Speaker Edifier R2750DB

3-way powered bookshelf speakers
Bluetooth V4.1 with CSR technology
Sub-out for an independent subwoofer
Calibrated bass reflect port in front of the speaker cabinet
F5 pin bi-amplifying XLR type speaker cable with angle connectors 3
Class D amplifier system with Digital Signal Processing and electronic tone control technology

Product pdf: http://www.dot-media.gr/pdfProduct/010185.pdf