Yes donut foams will alter the sound. In my experience they will make the sound more v-shaped and open, improve clarity. Generally they push back mids and give more presence to bass and highs. But you have to test it out, everyone's ears are different.The colors don't matter usually, but the density and thickness do. To compare density, hold two foams in front of a white computer screen for example, you'll see how much light they let through. I'd describe the B40 stock foams as average thickness, quite dense. With less dense foam you'll get crispier more open sound with less but tighter bass. Thickness will improve seal, thus increase bass and warm up lower mids. A lack of good seal can make the sound thin and harsh, even if you feel the fit is ok. If you push the buds slightly in your ears, and notice a big difference, then you would benefit from thicker foam.Just to check, do donut foams and normal foams make a difference to sound? And between the black, grey and blue foams, are there any differences to sound, or it is just asthetics?
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