The Freebird is a 3 Channel valve Equaliser and comes in Thermionic Culture’s half rack design format and has a built-in but detachable power supply. It will work normally as a stand alone unit but if desired The Freebird can be put in a Thermionic Culture 19 inch rack case together with another unit to give 6 channels of EQ, or you can add a different Thermionic Culture half rack unit such as The Nightingale.