The following is from Roland's product description: (Manuals can be downloaded from Roland) * Professional-grade bass amplifier * Active speaker control for clear and tight sound reproduction * Selected components used. Furthermore, weight reduction has been achieved. Featuring a 15-inch speaker + tweeter configuration, it achieves a high output of 330W. This professional-spec bass amp is dedicated to sound quality, with a D-BASS custom speaker, a multi-AMP configuration with a dedicated power amplifier for each speaker, and the original COSM preamp. Equipped with Roland's unique FFP technology, which has evolved through active speaker control. It expands the low-frequency range and reproduces a clear and tight bass sound. ・Output Power 330W ・External Dimensions Width (W) 595 mm Depth (D) 415 mm Height (H) 670 mm (Photo) 8th photo. There are scratches on the corner guards.