I havent heard the bigger GMAs but the bookshelf models I have heard are clearly flawed in the bass region IMO. The mid-upper bass which gives an acoustic instruments its woodiness character and to some extent the body was lacking seriously IMO. I have heard it with at least 4 different sources, 5 different amps and a similar number of cable iterations and nothing did anything to change my opinion. If you want me to believe that all the equipments were flawed and only the speaker was truthful (because it can be explained through Physics), hmmmmm you very well know what my reply would be. Moreover it is not all that difficult to identify the characteristic sound of a speaker, at least the fundamentals come through pretty early. What I guessed about GMA on my first audition remains true even today, say after 20th audition.
Having said that I am pretty aware of what "revealing" speakers do and sound like. I have owned some studio monitors from Dynaudio Acoustics in the past and currently use ATC at home. In my experience, just showing up differences in cables or an isolation device is just the beginning of the "revealing" chapter. There is lot more to it. Nowadays even a $500 speaker can easily show differences between cables !! Not a big deal in my books. I know GMAs are better than that but saying that they dont have very little signature sound and all they do is show up the rest of the chain is an extraordinarily exaggerated overstatement IMO.
