Cloud Microphones CL-4 Cloudlifter 4-channel Mic Activator, Rack Four channel, rack mounted Cloudlifter version provides mics with up to +25dB additional output sensitivity Provides 2 distinct stages of ultra-clean gain Recommended for use with all passive microphones and compatible with tube, battery, or power supply driven microphones Easy to use self contained design requires only phantom power Rack mount steel enclosure, for studio, stage and broadcasting