I only used these a few times at home. These are similar to the over-ear Custom One Pros in that they have a bass slider mechanism and the decorative faceplate inserts, but are smaller. If the slider switch on the earcups is closed, half open, or fully open, you can adjust the bass level. This is the same as the Custom Street but the "i" may have been to indicate the cable was meant to be compatible with Apple iPods and iPhones (back when they still had headphone jacks).

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