Carbon FEQ and Carbon ATM for Synergistic Atmosphere or FEQ.
I trust my ears and was surprised obvious improvement using Synergistic Research newer carbon atm on top of atmosphere XL4 tower.
It originally came with a red atm then then subsequently SR came out with green ATM and now there is a carbon atm albeit came out for carbon feq.
I think red has always sounded excellent and green was a little too bright for my solid state system IMHO but carbon atm seems best of both worlds.
Now I am sure some are outright dismissive and you are entitled to your opinion but am curious of those who bothered to listen to it what their perception is..