The Edifier R1280DBs active Bluetooth bookshelf speakers have been upgraded to include a sub-out feature with automatic detection and built-in crossover. The unique feature of a Sound field Spatializer simulates a larger soundstage with the touch of a button. This feature allows these near-field monitors to produce a panoramic sound stage. Connect the speaker wirelessly to your phone, tablet and laptop using the latest Bluetooth technology. Qualcomm Bluetooth V5.0 for stable wireless connection.