HamiltonBuhl PA-25W 25W UHF voice amplifier accessory

Portable UHF voice amplifier for presenters

The HamiltonBuhl PA-25W is a personal voice amplifier designed for teachers, tour guides and event speakers who need to project their voice across large areas without strain. It delivers up to 25W of clear audio output through a lightweight, wearable main unit and a wireless UHF headworn microphone. Bluetooth connectivity allows streaming of music or backing tracks from a paired device.

Check power source and microphone fit before use

The amplifier runs on an internal 3.7V 550mA polymer battery that recharges via USB, so verify you have a suitable charging port or adapter available. Ensure the wireless headworn microphone sits securely and comfortably for the intended wearer, and confirm the UHF frequency is clear in your venue to avoid interference. The top-mounted dial controls volume, recording and playback functions.

Sustained output depends on battery management

During extended sessions the 25W output is maintained until the polymer battery depletes, after which the unit must be recharged before further use. Heat buildup in the compact chassis is managed passively, so continuous high-volume operation in warm environments may reduce available runtime. Recording and Bluetooth streaming draw additional current, shortening the interval between charges.