Ok starting from the left is the Lpg 26na. As you would expect with the Lpg neo tweeters, excellent top end dispersion and detail. Very wide open, airy sound. This alum. dome has very low coloration for a metal dome. Compared to the 25nfa silk dome, there is more impact and shimmer, and an "icier" tonal quality. Cymbals and percussion instruments are rendered with more excitement and accuracy, but vocals tend to be a bit cold and hard.
The next shiny chrome tweeter to the right is the Sinfoni mm-1. It's not plated chrome, but actually solid metal. Not much to say about this one. Sounds much like the cheaper Peerless 53ndt. Not as airy or spacious as the LPG, and not able to play as low as the Scan-Speak. Nor does it have the sheer dynamic capability of the larger Avi tweeter. All around, just average.
The one to the right of the Sinfoni is the Avi bsm tweeter. This is one very efficient tweeter with excellent dynamic capability. It gets so loud at times you can really feel that impact in the music, especially on guitar plucks or snares. I felt the top end was a little too soft though, and the lower treble around 10-12khz was a little too aggressive. Other than that it was a good performer. Low coloration, and fairly clean even at high output levels although not as clean as the Scan-Speak.
Last one to the far right is the Scan-Speak 6000-1. It is similar in build to the 6000, but with a grille and a somewhat different frequency response. The sound overall is very forward, focused, and full bodied in nature, with a very soft and laid back top end. Typical Scan-Speak sound except a bit more agressive in nature. The build quality is superb, with a rear loaded chamber and SD-1 motor, which features dual copper rings for lower distortion. It's no surprise then that this tweeter can play flat down to 750hz, and has no problems handling crossover points from 1.5-2khz.