Giveaway: EQ550 5 Band Equalizer for Win and Mac FREE March 13, 2018 Leave a Comment on Giveaway: EQ550 5 Band Equalizer for Win and Mac FREE Posted in Giveaway MAC, Giveaway Windows, Mac Apps, Windows Apps EQ550 simulates a legendary Proportional-Q custom opamp equalizer, beyond the original hardware. Giveaway: link Download: Gem EQ550 (MacOS X 32 and 64-bit) – Gem EQ550 (Windows 32-bit) – Gem EQ550 (Windows 64-bit)