I think the reason that it changes and ruins the sound so much is due to the size of them, when wearing these your ears are at a greater distance from the earphone than they normally would be with the defaults, so the high and low increase isnt as effective and instead makes the mix muddy. These shoes were very comfortable for the first week or so and then they began to lose all their cushion. Typical Chinese made garbage that seems to be what Amazon is going to. Big disappointment though as purchased because description states 6ft. It is really great for walking as very comfortable. I could be wrong but wasnt taking chances. Strong, easy to install My. but the Duet Mini sounds great for the price. I usually wear a 9 in flip flops but 9.