The Acoustic Research HC4 set of 4 speakers are rectangular, black bookshelf speakers with a wired connectivity and impedance of 8 Ohms. These speakers are designed for home audio systems and offer a high-quality sound performance for an immersive listening experience. Perfect for adding a touch of elegance and sophistication to any living space, these speakers from Acoustic Research are a reliable choice for those seeking a premium audio solution. Sound great in good condition.