Golden Age Project COMP554MK2 500 Series CompressorGolden Age's Vintage style 500 Series Comp Gets Even Better The Golden Age Comp 554 MK2 delivers the same vintage flavored, 2254 style compression as its predecessor, but it also boasts upgraded knob and switches, plus an even more robust design. Rocking an all discrete, Class A signal path, the single channel Comp 554 MK2 is well spec'd with stepped controls, flexible sidechain filter options, stereo linking, Golden Age's AIR circuit, and more.