How about a class D Headphone Amplifier?

    Class D headphone amplifiers have been around for many years. Their application mainly centers on the characteristics of earphones. The low EMI performance of class D amplifiers requires engineers to control the length of wires, the type of wires, and the load impedance of speakers. When the user connects any earphone to the standard earphone jack, all these controls are in vain. In fact, the earphone cable itself is a good antenna, and many portable devices use it as an FM receiving antenna.

     In a self powered headset, this is no problem. Many Bluetooth headsets have a full bridge class D amplifier to provide the best battery life. In such a system, the earphone cable will be very short, and the load impedance is also known.

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