To reduce Latency some televisions, including HDTV (High Definition) and AV amplifiers can cause an audio delay, called latency. This latency causes a delay between what you sing and the sound from the speakers. If the offset is too large, it is advisable to reduce the volume of the voice. To reduce latency, set the TV / AV amplifier to GAME mode.
For more information, consult the manufacturer‘s manual of the device. To further reduce latency, directly connect the console to a Hi-Fi-Device.