An example implementation involves a first playback device receiving audio content to be played back by the first playback device and a second playback device in synchrony. Such audio content may include a first and second stereo component. The first playback device determines a limiting result that indicates frequencies at which a playback volume of the second playback device is limited and determines a crossover frequency based on the indicated frequencies at which the playback volume of the second playback device is limited. The first playback device causes the second playback device to play a first portion of the second stereo component that is above the determined crossover frequency and plays (i) the first stereo component and (ii) a second portion of the second stereo component that is below the indicated frequency in synchrony with playback of the first portion by the second playback device.

A piezoelectric vibration module includes a piezoelectric element, a wiring member connected to the piezoelectric element and drawn out to the outside, and an elastic plate bonded to one surface of the piezoelectric element, wherein the elastic plate is made of a silicone rubber.

An example implementation involves a first playback device receiving audio content to be played back by the first playback device and a second playback device in synchrony. The audio content includes a first stereo component to be played by the first playback device and a second stereo component to be played by the second playback device. The first playback device determines a first limiting result that represents playback of the second stereo component by a second playback device by applying, to the second stereo component, a pre-determined volume-limiting function that is associated with the second playback device. The first playback device determines another volume-limiting function based on the first limiting result and applies the determined volume-limiting function to the first stereo component when playing the first stereo component in synchrony with the playback of the second stereo component by the second playback device.

An example implementation involves a first playback device receiving audio content to be played back by the first playback device and a second playback device in synchrony. The audio content includes a first stereo component to be played by the first playback device and a second stereo component to be played by the second playback device. The first playback device determines a first limiting result that represents playback of the second stereo component by a second playback device by applying, to the second stereo component, a pre-determined volume-limiting function that is associated with the second playback device. The first playback device determines another volume-limiting function based on the first limiting result and applies the determined volume-limiting function to the first stereo component when playing the first stereo component in synchrony with the playback of the second stereo component by the second playback device.

The object of the present invention is that the surplus vibration involved therewith simultaneously generating a sound wave by the vibration of the vibrating cone of the loudspeaker unit is generated in the loudspeaker system, which has impaired the sound quality of the loudspeaker system. The purpose of the present invention is to provide a technique for improving the sound quality by reducing the this surplus vibration which are the loudspeaker frame vibration and the cabinet vibration like a front baffle vibration. The present invention is characterized in being configured with a viscoelastic material layer upon rear portions such as the frame surface of the loudspeaker unit and inside and outside surfaces of each surface configuring the loudspeaker cabinet, and additionally suppresses vibration by addition of a heavy member or pressurization caused by constraint of a binding member.

An external component of a bone conduction device, including a vibrator and a platform configured to transfer vibrations from the vibrator to skin of the recipient, wherein the vibrator and platform are configured to quick connect and quick disconnect to and from, respectively, one another.

An external component of a bone conduction device, including a vibrator and a platform configured to transfer vibrations from the vibrator to skin of the recipient, wherein the vibrator and platform are configured to quick connect and quick disconnect to and from, respectively, one another.