Just some technical OT,
The sound is probably not good because of location where the sound is recorded at, and failure to use the right mic for the right application. Also, on youtube, most sound is compressed (from an already compressed format when it is uploaded), hence a major loss in quality and definition.
Also, feedback and echo are different. Feedback is also known as signal loop, and echo is, well, echo. Do note that feedback can occur as a result of echo as well, if a mic input's gain is set too high, and it picks up the echo, which would count as a signal loop.