This Pioneer SA-940 stereo amplifier is a top-of-the-line piece of equipment that has been thoroughly tested and is ready to be put to use. With its non-switching amplifier technology, it delivers a clean and powerful sound that will enhance your listening experience. Made in Japan, this amplifier is a true testament to Pioneer's commitment to quality and craftsmanship. The SA-940 is designed for use with a variety of audio devices and has been refined to meet the needs of even the most discerning audiophiles. Whether you're a music lover or a sound engineer, this amplifier is sure to impress.