|Joker|: I really like this set of reviews. They read as very objective, well thought out, and articulate. I often refer to this thread for offering IEM recommendations to my friends, as well as for my own purchases.
In fact, it was this thread that persuaded me to purchase the revision of the MEElectronics AI-M9. I have to say, I am very impressed with the sound for such a competitive price. I also own the Denon C551, and I feel the M9 offers an overall cleaner sound for about half the price. The M9's also provide a far better fit, having a smaller housing, which allows me better isolation and better bass impact.
Initially, I used the M9's with the medium tips, but with the longer housing, they protruded farther from my ears than I would prefer (when wearing them over the ear), or would sound too dark if I shoved them further in the ear canal. I found using the small tips yields an increase in isolation, while brightening up the sound without any decrease in bass impact or quality. I do not consider myself to have small ears and have always used medium tips; however, in this case, since the enclosure is longer, the earphones can sit further in the canal with smaller tips.
For anyone with the M9 revision and accustomed to medium tips, I would recommend giving the smaller tips a try. The signature sounds far cleaner and fairly detailed. I feel these earphones punch far above their price range, with great build quality to boot.
Thank you once again for the detailed reviews.