Do you need a Cloudlifter or FetHead for a dynamic mic?

The gain knob on the Scarlett Solo has nowhere left to turn. The Shure SM7B is two fingers from your mouth, the meter in the Mac's Sound settings twitches a third of the way up, and on Zoom somebody asks you to speak up for the second time. So you lean in and talk louder, and in the gaps between sentences there is a thin, steady hiss, like a fridge in the next room.

That is the exact moment people start searching for a Cloudlifter. Sometimes it is the right purchase. Sometimes it is $129 spent on a problem that lives somewhere else: in the room, in the distance to the mic, or in a call app that squashes your level no matter what reaches it. The way to tell them apart is arithmetic, plus one ten-second test.

The short answer

You need a Cloudlifter, a FetHead or a similar inline preamp only when all three of these are true:

1. The mic is a passive dynamic or ribbon mic on an XLR cable (SM7B, RE20, PodMic, SM58 and so on).
2. Your interface runs out of gain before your voice reaches a healthy level, or reaches it only in the top part of its range where its own hiss becomes audible.
3. The hiss you hear is electrical, not the room.

If any one of them is false, an inline booster will not change what people hear. If you are still choosing between an interface and a standalone preamp, and have not bought either yet, Do you need a mic preamp? is the page you want instead: it covers the bigger box, while this article covers the small tube that sits in the cable.

What a Cloudlifter does

A Cloudlifter is a small steel box with an XLR socket at each end and a Class-A JFET amplifier inside. Cloud Microphones rates the Cloudlifter CL-1 at up to +25 dB of gain with a 3 kΩ input impedance. There is no battery and no power plug: the box runs on the 48 V phantom power your interface sends down the mic cable.

Here is the clever part. A dynamic mic does not need phantom power, so on most setups that 48 V goes unused. The Cloudlifter grabs it, uses it to amplify the signal, and does not pass it on to the microphone. That is why it is safe in front of ribbon mics, which phantom power can damage. It is also why the box is called a "mic activator": a passive mic now behaves like an active one with a much hotter output.

The same design sets two traps that catch people on day one:

• Phantom power off means silence. If the 48 V button on that input is not on, the Cloudlifter has no power and nothing comes through. It is the classic "my new booster is broken" moment, and it applies to every inline booster, not only this one.
• It will starve a condenser. Put a condenser mic after a Cloudlifter and the mic gets no phantom power, because the box blocks it. Cloud says plainly on the product page that a phantom-powered condenser would need a separate 48 V supply.

And a booster cannot work with a USB microphone at all. There is no analog cable to sit in. If your mic plugs straight into the Mac by USB, close this tab: the answer for you is in mic too quiet or in the mic's own gain setting.

Do I need a Cloudlifter? Do the arithmetic

Shure publishes the numbers for its own mic. In a support article on SM7B gain, Shure says that normal speech 3 inches (about 7.5 cm) from an SM7B produces about -69 dBV at the mic's output, and that the preamp should have at least 60 dB of gain to bring that close to line level. Shure adds that many interfaces only offer 40 to 50 dB, which is not enough.

Now line that up against real interfaces sold today:

The gain figures come from Focusrite's Solo spec page, the 2i2 spec page and Shure's MVX2U page. The 6-inch column uses the rough rule that doubling the distance to a mic costs about 6 dB.

Look at the 6-inch column, because that is where most people actually sit. The SM7B has a big windscreen and a tempting distance of "a comfortable hand away", and every extra few centimetres eats level that the interface then has to make up. Moving from 15 cm to 7.5 cm wins back about 6 dB, a quarter of what a Cloudlifter adds, for free. Try that first.

The table also says something the marketing does not: on an interface with 65 dB or more of clean gain, a quiet SM7B is usually a distance problem, not a hardware problem. The gain staging guide walks through setting levels so you neither clip nor drown in hiss, and it applies with or without a booster.

Is the hiss electrical or the room? A ten-second test

A booster raises everything that enters it. If the noise in your recording is a laptop fan, a street, a neighbour's TV or the echo of a bare room, the Cloudlifter amplifies it by exactly as much as your voice. Nothing improves. Only one kind of noise gets better with an inline preamp: the hiss the interface itself adds when you push its gain high.

You can find out which one you have before buying anything:

1. Set the interface gain where you normally use it.
2. Unplug the mic cable from the interface (turn phantom power off first, out of habit).
3. Record ten seconds of silence in QuickTime or any recorder. That is the interface's own noise at that gain.
4. Plug the mic back in, stay silent and record another ten seconds. That is the interface plus your room.
5. Play both back with headphones at a fixed, loud volume.

If the two clips hiss about the same, the interface is the noisy part and a booster will help, because it lets you turn that knob down. If the second clip is clearly louder, or you can hear a hum, a fan or traffic in it, the room is the problem. A booster will not fix it. A closer mic position, a quieter corner or noise reduction will. Why your mic has static covers the electrical hums and buzzes that are neither, such as ground loops and bad cables.

Why software gain does not replace a Cloudlifter

The tempting shortcut is to leave the interface where it is and turn the level up afterwards: in the call app, in OBS, in a plug-in. It feels identical, since the meter goes up either way. It is not identical, and the reason is the order in which noise joins the signal.

The interface's preamp adds a small, fixed amount of hiss. Once the signal is converted to digital, your voice and that hiss are a single waveform. Software gain multiplies that waveform. Twenty decibels of digital gain makes the voice 20 dB louder and the hiss 20 dB louder. The ratio between them, which is what a listener perceives as "clean", does not move.

An inline booster works before that point. It lifts your voice by 25 dB or so while the signal is still in the cable, so the interface can run 25 dB lower, where its own noise contribution is smaller relative to the voice. The booster adds noise of its own, but it is designed to add less than a preamp pushed to its limit. That is the whole trick, and no amount of processing on the Mac can do it after the fact.

What software can do is different, and useful. If your test above shows a clean but quiet signal, the voice well clear of the hiss, then plain gain or a loudness control in software is perfectly fine: it is a level problem, not a noise problem. And software noise reduction can lower a steady hiss in the pauses. What it cannot do is recover detail that the analog stage buried under its noise. That limit applies to every app, TunedMic included.

FetHead vs Cloudlifter

These are the two names people compare most. They do the same job in different packaging.

Sources: the Cloudlifter CL-1 page and the FetHead page.

A few details matter more than the 2 dB gap in the brochure:

• Load. Triton rates the FetHead's 27 dB into a 3 000 Ω load. Your interface's input impedance decides what you actually get. The Scarlett Solo 4th Gen, for example, lists a 3 kΩ mic input, which matches that rating.
• Weight on the mic. The FetHead hangs directly off the mic's XLR socket. On a mic hanging from a boom arm, that adds length and a little weight right at the connector, which some arms and cable routes handle better than others. The Cloudlifter sits on the desk or is strapped to the stand, at the cost of one more cable.
• Variants. Do not mix up the FetHead with the FetHead Phantom. The Phantom version is for condenser mics, gives less gain (18 dB) and does pass 48 V on to the mic. For a dynamic mic you want the plain FetHead.

If the price gap matters, the FetHead is the cheaper way to the same result. If you want something that stays on the desk and can be moved between mics without twisting it onto each one, the CL-1 is easier to live with. Both are sold as clean gain, not as tone shapers. What you pay for is the lower noise floor.

Cloudlifter alternatives

The Cloudlifter line itself has grown. As of October 2026, Cloud Microphones' Cloudlifter range includes the CL-1 ($129), the Mini CL-25 ($149), the two-channel CL-2 ($249), the CL-X and CL-Z, which Cloud pitches for tone control, and a two-pack bundle. For one voice mic, the plain CL-1 is the one that matters.

Outside Cloud, these are the real options:

• sE Electronics DM1 Dynamite. A slim tube like the FetHead, +28 dB, 48 V phantom, no phantom passed to the mic. Its sibling, the DM2 TNT, switches between +15 and +30 dB. Both are on sE's inline preamp page.
• An interface with more gain. Often the better spend. Replacing a 57 dB interface with a 69 dB one solves the same problem and leaves one less box in the chain. Do you need an audio interface on a Mac? covers which ones work without drivers.
• A mic with the booster inside. Shure's SM7dB is the SM7B with a built-in preamp, switchable between +18 and +28 dB, which also runs on 48 V phantom. Cloud says on its CL-1 page that it licensed its technology to Shure for this mic. If you have not bought the SM7B yet, this removes the whole question.

On a tight budget, the cheapest booster that fits your mic is usually the right one. They all do the same job, clean gain ahead of the interface, so the decision that matters is booster or no booster, not which brand.

Shure SM7B and Cloudlifter: the pairing everyone asks about

The SM7B is the reason "sm7b cloudlifter" is a search at all. It is a low-output dynamic mic, and Shure's own -69 dBV figure explains why entry-level interfaces struggle with it. If you already own one, run the table above against your interface. Below 60 dB of gain, a booster or a new interface is close to mandatory. At 60 to 65 dB it depends on how close you sit and how much hiss your interface makes near the top. Above 65 dB you can probably skip it and just move closer.

If you have not bought the mic yet, read Is the Shure SM7B worth it for a home setup? first. The price of the SM7B plus a booster plus an interface strong enough for it adds up, and for calls in an ordinary room a cheaper dynamic mic close to the mouth often gets you most of the way. Is a dynamic mic really better for podcasting in a normal room? explains why the mic type matters less than the distance.

The chain, wired correctly

Shure SM7B
  -> XLR cable
Cloudlifter CL-1 or FetHead (right after the mic)
  -> XLR cable
Interface input 1, 48V phantom ON
  -> USB
Mac: Sound settings, Input = the interface
Gain: start at minimum, raise until loud speech peaks near -12 dBFS
Mouth to mic: 5 to 8 cm (2 to 3 inches), slightly off-axis

Two checks after wiring: speak at your normal call volume and see where the gain knob ends up. If it lands in the lower half of its range and the pauses are quiet, the booster is doing its job. If you are still near the top, check that phantom power is on and that nothing else in the chain, such as a cheap XLR-to-USB adapter, is limiting the gain. Can you plug an XLR mic into a Mac with a USB adapter? explains why some of those adapters are the actual bottleneck.

Where TunedMic fits, and where it does not

TunedMic is a Mac app that adds a virtual microphone tuned to your voice. It works after the interface, on the digital signal, so everything in the "software gain" section applies to it too: it does not replace a Cloudlifter when the problem is analog hiss from an interface pushed too hard.

It fits the other half of the cases, the ones where the ten-second test points away from hardware: a clean but quiet signal that call apps still treat as weak, a room you cannot change with a fan or a street outside, or a mic that is fine on paper but comes across flat or boomy on calls. During its one-minute Sound Check, TunedMic takes more than 30 measurements of your voice, your mic and your room, then builds profiles from them. Its controls cover noise, room echo, clarity, loudness and a 12-band EQ, and the processed voice goes to Zoom, Meet, Teams, Discord or OBS through one mic you pick in each app. It reduces noise rather than removing all of it, and it will not make an entry-level mic sound like an SM7B.

Its limits are firm. It needs a Mac with Apple silicon (M1 or newer) and macOS 14 or later, with no Intel or Windows version. It costs $19 once (details on pricing). The free 7-day trial starts at first launch, with every feature working and no card or account, and there are no refunds after purchase, so the trial is the time to decide.

Before you spend $129

Do the ten-second test tonight. Record silence with the mic unplugged, then with it plugged in, at the gain you actually use. If the two clips hiss the same, buy the cheapest inline booster that fits your mic, or an interface with 65 dB or more of gain. If the plugged-in clip is louder, keep the money, move the mic closer and deal with the room. If you are on an Apple silicon Mac and want to hear what software can do with an ordinary setup, the 38-second video on the home page shows the one-minute Sound Check that setup starts with. Then run that Sound Check on your own mic during the free 7-day trial and compare the result with your two test clips.