Amazing Studio Quality Sound. Leave No Note Unheard. Bluetooth v4, aptX for High Quality Audio Streaming. Frequency Response: 20Hz ~ 20kHz. Low Noise and Distortion. 2 x 12AX7 Electron Amplifier Tubes. 1 x 6E2 Magic Eye VU Tube. Audio Inputs: Aux-in x 2 (RCA Jacks) or Bluetooth. Hi-Fi 2-Way Bass Reflex Stereo Speaker System with Removal Fabric Mesh. Output: 2 x17W RMS.