Amplifier system

Claim 1

STEREOPHONIC SIGNAL REPRODUCING APPARATUS FOR UTILIZING A RIGHT SIGNAL COMPONENT AND A LEFT SIGNAL COMPONENT REPRESENTING STEREOPHONIC SOUND ENERGY, SAID APPARATUS INCLUDING IN COMBINATION, PICKUP MEANS INCLUDING A FIRST INPUT CIRCUIT PORTION PROVIDING THE FIRST COMPOSITE SIGNAL REPRESENTING THE DIFFERENCE BETWEEN THE RIGHT AND LEFT SIGNAL COMPONENTS AND A SECOND INPUT CIRCUIT PORTION PROVIDING A SECOND COMPOSITE SIGNAL REPRESENTING THE SUMMATION OF THE RIGHT AND LEFT SIGNAL COMPONENTS, FIRST AMPLIFIER MEANS COUPLED TO SAID FIRST INPUT CIRCUIT PORTION AND HAVING A FREQUENCY PASS CHARACTERISTIC IN A FREQUENCY RANGE IN WHICH SUBSTANTIALLY ALL OF THE STEREOPHONIC INFORMATION OCCURS AND HAVING A RELATIVELY LOW POWER SINGLE ENDED OUTPUT AMPLIFIER STAGE, SECOND AMPLIFIER MEANS COUPLED TO SAID SECOND INPUT CIRCUIT PORTION AND HAVING A FREQUENCY PASS CHARACTERISTIC EXTENDING IN A RANGE BOTH WITHIN AND BELOW THE AFOREMENTIONED FREQUENCY RANGE AND FURTHER HAVING A RELATIVELY HIGH POWER PUSH-PULL OUTPUT AMPLIFIER STAGE, FIRST AND SECOND LOUDSPEAKER MEANS, A MATRIX CIRCUIT CONNECTED BETWEEN SAID FIRST AND SECOND AMPLIFIER MEANS AND SAID FIRST AND SECOND LOUDSPEAKER MEANS SO THAT SAID LOUDSPEAKER MEANS ARE ENERGIZED INDIVIDUALLY BY THE LEFT SIGNAL COMPONENT AND THE RIGHT SIGNAL COMPONENT AS TRANSLATED BY SAID FIRST AND SECOND AMPLIFIER MEANS AND BY SIGNALS BELOW SAID FREQUENCY RANGES TRANSLATED BY SAID SECOND AMPLIFIER MEANS AND A VARIABLE LEVEL CONTROL CONNECTED TO SAID AMPLIFIER MEANS FOR ADJUSTING THE BALANCE BETWEEN SIGNALS TRANSLATED BY SAID FIRST AND SECOND AMPLIFIER MEANS TO CONTROL STEREOPHONIC SIGNAL SEPARATION IN SAID FIRST AND SECOND LOUDSPEAKER MEANS.