what 'acrylic zing' in the GPA would that be?acrylic zing of the GPAs
there is no acrylic in my GPA racks; there is carbon fibre, however. are you specifically saying that 'all' GPA racks sound that way to you? the entry level shelves of the GPA racks are acrylic, btw. the Formula shelves are carbon fibre.
having owned a Basis 2500 tt (which was a fine tt even if mostly acrylic) i am familiar with the tonal shift inherent in acrylic. not sure i'd call it a 'zing'; but it's not stricktly musical to my ears, either.
to me acrylic is a cost effective material which has a good cost value relationship and at lower price points is a good material choice; sorta like digital amps for full range. beyond a certain level it does limit performance.