Patent ID: 8077881

Claim:
A sound device, comprising: an input terminal for electronic signal input; a sub woofer mode comprising a low pass filter adapted to filter electronic signals input to the input terminal and to output low frequency range electronic signals; a full range mode comprising a crossover filter adapted to filter electronic signals input on the input terminal, and to output electronic signals with both low frequency range and high frequency range respectively; a switch arrangement adapted to select between full range mode and sub woofer mode; a primary power amplifier adapted to amplify (1) low frequency range electronic signals output from the crossover filter when the switch arrangement selects full range mode, and (2) electronic signals output from the low pass filter when the switch arrangement selects sub woofer mode; a secondary power amplifier adapted to amplify high frequency range electronic signals output from the crossover filter when the switch arrangement selects full range mode; a woofer adapted to be operated by electronic signals amplified by the primary power amplifier, and; a tweeter adapted to be operated by electronic signals amplified by the secondary power amplifier.