive. The changes I made really helped integrate better with the speakers. Second, the ringing?, brightness?, stridency? has also improved. As a matter of fact, I'm not sure I've heard any fore-mentioned unpleasantness since I made the change this past weekend.
Anyway, my point is not to bash the Omegas. In fact there are so many things that I love about these speakers, including their ability to rip emotion straight out of my gut. I'm merely affirming that I too have experienced some of the things mentioned in this thread.