Fill any room with amazing stereo sound. The HD4 Next Gen can connect either wired or wirelessly, so you can play your music from your computer, phone, tablet, even your turntable or cassette player. Use any music app or device you like. The HD4 Next Gen also has a headphone amplifier, so you can listen to your music privately with crystal clear sound. Pro Tip Connect your HD4 Next Gen to a desktop via Bluetooth or Usb for improved audio. This connection bypasses the lower quality audio parts in your computer, allowing the HD4 Next Gens built-in Dac to refine the sound.