I have owned the 3 and now the 2 monoblocks. I have found that Black Diamond #4 cones improve the sound considerably. They seem to my ear to tighten up the bass and brighten up the top end a bit. They are recomended for tube amps I know, but I found them to work well under the Aleph amps, which sound kind of tubelike. Even better if you have the means would be a Powersnakes Viper V2 powercord. I bought a pair for my Aleph 2s and they took the sound to a whole new level, improving transparency, speed and most of all image placement.