MFJ-654 Equaliser & Conditioner is designed specifically for voice applications, featuring an 8-band equalizer/conditioner with frequencies ranging from 50Hz to 3200Hz. Despite lacking a VU meter, it includes a downward expansion noise gate for enhanced audio quality. The device offers selectable 600, 200 Ohm, and Hi-Z mic inputs, accommodating dynamic, electret, crystal/ceramic mics, and 8-pin round, modular, or Heil boom-mic headset connections. Additionally, it provides headphone monitoring, PTT functionality, and auxiliary-in and is RF-proof, all within a compact size of 273 x 83 x 127mm.

MFJ's Audio Equaliser/Conditioners, exemplified by the MFJ-654, introduce professional audio capabilities to ham radio equipment. These devices are well-suited for transmitting and receiving audio, ensuring clear and crisp sound quality. They are compatible with various 8-pin and modular microphones and Heil audio products, with the option of utilizing pre-wired cables for convenience. MFJ's commitment to audio excellence is evident in the functionality and versatility of their Equaliser/Conditioners.

In conclusion, the MFJ-654 Equaliser & Conditioner stands out as a high-quality audio solution for voice applications. Its comprehensive 8-band equalizer, noise gate, and versatile mic input options cater to amateur radio enthusiasts' and professionals' needs. Including headphone monitoring, PTT support, auxiliary-in, and RF protection further enhances its usability, making it a valuable addition to any audio setup requiring precise control and exceptional performance.