Experience high-quality sound with the Acoustic Research M4 Holographic Imaging Speakers. These vintage speakers have been fully tested and are in great working order. With a brand name you can trust and a model that is well-known for its superior sound quality, these speakers are sure to impress any audiophile. The M4 model is designed to provide a realistic and immersive sound experience. These speakers are perfect for vintage audio and video enthusiasts who want to add a touch of nostalgia to their collection. With their unique holographic imaging technology, the Acoustic Research M4 speakers are a must-have for anyone who wants to enjoy high-quality sound in a vintage format.