Abstract: A full-range speaker is driven by an original sound signal output from a sound source. A vibration detection unit detects vibration of the full-range speaker and outputs a playback signal. A subtractor outputs an error signal indicating the difference between the original sound signal and the play back signal. The error signal is amplified by the amplifier to drive the woofer which increases the sound pressure level in the low frequency range by outputting a sound in the same phase as the sound of the full range speaker if the sound pressure level of the full range speaker is insufficient, or in the opposite phase as the sound of the full range speaker if the sound pressure level is excessive. If the sound pressure level is excessive, the sound pressure level is reduced by outputting a sound in phase with the sound of the full range speaker.

Abstract: A full-range speaker is driven by an original sound signal output from a sound source. A vibration detection unit detects vibration of the full-range speaker and outputs a playback signal. A subtractor outputs an error signal indicating the difference between the original sound signal and the play back signal. The error signal is amplified by the amplifier to drive the woofer which increases the sound pressure level in the low frequency range by outputting a sound in the same phase as the sound of the full range speaker if the sound pressure level of the full range speaker is insufficient, or in the opposite phase as the sound of the full range speaker if the sound pressure level is excessive. If the sound pressure level is excessive, the sound pressure level is reduced by outputting a sound in phase with the sound of the full range speaker.

Abstract: A connector device is formed of a case, first and second sockets housed within the case, each having on its front surface side a recess portion into which a modular connector is inserted and having a plurality of modular terminals disposed within the recess portion and a plurality of contacts conducted to the plurality of modular terminals, respectively and resiliently protruded to different positions of a rear surface side, the first socket being rotatable within the case, and a connection member whose one surface and the other surface are respectively opposed to the rear surface sides of the first and second sockets, the connection member being disposed within the case so as to become coaxial with the first and second sockets, the connection member having on the one surface a plurality of second terminals which continuously contact with the plurality of contacts of the first socket when the first socket is rotated and having on the other surface a plurality of third terminals which are respectively conducte

Abstract: A telephone includes a telephone body, a handset and a telephone network line hold mechanism. The telephone body includes a handset cradle on which the handset is placed, a plurality of operation buttons and the like. The telephone is placed in the offhook state when the user lifts the handset from the handset cradle and placed in the on-hook state when the user places the handset on the handset cradle. The telephone network line hold mechanism is energized when the user places the handset on the telephone body at its position in which the offhook state of the telephone is retained.

Abstract: A telephone includes a telephone body, a handset and a telephone network line hold mechanism. The telephone body includes a handset cradle on which the handset is placed, a plurality of operation buttons and the like. The telephone is placed in the offhook state when the user lifts the handset from the handset cradle and placed in the on-hook state when the user places the handset on the handset cradle. The telephone network line hold mechanism is energized when the user places the handset on the telephone body at its position in which the offhook state of the telephone is retained.