An acoustic reproducing apparatus is provided which includes first and second channels and first and second speakers, all disposed in a housing with a sound path for acoustically coupling the first and second speakers. The sound path has disposed therein sound absorbing material which forms a low pass filter which operates to add the low frequency signal component of the first channel to the second channel and also operates to add the low frequency signal component of the second channel to the first channel to produce a composite low frequency signal with greater amplitude which is reproduced in phase by each of the first and second speakers.
In an adjustable power fader device for a loudspeaker system with at least four speakers right and left channel input signals are received by respective power fader circuits. Each power fader circuit has a variable resistor connected across its input terminals and a series of at least two speakers across its output terminals. The sliding terminal of the variable resistor is connected via a capacitor to the mid point of the series of speakers, one of which has good low pitch sound reproduction. The two sliding terminals of the respective power fader circuits are movable together and the level of audio signals applied to the loudspeakers is accordingly adjusted.
A speaker assembly is disclosed. The speaker assembly employs a unique design permitting reduction in the size and weight of the speaker assembly, while maintaining high fidelity sound. The speaker incorporates inverted midranges, with opposed tweeters to produce high fidelity stereo sound. The speaker assembly also includes a strain relief member which reduces the weight of the speaker assembly. The speaker assembly also includes a pair of inductors with securing bolts running therethrough to increase the efficiency of the induction coils and permit the inductors to function as structural spacer.
Wirelessly linking a portable audio device to an external audio system permits the external audio system to generate audible signals that enhance local playback of audio by the portable device. For example, the portable device wirelessly transmits lower frequency components of an audio signal to a subwoofer system for reproduction of bass frequencies extending below the playback capability of the portable device. In this manner, the external audio system provides bass enhancement for the portable audio device. Wireless transmissions between the portable audio device and the external audio system may be, but are not limited to, optical or radio frequency (RF) transmissions. Where RF signaling is used, the wireless link may be based on wireless network links, such as those supported by Bluetooth and 802.11b standards, or based on, for example, dedicated RF interfaces.
