Cloudlifter or FetHead for an SM7B: what do the 2 dB change?
On a Scarlett Solo 3rd Gen both boosters solve the problem and the difference between them is two decibels — inaudible as a verdict. What separates them in our data is not gain at all: one manufacturer documents what happens to phantom power, the other does not.
Signal Chain Compatibility Matrix
Select gear and parameters for live gain, impedance and SPL calculations.
Input Equipment Setup
PASS: Optimal Signal Chain
Requires minimum +60dB of clean pre-amp gain. Most budget entry interfaces max out at +50dB to +56dB and introduce hiss at max pot. An inline preamp booster (Cloudlifter CL-1 / FetHead) is strongly recommended.
The interface preamp provides sufficient headroom.
$538
$405
-25%Tonal & acoustic characteristics: Flat, wide-range frequency response for clean music and speech. Smooth, warm acoustic character with air-suspension shock isolation.
Technical advisory: With +69dB max gain, the Gen 4 Solo can drive demanding dynamics like the Shure SM7B natively without requiring an external inline booster.
Physical Interconnect Topology
Shure SM7B
Direct Cable Connection (No Intermediate Box)
1x Shielded Balanced XLR Cable (3-Pin XLR Male to XLR Female)
Focusrite Scarlett Solo (Gen 4)
Host: Apple MacBook Pro (M1/M2/M3/M4)
Both work. The FetHead leaves 26 dB of interface gain unused, the Cloudlifter CL-1 leaves 24.
The arithmetic. On its own, the SM7B on a Scarlett Solo 3rd Gen needs 57 dB and the card publishes 56: one decibel short, which is why this is the pair that invented the rule «the SM7B needs a booster». Add a booster and the interface only has to supply the remainder:
| Chain | Booster gain | Left for the card | Card has | Margin | Price | |---|---|---|---|---|---| | bare | — | 57 dB | 56 dB | −1 dB | — | | + FetHead | +27 dB | 30 dB | 56 dB | +26 dB | $99 | | + Cloudlifter CL-1 | +25 dB | 32 dB | 56 dB | +24 dB | $129 | | + Klark Teknik CT 1 | +25 dB | 32 dB | 56 dB | +24 dB | $45 |
At 75 dB SPL — a quiet voice — the bare card is 11 dB short, the FetHead chain still needs only 40 dB and the Cloudlifter chain 42. Both are comfortable; neither is different from the other in any way a listener could name.
What actually separates them. Triton Audio publishes that the FetHead does not pass phantom power through to the microphone, and our catalogue records that as a field. Cloud Microphones states the same thing on its own page — «Does not pass phantom power, protecting ribbon and tube mics» — but our entry for the CL-1 has the field empty, so the calculator raises the phantom pass-through unknown flag on the Cloudlifter chain and stays silent on the FetHead one. Same physical behaviour, different confidence, and the site shows the difference instead of hiding it.
The pearl. For a dynamic microphone that flag costs nothing — the SM7B needs no phantom of its own. Put a condenser in front of either box and the same 25 dB becomes fatal: the booster eats the 48 V and passes none on, so the microphone goes silent no matter how much power the interface supplies. Choosing between boosters on the 2 dB of gain is choosing on the one number that does not matter; the number that does is what the box does with the phantom rail.