The Polsen two-channel inline microphone signal booster adds 25 dB of clean, transparent gain to low-output passive dynamic and ribbon microphones before their signals reach a mixer, microphone preamp, or audio interface. It helps users capture quiet voices and instruments without relying as heavily on noisy high-gain preamp settings.

The booster draws its operating power from a compatible device supplying 48 V phantom power. Phantom power is not passed through to the connected microphones, helping protect sensitive passive ribbon microphones. Battery-powered and externally powered microphones can also be used. Condenser microphones requiring phantom power through their XLR connection need an external phantom power supply.

• Two independent microphone-level channels accommodate paired, stereo, interview, podcast, broadcast, studio, and live-sound setups.
• Two balanced 3-pin XLR female inputs and two balanced 3-pin XLR male outputs provide clean connections for professional audio equipment.
• Locking XLR connectors resist accidental disconnection caused by cable strain, stage movement, or equipment handling.
• A 10 Hz to 20 kHz frequency response with ±1 dB variation supports accurate full-range audio reproduction.
• Total harmonic distortion plus noise measures less than 0.02% at 1 kHz and 0 dBu for clean signal amplification.
• Shielded circuitry and balanced connections help reduce unwanted noise and interference during long XLR cable runs.
• The compact steel housing withstands transport, studio work, touring, stage use, office recording, and home production environments.
• No controls or indicators are required, providing straightforward inline operation.

For setup, mute or lower the receiving channel, connect balanced XLR cables from the booster outputs to the mixer, preamp, or audio interface, connect the microphones to the inputs, enable 48 V phantom power on the receiving device, and gradually increase the receiving gain.