Re tonal accuracy, I listen to many types of music and have tried this on both systems.
The AVI are very good at defining each element in a track, and have great clarity and separation which is sometimes hard to find in an average passive system. However, when listening to these individual elements (a piano note, a string, a voice) I find the AVI don't have the same realism with reproducing individual sounds. Pianos sound unusually high, strings don't quite have enough bite, voices sound a little filtered etc. However, the AVIs are very clever in pulling everything together in a dynamic, entertaining sound that is versatile in all genres. I have to accept that Naim and Harbeth isn't great for rock, for example.
I don't have any agenda here, as I own and enjoy both systems. What I did find (and see earlier threads) is that when I bought the AVI I found them to be equally matched and possibly preferable to the Naim, but living with them over time I have realised that the AVI are initially very impressive (and still are for the money) but I have matured in my own taste for music and find I get much more long term satisfaction that I return to again and again with the Naim. I can see why AVI do so well in the showroom and initially outshine a passive system but I wouldn't have them as my main system. But, I maintain, they cannot be beat for the money.
The other day I tried the AVI back in the lounge on the same stands as the Naim system. I played a few tracks, finishing on some nick drake. The AVI were very good, and hard to fault. But, placing the Harbeth back on the stands and popping the same Nick drake track on that I had just played, it opened up and I remember just falling back in the chair. It sounded amazing, and I find it hard to forget the emotional connection I had with the music at that moment.
I have never heard the AVI with a sub, nor with the new tweeters so perhaps that will take them up a notch. I wouldn't mind a 'plus model' with better drivers, better quality cabinet as I believe it's a great product idea and like the simplicity. I know Ashley is trying to keep the costs down for the mainstream market, but an upgraded version would sell, and it would sit between the 9 and the 40.
Ps, I cannot understand why they are now only available in gloss black or white. I love real veneers, and this new direction is a big shame for me. Gloss finishes are impractical and are limited with decor suitability. I like the small size of the 9s though.
Like I said, I don't have an agenda here, and really like the AVI but it's a shame to hear people have spent sums like 7k on a system and not been as happy with it as with the AVI. Just shows how important room interaction is, and system synergy.