Speaker toe-in & stereo imaging

I think you're correct to assume that this would be speaker specific, but as others have mentioned don't limit yourself strictly to the manufacturer's recommendations either.

I have three different pairs of ProAc speakers and in their manuals they recommend toeing in the speakers so that only the front baffles are visible from the listening position. I've found this set up to yield a very precise center image without sounding bright, but I have always preferred to have them angled out a bit so that I can see roughly an inch of each speaker's inner sides. In my room, this creates a wider soundstage without sacrificing focus very much.

I've heard 104/2s facing straight out and wondered if toe-in would help them. I also felt that they needed a sub. How is the HGS working with them?

Where a loudspeaker has a line array configuration, like a Magnepanar, and the tweeter section is on the outside, (per Magnepanar instructions) this has the effect of toe in, so you may want to keep the speakers physically straight. But then I have heard some people say that they like their Maggies with the tweeters inside, which would be toed out. Go figure.

Thanks for the informative responses. I do not yet have the pair of 104/2s (they are being shipped), and have never heard these speakers. I bought the pair based on reviews I've read, and on experience with my four 102/2s and 100C. I really like the sound of my bi-wired 102/2s and 100C, and they blend seamlessly with my Velodyne HGS-10. I realize that the 104/2s do not have the Uni-Q HF driver, whereas the 102/2s do. Even though the pair of 104/2s are said to be late serial number bi-wired units, I doubt they will come with a manual. I plan to add a second HGS-10, and a techie at KEF suggested setting the crossover at 50 Hz -- I use 80 Hz with the 102/2s.

db

Just a few thoughts to add to those above:
A speakers crossover point (and woofer dispersion/size) will also effect toe in especially since some 2 way units will drive their woofers above 4K. The beaming that results will cause a greater variation in the upper mids between on axis & off axis response.
The distance from the speaker pair & the proximity of the side walls can also be very significant. Trying a variety of positions is the key. Changing the location, height or angle of a speaker usually changes the sound far more than many often spoken of tweeks or cable changes.
-Torin