Polk Audio Powered Subwoofer Home Theater Sub Black Active Sub B

Polk Audio powered subwoofer in good working condition. Strong deep bass output suitable for home theater systems, music setups, and stereo receivers. Solid MDF cabinet design with front-firing driver and rear bass ports for enhanced low-frequency performance. Features adjustable volume control, low-pass crossover, phase switch, auto on/off power mode, and multiple connection options including RCA line-in and speaker level inputs/outputs. Compatible with most AV receivers and stereo systems with subwoofer or LFE output. Scratches on the top surface, but they don't affect the sound.