Polsen's four-channel inline XLR microphone signal booster adds 25 dB of clean, transparent gain before microphone signals reach a mixing board, microphone preamplifier, or audio interface. It is designed for low-output passive dynamic and ribbon microphones and can also be used with battery-powered microphones, self-powered microphones, and externally powered condenser microphones.

• Four-channel gain: Four independent channels provide a fixed 25 dB signal boost, helping improve signal-to-noise performance without excessive noise or unwanted tonal coloring.
• Balanced XLR connectivity: Four balanced 3-pin XLR female microphone inputs and four balanced 3-pin XLR male outputs provide clean connections for professional audio systems.
• Locking connectors: The locking XLR connections resist accidental disconnection caused by cable pulls or strain during studio recording, touring, broadcast work, and live performances.
• Phantom-powered operation: The booster draws operating power from a compatible mixer, preamplifier, or audio interface and does not require a separate power adapter.
• Ribbon microphone protection: Phantom power is not passed through to the connected microphone, making the booster safe for sensitive passive ribbon microphones. Condenser microphones that require phantom power at the microphone need a separate external phantom-power supply.
• Long cable applications: Balanced, shielded connections help reduce interference when microphone cables pass near lighting equipment, electrical systems, or run long distances to a mixing position.
• Rackmount construction: The rugged steel enclosure fits a standard 19-inch equipment rack and is designed to withstand transportation, stage work, studio sessions, and other demanding professional applications.
• Simple operation: The unit has no onboard controls or indicators. Connect the microphones and audio equipment with balanced XLR cables, activate phantom power, and adjust gain at the mixer, preamplifier, or interface.