My 2 brothers bought KG 5.5s and IMO they sounded great overall. I felt they lacked low end, yet were used in an HT environment with a sub, so in that role worked great. Very efficient speakers. For dedicated 2 channel listening, I think they are great for certain types of music, but soso for other types of music. I have not heard the Reference Series. All in all, Mike is correct; all that matters is how they sound to you.
