1. Dolby Digital Using advanced digital processing algorithms, Dolby Digital provides up to 5.1 channels of wide-range, high fidelity surround sound. Dolby Digital is the default digital audio delivery system for DVD and North American DTV. 2. Dolby Pro Logic IIx compatibility Dolby Pro Logic IIx furthers the matrix decording technology of Dolby Pro Logic II to decode audio signals recorded on two channels into up to 6.1 playback channels, including the surround back channel. The mode can be selected according to the source. The Music mode is best suited for playing music,the Cinema mode for playing movies, and the Game mode for playing games. The Game mode can only be used with 2-channel audio sources. 3. Dolby Pro Logic II Game mode compatibility In addition to the previously offered Music and Cinema modes, the AVR-1705/685 also offers a Game mode optimum for games. 4. DTS (Digital Theater Systems) DTS provides up to 5.1 channels of wide-range, high fidelity surround sound, from sources such as laser disc, DVD and specially-encoded music discs. 5. DTS-ES Extended Surround and DTS Neo:6 The AVR-1705/685 can be decoded with DTS-ES Extended Surround, a multi-channel format developed by Digital Theater Systems Inc. The AVR-1705/685 can be also decoded with DTS Neo:6, a surround mode allowing 6.1 channels playback of regular stereo sources. 6. DTS 96/24 compatibility The AVR-1705/685 can be decoded with sources recorded in DTS 96/24, a multi-channel digital signal format developed by Digital Theater Systems Inc. DTS 96/24 sources can be played in the multi-channel mode on the AVR-1705/685 with high sound quality of 96 kHz/24 bits or 88.2 kHz/24 bits. 7. Video Conversion Function The AVR-1705/685 is equipped with a function for up-converting video signals. Because of this, the AVR-1705/685’s MONITOR OUT jack can be connected to the monitor (TV) with a set of cables offering a higher quality connection, regardless of how the player and the AVR-1705/685’s video input jacks are connected. 8. Component Video Switching In addition to composite video and “S” video switching, the AVR- 1705/685 provides 3 sets of component video (Y, PB/CB, PR/CR) inputs, and one set of component video outputs to the television, for superior picture quality. 9. Auto Surround Mode This function stores the surround mode last used for an input signal in the memory and automatically sets that surround mode the next time that signal is input. 10.Front input terminal The unit is equipped with a Front Input connector for the convenient connection of a video camera or other equipment. 11.6CH EXT. IN jacks This unit is equipped with 6CH EXT. IN jacks for use with audio formats of the future. 12.Personal Memory Plus function Persinal Memory Plus is an advanced version of Personal Memory. With Personal Memory Plus, the set automatically memorizes the surround mode, channel volume, surround parameters, etc., for each of the separate input sources. 13.Preset Memory Tuning 56-Station AM/FM Random Preset Memory tuning.