Cloud Microphones CL-1 Microphone Preamp

Cloudlifter CL-1 Mic Activator — Clean Gain for Passive Microphones

The Cloud Microphones Cloudlifter CL-1 is an inline mic activator built for one job: giving low-output passive microphones up to +25 dB of ultra-clean, transparent gain before the signal ever reaches a preamp. The Cloudlifter CL-1 is the right tool for podcasters, broadcasters, and studio engineers who rely on dynamic and ribbon mics that demand serious gain without the hiss that comes from pushing a preamp to its upper range.

Designed to sit between the microphone and the preamp or audio interface, the CL-1 is powered entirely by the +48V phantom power already present on the input, so no batteries or external supplies are required. At the same time, it deliberately does not pass that phantom power through to the microphone itself, which makes it safe to use with vintage ribbons and tube mics that cannot tolerate +48V.

What Sets the Cloudlifter CL-1 Apart

Inside the steel chassis sits a patented Class-A discrete JFET circuit that directly couples the microphone to the preamp, with no transformers, capacitors, or resistors in the direct audio path. The JFET chips were originally developed for military and scientific applications, and Cloud Microphones uses them to deliver two stages of clean gain that preserve the natural character of the source instead of coloring it.

Gain and Signal Path — +25 dB of Transparent Boost

The headline spec is +25 dB of additional active output, measured at a 3 kΩ load, which is enough headroom to bring a whisper-quiet ribbon or a low-output dynamic like the SM7B up to a healthy working level. Because the gain happens before the preamp, the preamp can stay in its most comfortable, lowest-noise range rather than being cranked to its upper third where noise and coloration creep in.

• Gain: +25 dB (at 3 kΩ load) — enough to drive low-output passive mics to full level
• Circuit Topology: Patented Class-A discrete JFET, direct-coupled — no transformers, capacitors, or resistors in the audio path
• Number of Channels: 1 — single-mic inline activator for focused signal chains

Connectivity and Power Requirements

The CL-1 is a true inline device: it accepts a single XLR mic-level input and outputs a single XLR mic-level signal, so it drops into any existing XLR cable run without rewiring. Power comes from the +48V phantom supply on the host interface or mixer, and the unit blocks that phantom from passing downstream to the microphone.

• Input: 1x XLR 3-pin female (mic level) — standard balanced mic input
• Output: 1x XLR 3-pin male (mic level) — feeds any preamp, interface, or mixer
• Power: +48V phantom power from host device — no batteries or external supply needed

Build Quality and Compatibility

The enclosure is a rugged steel chassis with provisions for stage or stand mounting, and the unit is handcrafted in the USA and backed by a limited lifetime warranty with registration. The 3 kΩ input impedance is specifically chosen as an ideal load for dynamic, ribbon, and tube microphones, which is why the CL-1 is recommended for Shure SM7B, Electro-Voice RE20, Royer R-121, AEA R84, and dozens of similar passive mics.

• Input Impedance: 3 kΩ — ideal loading for dynamic, ribbon, and tube mics
• Chassis: Rugged steel enclosure with mounting provisions — built for studio, stage, and broadcast
• Warranty: Limited lifetime (with registration) — long-term coverage for working pros

Who the Cloudlifter CL-1 Is For

The Cloudlifter CL-1 is the right choice for podcasters, voice-over artists, broadcasters, and studio engineers who run low-output dynamic or ribbon microphones into interfaces or mixers that do not deliver enough clean gain on their own. It is also a strong fit for live streamers, remote-conference users, and field recordists capturing quiet sources like acoustic instruments, Foley, or nature recordings where every bit of headroom matters. Anyone using an SM7B, RE20, or a passive ribbon into a typical home-interface preamp will hear an immediate drop in noise floor and a noticeable opening up of the mic's natural character.

Cloud Microphones and the Cloudlifter Story

Cloud Microphones designs and handcrafts its products on the Navajo Nation and in Tucson, Arizona, and the Cloudlifter line has become the industry-standard inline gain stage for low-output passive microphones. The patented technology is licensed by Shure for use in the active SM7dB microphone, and the CL-1 in particular is recommended by audio professionals worldwide for broadcast, live, and studio work where transparent, noise-free gain is non-negotiable.