The SAE Mark 5000 Impulse Noise Reduction System is a vintage audio device designed to reduce noise interference in audio recordings. Manufactured by SAE, a trusted brand in audio equipment, this model utilizes impulse technology to effectively suppress unwanted noise and ensure high-quality sound capture. Perfect for use in recording studios or for audio enthusiasts looking to enhance the quality of their vintage audio equipment, the SAE Mark 5000 is a reliable and effective tool for achieving professional-grade audio recordings. Used gently. See pictures. Tested, working.