My microphone is connected to the 205G USB player using MIC 1 or MIC 2 jack in the front panel. The AV output of the 205G USB player is connected to a TV using HDMI or RCA outputs. But when I am singing into the microphone, the singing voice is coming out with a delay. The Echo is turned down to zero using the remote control of the 205G USB player.
The cause is your AV connection. Instead of connecting audio directly from the 205G USB player to the receiver or speakers, you are connecting the AV output of the 205G USB player to the TV first using HDMI or RCA, and then taking the sound out from the TV to the receiver or audio system. Even the latest and greatest TVs in the world takes a split second to in-take the AV signal, process it, and then output the audio.
So, if your receiver or audio system takes in only the RCA input, connect the 205G USB RCA audio output (red and white RCA outputs) to the receiver or audio system directly. If your receiver or audio receiver takes in the HDMI input, connect the HDMI output of the 205G USB player first into the receiver and let the receiver split the video portion which you can then connect to the TV, and let the audio portion go out to the speakers.
If you are using the built-in speakers in the TV only, not a separate receiver or audio system, you can connect the HDMI or RCA output of the 205G USB player directly into the TV. But if you using a separate receiver or audio system with speakers that is not built-in to the TV, always go directly from the 205G USB player output to the receiver or audio system first.