beyerdynamic DT 990 PRO Headphones ❌ Sound Blaster x3 Audio Interface - For Sale Thank you for viewing. This is a listing for the beyerdynamic DT 990 PRO, a classic studio monitor headphone from the German audio manufacturer beyerdynamic. It features a spacious soundstage unique to open-back headphones, with clear high frequencies and rich low frequencies, and is highly regarded by users worldwide for music production and listening. It uses velour ear pads for comfortable wear even during long listening sessions. A compact audio interface with audio balance adjustment and direct mode functions. - Brand: Sound Blaster - Model: Audio Interface - Functions: Audio balance adjustment, direct mode, line output - Connectors: Microphone input, line output