It will likely change the sound of your speakers--every Harmonix product I have tried will do that. Whether it's for the better or not is up to your ears, so I would insist on a home trial. Considering YG Acoustics' claims to be the best and most accurate speakers on Earth, I think they would disagree with your using these footers, and it does seem a little unusual that you would want to change the sound of the world's most accurate speakers. But hey, what do I know?
