24 | EnglishMenu systemIn Audio file sourceSupreme SettingWhen AAC, MP3 or WMA files encoded at a low bitrate (less than 96kbps (fs=44.1k, 48kHz)) are played,this function restores their high frequency regionto approach the sound quality of equivalents ofthese files encoded at a high bit rate. Processing isoptimized for the compression format used (AAC,MP3, or WMA), and adjustment is made for the bitrate used.Display Setting"SPRM ON" Plays sound using the Supreme function."SPRM OFF" Plays the original sound stored in the audio file.⁄• The sound effect may be imperceptible dependingon the relationship between the audio file format andsetting.• This function is not available on iPod.In FM receptionCRSC (Clean Reception System Circuit)Temporarily have reception alternate from stereo tomono to reduce multi-path noise when listening tothe FM station.Display Setting"CRSC ON" The CRSC is ON."CRSC OFF" The CRSC is OFF.⁄• Strong electrical fields (such as from power lines) maycause unstable sound quality when CRSC is turned ON.In such a situation, turn it OFF.In HD Radio modeReceive Mode SettingSets the receive mode.1 Select the Receive modePush the Control knob towards up or down.Select the "HDR MODE" display.2 Enter Receive modePress the Control knob for at least 1 second.3 Set the Receive modePush the Control knob towards up or down.Each time you push the knob, the Receive modealternates between the modes shown in the tablebelow.Receive mode Display OperationAuto mode "AUTO" Analog broadcasts and digitalbroadcasts will be switchedautomatically.When both are being transmitted,the digital broadcast will havepriority.Digital "DIGITAL" Digital broadcasts only.Analog "ANALOG" Analog broadcasts only.4 Exit Receive modePress the [MENU] button.⁄• Even if the Receive mode is set to "AUTO", when the Ballgame mode program (non-delayed broadcast program)is received, the Receive mode will automatically switchto Analog broadcast only.Function of KDC-X491Other than Standby mode/When the Dual Zone System is ONDual Zone System SettingSetting the Front channel and Rear channel soundin the Dual Zone System.Display Setting"ZONE2 R" Sub source (Auxiliary input source) is to be rearchannel."ZONE2 F" Sub source (Auxiliary input source) is to be frontchannel.