Airpulse A80 active bookshelf speaker system is a perfect combination of uniquely designed conventional loudspeakers and digital systems of XMOS. It supports Hi-Res high-quality audio playback and has obtained a Hi-Res official certification. They are housed in an 18-mm thick high-strength MDF cabinet with beautiful walnut finish. Premium Sound at a Great Value Airpulse A80 Hi-Res Active Speaker System Ribbon tweeters & 4.5" mid-woofer The meticulously formulated horn shape produces directional and optimized high frequencies from the ribbon tweeter, so they are aimed at the listeners, minimizing unwanted effect from room reflection. Designed from the ground up by Phil Jones All technical and design aspects of the A80 were personally crafted by Phil Jones, to reflect our commitment to providing exceptional audio quality. Built-in amp with subwoofer output The system reserves a subwoofer signal output in case of a situation that needs low-frequency rendering with strong bass. Listen to audio from any source with its multiple inputs, including AUX, PC, USB, Optical, and Bluetooth.Hi-res audio certified Horn loaded ribbon tweeter 4.5 inch aluminum cone 30mm voice coil mid-woofer Digtal amplifer with Xmos processor / subwoofer output Input Mode: AUX, PC, USB, Optical, Bluetooth 5.0 with AptX INPUT SENSITIVITY: AUX:450±50mV PC:550±50mV, USB:400±50mFFs BLUETOOTH PROFILE: 500±50mFFs Optical : 400±50mFFs SUB OUT: 1200mV Max MAINS VOLTAGE: AC 100-240 V /50-60 Hz SIGNAL-TO-NOISE RATIO: L/R:?90dB(A) CABINET SIZE: 140x250x220mm NET WEIGHT: 9.3 Kg(20lbs) /pair