I owned three PJB units, but I'm selling them to organize my equipment. I acquired them used, but they only have a few minor scratches, and there's no crackling in the knobs. There are no issues with functionality or sound quality. 【Astonishingly Compact Speakers That Defy Convention】 Traditionally, it's been thought that bass speakers should have large diameters. Large-diameter speakers = deep bass. This seems correct on the surface, but large-diameter speakers have the drawbacks of being slow to respond and susceptible to distortion. PJB speaker cabinets use many small-diameter speakers to create a surface area equal to or greater than that of large-diameter speakers, reproducing rich bass. Furthermore, the excellent mid- and high-frequency reproduction capabilities unique to small-diameter speakers reproduce even overtones that were previously inaudible. The responsiveness is also noteworthy, with astonishing responsiveness and a sense of speed that accurately reproduces the player's feel, sense, and technique. In long-term use, the load is distributed across individual speakers, making them more durable than large-diameter speakers and increasing overall reliability. 【High-Quality Sound】 PHIL JONES BASS delivers power that you wouldn't expect from its compact size. The clear and rich sound quality conveys the various nuances of the bass player. 【Compact Design】 It's a compact size that's easy to carry around and can be used anywhere. 【Multi-Function Control】 Multiple control knobs allow for fine-tuning of the sound quality and can accommodate various styles. - Brand: PJB - Color: Red - Number of Speakers: 2 - Model Name: PHIL JONES BASS DOUBLE FOUR BG-75 - Power Adapter: Included Please note that this item is also listed on other sites, so it may be sold out. Thank you for viewing.