Full Description
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Give quieter microphones more gain
Low-output microphones can benefit from extra level before their signal reaches the rest of your audio setup. The SubZero Microphone Booster provides up to 25dB of gain, helping you increase that signal at the start of the chain. This makes it suited to both stage and studio applications where your microphone needs an additional boost. With a maximum output level of +10dBu into a 10kΩ load, it provides a straightforward way to add gain between your microphone and compatible audio equipment.
Power it straight from your setup
The active circuit requires 48V phantom power, supplied through compatible equipment connected to the booster's output. That means you can use the phantom power available from a suitable mixing desk, soundcard, or other device rather than adding a separate power supply. Your microphone connects to the MIC IN socket, while the OUTPUT routes the boosted signal onwards. Both connections use balanced XLR sockets, keeping the signal path simple and familiar for stage and recording setups.
Maintain a wide frequency range
A 10Hz to 20kHz frequency response, measured within ±1dB, allows the booster to handle a broad frequency range. Its THD + N specification is below 0.02% at 1kHz and 0dBu, while the EIN noise specification at +25dB gain is greater than 120dB across 22Hz to 22kHz, unweighted. These specifications give you clear information about how the booster performs when adding level, helping you make an informed choice when matching it with your microphone and the rest of your signal chain.
Slot it easily into your signal chain
At 120mm x 47mm x 48mm and weighing 0.143kg, the booster adds little bulk to a stage or studio setup. The balanced XLR input has a 7kΩ impedance and accepts a maximum input level of -15dBu, while the balanced output has a 2kΩ impedance. Setup is simple: connect a compatible microphone to the input, connect the output to equipment capable of supplying 48V phantom power, and the booster provides the additional gain.
Specifications
Input
- Connector: 1 X XLR, Balanced
- Impedance: 7 kΩ
- Maximum Input Level: -15 dBu
Output
- Connector: 1 X XLR, Balanced
- Impedance: 2 kΩ
- Maximum Gain: +25 dB, 10 kΩ Load
- Maximum Output Level: +10 dBu, 10 kΩ Load
System
- Frequency Response: 10 Hz To 20 kHz (±1 dB)
- THD + N: <0.02% @ 1 kHz, 0 dBu
- EIN Noise @ +25 dB Gain: >120 dB, 22 Hz–22 kHz, Unweighted
- Power Requirements: 48 V Phantom Power
Dimensions & Weight
- Dimensions: 120 mm X 47 mm X 48 mm
- Weight: 0.143 kg

The latest in music technology, for modern musicians and producers. SubZero combines innovation and quality, with the determination to help you get the sound you want. From studio and guitars, to powerful PA systems and home audio setups - SubZero is all about cutting-edge audio.