Excellent Audio Units The 2.75" mid-low drivers, featuring aluminum alloy diaphragms and designed for extended range, produce bass frequencies as low as 55Hz while ensuring rich and full-bodied midrange tones. Our finely-tuned 1.25" silk diaphragm dome tweeters deliver precise high-frequency reproduction, resulting in crisp and bright treble notes. Crafted Acoustic Excellence The QR65 speakers feature an MDF enclosure, an independent acoustic cavity, and include patented MazeTube Bass Reflex Channels and TurbMuff Air Noise Suppression Technology. These innovations work together to minimize port noises and reduce acoustic resonance to their absolute minimum levels. High-Resolution Audio The audio system supports high-quality audio up to 24bit/96kHz. It uses dual Tl Class-D digital audio amplifiers to separately amplify high and mid-low frequencies and manage DRC. The speaker has USB-A and RCA inputs for high-quality audio signals, and it also supports lossless audio streaming at 24bit/96kHz through Bluetooth V5.3 with LDAC technology. Certified for Hi-Res audio and Hi-Res audio wireless quality.