Key benefits — why you need this device Clearer audio from weak or noisy amateur and shortwave signals by reducing background noise with digital signal processing (DNR Audio). Faster, more usable reception: selectable noise reduction levels and digital filters let you focus on voice or narrow signals without retuning hardware. Flexible output options: builtin speaker plus ability to drive external speakers and amplifiers for better sound on older equipment. How it solves common problems Removes hiss and static that mask voice and SSB communications, improving intelligibility on crowded bands. Lets you match filter bandwidth to the signal using digital filter choices, reducing adjacentchannel interference and background noise. Works with existing receivers via a standard 3.5mm input so you can add noise reduction without modifying your radio. Key features and attributes DNR Audio (digital signal processing): reduces background noise in amateur signals for clearer audio from shortwave stations. Noise reduction filter with 3.5mm input interface: processes incoming audio and offers selectable noise reduction levels when used with receivers. Audio spectrum / digital filters: 10 digital filter options, including 200Hz, 500Hz, 700Hz, 1kHz, .8kHz, 2kHz, 2.4kHz, 3.5kHz, and 6kHz lowpass filters, allowing flexible matching of FLT and DNR functions for optimized sound output. Digital Filter SSB support: designed for singlesideband operation and improved voice clarity. Power and outputs: upgraded TypeC power input supports continuous operation; onboard speaker or external speaker/amplifier connections enable improved audio performance with older equipment. Compatibility and usage Interfaces: connects to receivers and audio sources via 3.5mm input; powered by TypeC. Outputs: builtin speaker plus external speaker/amplifier connection for larger listening setups. Intended for use with shortwave and amateur radio receivers, SSB communications, and any audio chain where noise reduction and selectable filtering improve intelligibility. Practical use scenarios Home shortwave listening: connect your receiver to the 3.5mm input to reduce static and hear weak longdistance stations more clearly. Amateur radio stations: use selectable DNR and digital filters during SSB contacts to cut background noise and improve transmit/receive monitoring. Upgrading legacy equipment: add the unit between older receivers and external speakers or amplifiers to modernize audio performance without replacing the radio. What stands out DSPdriven noise reduction combined with multiple digital filter options gives precise control over audio clarity. Simple integration via 3.5mm input and TypeC power makes it compatible with many receivers and speaker setups. Builtin speaker plus external output options deliver immediate improvement for both listening and station monitoring.