Multi channel surround sound simulation device

A passive multi channel surround sound simulation device comprising,

• left and right input jacks for receiving a two channel speaker level stereophonic signal, the left and right input jack each having a positive and negative terminal, the stereophonic signal originating from a stereophonic signal source, the stereophonic signal source having a left and right signal output, the left signal output of the signal source connected to the left input jack, and the right signal output of the signal source connected to the right input jack,
• interfacing means for producing from the two channel speaker level stereophonic signal left and right primary speaker level signals, left and right secondary speaker level signals, a mono center speaker level signal, and a surround signal ground separate from an input ground,
• left and right primary speaker level outputs for connecting the left and right primary speaker level signals to left and right primary loudspeakers,
• left and right secondary speaker level outputs for connecting the left and right secondary speaker level signals to left and right secondary loudspeakers, the left and right secondary speaker level outputs electrically coupled to the surround signal ground,
• means for converting the mono center speaker level signal to a mono center line level signal,
• a mono center line level output for connecting the mono center line level signal to a center loudspeaker through a center power amplifier, the mono center line level output electrically coupled to the surround signal ground,
• means for converting the left and right secondary speaker level signals to left and right secondary line level signals, and
• left and right secondary line level outputs for connecting the left and right secondary line level signals alternately to the left and right secondary loudspeakers through left and right secondary power amplifiers, the left and right secondary line level outputs electrically coupled to the surround signal ground.

A passive multi channel surround sound simulation device comprising,

• left and right input jacks for receiving a two channel speaker level stereophonic signal, the left and right input jack each having a positive and negative terminal, the stereophonic signal originating from a stereophonic signal source, the stereophonic signal source having a left and right signal output, the left signal output of the signal source connected to the left input jack, and the right signal output of the signal source connected to the right input jack,
• an electronic circuit for producing from the two channel speaker level stereophonic signal left and right primary speaker level signals, left and right secondary speaker level signals, a mono center line level signal, left and right secondary line level outputs, and a surround signal ground separate from an input ground,
• left and right primary speaker level outputs for connecting the left and right primary speaker level signals to left and right primary loudspeakers,
• left and right secondary speaker level outputs for connecting the left and right secondary speaker level signals to left and right secondary loudspeakers, the left and right secondary speaker level outputs electrically coupled to the surround signal ground,
• a mono center line level output for connecting the mono center line level signal to a center loudspeaker through a center power amplifier, the mono center line level output electrically coupled to the surround signal ground,
• left and right secondary line level outputs for connecting the left and right secondary line level signals alternately to the left and right secondary loudspeakers through left and right secondary power amplifiers, the left and right secondary line level outputs electrically coupled to the surround signal ground,
• a three position gang switch electrically coupled to the circuit for alternately routing the stereophonic signal, a first position to the primary and center outputs, a second position to the secondary outputs, and a third position to the primary, center, and secondary outputs,
• a triple gang potentiometer electrically coupled to the circuit for adjusting an output level to the secondary and center outputs, the gang potentiometer electrically coupled to the circuit such that adjustments to the gang potentiometer provide relative changes to the output level of the secondary and center outputs.