Abstract: A method for calibrating an in-wall speaker includes determining a resonant frequency of speaker when the speaker is installed in a wall and using the resonant frequency to apply an equalization to the speaker to match a designed reference response. The method may be implemented by a device, such as an audio component, a wireless mobile device, or both.

Abstract: A standby circuit generates a control signal for configuring a main power supply circuit to operate in one of a full operation mode and a standby operation mode. The standby circuit includes a standby power supply block and a control block. The standby power supply block produces a power supply signal for powering the control block. The control block receives a mode control signal that indicates the operation mode and automatically generates a coupling signal based on the mode indicated by the mode control signal. The control signal is based on the coupling signal.