The RX-DP9VBK is a THX select certified receiver, which has 5 independent amplifiers built in along with 7.1 output so you can take full advantage of the THX surround EX decoder. The zero interference technology eliminates any interference within the receiver to produce exceptional sound quality. The built-in headphone virtual surround system is compatible with multichannel software like Dolby Digital, DTS Surround, etc. Thanks to the new signal processing algorithms used by the high-performance DSP, you can enjoy a natural surround sound through the headphones. ??To improve CD and DVD sound reproduction the RX-DP9VBK uses a CC (Compensative Compression) Converter and a 192kHz/24-bit PEM DD audio DA Converter to recreate the sound as it was originally intended. This receiver is packed with features, which makes it a world-class receiver.