Hi Gordon and George,
there are some significant differences between these two speakers, as auditioned with my gear:
- The Odysseys have a kind of glare in the 400-500Hz and 4-5kHz range, not present in the X - O's can be annoying and can sound shouty at times.
- There is no doubt the crossover quality is much higher in the X. This may account for the improvements described above.
- Yes the Odysseys' panel is 4" taller, but I haven't perceived the X's lacking image size. Perhaps the Xstat panel is really superior to the older design.
- The bass is undoubtedly tighter and more dynamic in the X. In addition, I have gone to great lengths in reducing the bass output from the O's with that custom in-series Caddock resistor I now use - the X's will hopefully enable me to better integrate them in my room with the 25 and 50Hz controls - especially the 50Hz, where I have a +14dB peak that I tame with the sub in reverse phase.
- The X sounds so damn clear in the midrange, and I couldn't detect any high frequency hardness that I can (slight) with the O's.
- The X's tonal balance can vary significantly with the rake angle - that's a drawback. At 0 vertical, I can't stand them. At ~-2 degrees they are magical; being able to adjust this way for one's failing ears, over the coming years, is a real plus.
- I have measured the X's at the dealer's (presumably optimally set up), and the bass response in his room is much smoother than the O's in mine - I have a bit of thinness in the 160-200Hz region as well. I will be doing a home audition to see how they behave in my room.
- I really need my REL powered on for as smooth reproduction as possible, and for very low-end articulation and weight; the O's are not articulate enough for me, and the differences w/ and w/o the sub are very evident, especially with kickdrum and of course pipe organ. There is so much low-end detail coming out of the Spectrals that only the REL and the X's can capture.
Overall, the X's sound more together and believable than the O's and they both sound spectacular. But it's the comparison with the Magico Q5 that was the eye opener for me. Frankly, overall, I walked away thinking that the X was on par with the Magico, despite the Q5's uncanny sense of space and be-there illusion.
There is absolutely no doubt that I will shed a lot of tears when the O's go, if I decide to pull the trigger, but there is no doubt from what I've heard that the X is a truly remarkable speaker. I've also fallen in love with the clear-aluminum-wenge combination I have in mind. I think the X is a not only a real bargain, but one thrilling speaker.
Other speakers I have yet to audition are the Rockport Ankaa, Vienna The Music, Marten's Bird, Gordon's MBL 116s, and I am passing on the Wilson Sashas (still colored), the Magico V3 (unmusical), the Magnepans & the CLX (due to size) and some others.