Cloud Microphones CL-2 Cloudlifter 2-channel Mic Activator Gives passive microphones up to +25dB of ultra clean gain; no need to reinvest in an expensive, high-gain premap Dual-mono operation for multi-mic or stereo applications Self-contained, driven only by the phantom power from your mixer or preamp Active output signal prevents added noise over long cable runs Among them are passive ribbon mics, such as the Royer R121 (#581141 or MXL R40 (#H69305), and low-sensitibity dynamic mics, such as the Shure SM7B (#270247) and the Electro-Voice RE20 (#270009)