audioengine a2+ plus wireless speaker bluetooth | desktop monitor speakers | home music system aptx bluetooth, 60w powered bookshelf stereo speakers | aux audio, usb, rca inputs,16-bit dac (black) audioengine the award-winning audioengine a2+ powered speaker is a perfect example of the extension of this mission. with music streaming services and digital music players becoming the centre of the modern music system, consumers have had to accept a loss of the premium components resulting in the loss of sound quality. with a built-in digital-to-analog converter (dac), the audioengine 2+ allows you to send high-quality digital audio direct from your computer or other listening device’s usb or aux port. we’ve also added a variable rca output to connect a subwoofer and you can even go wireless with the optional audioengine b1 bluetooth adapter. the audioengine 2+ is a great introduction to high-quality audio and the perfect upgrade for your computer, turntable, tv, or favorite streaming device.