Product Description: LC Passive Bandpass Filter Anti Interference 4 in 1 Wavefilter for Radio Receiver Application: This versatile passive LC filter is designed for use with a wide range of popular receivers, radios, SDRs, and other devices. Its broad application scope makes it an essential tool for enhancing both personal and professional audio experiences, providing convenience and improved performance in various settings. Multi Band: The filter is expertly divided into four distinct bands to cater to different frequency needs. The P1 filter covers 0.5‑1.5MHz, ideal for medium wave radio listening. The P2 filter spans 4.5‑12MHz, perfect for short distance low band and 40 meters amateur band. The P3 filter handles 12‑30MHz, suitable for short distance high band, and 20 meters, 40 meters amateur bands. Finally, the P4 filter is dedicated to FM broadcasting frequencies of 88‑108MHz, ensuring comprehensive coverage for diverse listening preferences. Pre Filter Function: Enhance your SDRs, radios, and receivers with the pre filter function provided by this passive LC filter. When used with a quarter active splitter, it offers significant improvements in signal clarity and reception quality, making it an invaluable addition to any audio setup. Premium Material: Constructed from high-quality alloy steel, this filter boasts exceptional strength, toughness, and abrasion resistance. It is designed to withstand high and low temperatures and is non-magnetic, ensuring durability and reliability in various environmental conditions. Anti Interference Function: This filter effectively compensates for the lack of pre filter design in all-metal aluminum shell radios. It reduces interference from short and medium wave FM broadcasting and other frequency bands, enabling multi-channel, multi-frequency reception. Enjoy clearer, more reliable audio with reduced noise and enhanced signal quality. Upgrade your audio experience with the LC Passive Bandpass Filter, designed to deliver superior performance and versatility for all your radio and receiver needs.