Abstract: An in-ear earphone for providing high fidelity sound to the ear and having a housing with a receiver bay, at least one speaker positioned in the receiver bay, a flexible acoustical seal configured for insertion into the user's ear canal, a removable treble stem having a stepped opening therethrough configured for receipt of a filter for treble adjustment and positioned on one side of the receiver bay between the receiver bay and the acoustical seal, a cavity on the opposed side of the receiver bay remote from the stem that is configured for receiving removable plugs for bass adjustment, a strengthening and stabilizing member adapted for securing the housing around the speaker and which when optionally removable allows easy access to the speaker within the receiver bay, and a removable coaxial cable connector positioned to communicate with the receiver bay and which allows movable cable connection for user comfort.