The Auto Set-Up/Room EQ Adjust feature eases setup hassles by confirming speaker phase, assessing the sizes of all of your speakers, measuring speaker-to-listener distances, and balancing speaker levels. With the Denon DM-S205 or DM-S305 calibration-grade microphone (some optional) placed in your favorite listening seat, this feature uses a test tone generator and proprietary programming to precisely balance speaker levels and fine-tune the delay and EQ settings for each speaker. The result is optimized system performance for your specific home theater room.