GAS syndrome...

My pal who acquires and parts with fine guitars with alacrity pointed out this link to me and I think it is similarly descriptive of myself with audio gear, although I am sort of getting a handle on it.  At least that is what I tell myself.  The first step to ending a compulsive behavior is an awareness of it. :-)
Yup - the trouble is it is worse for musicians! You only ever need a few audio systems but you can never get enough musical instruments as they all have unique qualities...
And I thought that you meant Great American Sound. Jim Bongiorno is smiling somewhere.
Gardener's Syndrom, a constant desire to trim and improve (mods), can be as bad as GAS.
+1 viridian
+2 viridian!