Mic Booster CM-1
intermediate
$39
Used market: $30*
Specifications
3 of 7 values have a recorded source- Type
- inline_booster·
- Added Gain dB
- 25✓
- Input Connector
- 3-Pin XLR Female (7 kΩ)·
- Output Connector
- 3-Pin XLR Male (2 kΩ)·
- Expert Description
- En: In-line booster for passive dynamic and ribbon microphones: +25 dB into a 10 kΩ load, input impedance 7 kΩ, maximum input level -15 dBu, maximum output +10 dBu into 10 kΩ, response 10 Hz to 20 kHz ±1 dB, THD+N below 0.02% at 1 kHz. Runs on 48 V phantom and needs no other supply. · Uk: Вбудовуваний бустер для пасивних динамічних і стрічкових мікрофонів: +25 дБ на навантаженні 10 кΩ, вхідний опір 7 кΩ, максимальний вхідний рівень -15 dBu, максимальний вихід +10 dBu на 10 кΩ, смуга 10 Гц – 20 кГц ±1 дБ, спотворення менше 0,02% на 1 кГц. Живиться від 48 В фантомного, іншого джерела не потребує.·
- Provides Phantom Power
- no✓
- Requires Phantom Power
- yes✓
Expert Audio Engineering Commentary
Gain Staging Advice
Maximum input is -15 dBu. That is a booster for quiet microphones and nothing else: put it in front of a loud source and the box itself clips before the preamp behind it ever does.
Production Warning
Klark Teknik's Quick Start Guide states it in the setup procedure: "phantom power cannot be passed to condenser mics, and therefore they shouldn't be used along with a mic booster unit." This is the same document that covers the CT 1 already in the catalogue.
What the datasheet actually says
Quoted verbatim from the manufacturer’s own page, with the date we checked it. We state what is printed, not what anyone intended by it.
««Specifications — CT 1 | CM-1 | CM-2 … Impedance 7 kΩ … Maximum input level -15 dBu … Maximum gain +25 dB, 10 kΩ load … Power requirements 48 V phantom» (усі значення в одній колонці на три моделі)»
One Quick Start Guide serves the CT 1, CM-1 and CM-2. The table has three model columns, but every electrical figure — impedance, maximum input, gain, output level, noise — is printed once across all three; only the connector count, dimensions and weight differ per model. The CT 1 is a much smaller unit built to sit directly on a microphone, so a reader has no way to tell from this document which figures were actually measured on which box.
checked 8/5/2026««EIN noise @ +25 dB gain: >120 dB, 22 Hz-22 kHz, unweighted»»
Equivalent input noise is a negative level referred to a stated reference, normally written as something like -120 dBu. Here it is printed as a positive number, with no reference unit and with a "greater than" sign, so as written a larger value would mean more noise while the sense intended is clearly the opposite. The figure cannot be compared with an EIN in dBu from another manufacturer.
checked 8/5/2026* Estimated with the depreciation fallback (~77% retained value). · checked on 8/5/2026