Loudspeaker balancing system

Claim 2

In a system of balancing loudspeaker output for a multiplespeaker installation fed by a given amplifier and wherein speakers at each of a number of speaker locations are connected thereto through respective transformers whose primary windings are connected via appropriate taps to the amplifier output and whose secondary windings are connected via appropriate taps to the speaker voice coils with proper impedance matching, the improvement comprising monitoring the amplifier output and maintaining the load therefor essentially constant, monitoring the sound output at any given speaker location, and adjusting winding taps of the transformer to provide a desired output sound level.

Claim 3

Speaker balancing system according to claim 1, including the step of providing a repeatable audio transmission having known characteristics to the speakers during such adjustment.

Claim 4

Speaker balancing system according to claim 2, wherein the amplifier output is provided with a supplemental load, which together with the load provided by the speakers equals the rated amplifier output, and including the step of readjusting the supplemental load to compensate for each change in load occasioned by any change in speaker connections.

Claim 5

In a system of balancing loudspeaker output for a multiple speaker installation, wherein sound output at each of a plurality of speaker locations is monitored aurally during adjustment of speaker transformer taps, the improvement comprising providing a repeatable voice/music transmission to be so monitored during such adjustment, and including the step of providing a standby output to the amplifier when the repeatable voice/music transmission is absent, the resulting amplifier output being adapted to effect substitution of the repeatable voice/music transmission as the amplifier input upon momentary shorting out the speaker load.

Claim 6

In a system of balancing loudspeaker output for a multiple speaker installation, wherein sound output at each of a plurality of speaker locations is monitored aurally during adjustment of speaker transformer taps, the improvement comprising providing a repeatable voice/music transmission to be so monitored during such adjustment, and including the step of providing a standby output to the amplifier when the repeatable voice/music transmission is absent, the resulting amplifier output being adapted to effect substitution of the repeatable voice/music transmission as the amplifier input upon momentary shorting out the speaker load.

Claim 7

Speaker balancing system according to Claim 4, including the steps of switching manually from the standby input to the repeatable voice/music transmission and switching automatically to the standby input after each repetition of the voice/music transmission.

Claim 8

In a loudspeaker balancing system for an audio installation having speakers at a plurality of locations and multi-tapped audio transformers for use therewith, the combination of an audio amplifying means having an output line across which the tapped primary windings of the speaker transformers are connectable in parallel as the principal load, the secondary windings of the transformers being connected with proper impedance matching to voice coils of the speakers, calibrated audio input means operatively connected to the amplifying means and adapted to provide thereto a repeatable audio transmission having known characteristics, supplemental load means for connection across the output line, and switch means for varying the traNsformer winding connections and for varying such connection of the supplemental load, including output relay means connected in series in the output line, shorting switch means across the output line at a location between the output relay means and any load across the line, the output relay being responsive to shorting of the output line by the shorting switch means and effective to actuate the audio input means.

Claim 9

In a loudspeaker balancing system for an audio installation having speakers at a plurality of locations and multi-tapped audio transformers for use therewith, the combination of an audio amplifying means having an output line across which the tapped primary windings of the speaker transformers are connectable in parallel as the principal load, the secondary windings of the transformers being connected with proper impedance matching to voice coils of the speakers, calibrated audio input means operatively connected to the amplifying means and adapted to provide thereto a repeatable audio transmission having known characteristics, supplemental load means for connection across the output line, and switch means for varying the traNsformer winding connections and for varying such connection of the supplemental load, including output relay means connected in series in the output line, shorting switch means across the output line at a location between the output relay means and any load across the line, the output relay being responsive to shorting of the output line by the shorting switch means and effective to actuate the audio input means.

Claim 10

Speaker balancing system according to Claim 6, including standby audio input means, input relay means normally connecting the standby audio input means to the input of the amplifying means and responsive to actuation of the calibrated audio input means to disconnect the standby audio input means therefrom and connect the calibrated audio input means thereto until completion of the repeatable audio transmission.

Claim 11

Speaker balancing system according to claim 7, wherein the input relay means also is adapted to short the output line around the output relay means.

Claim 12

Speaker balancing system according to claim 7, wherein the input relay means is adapted to remain in actuated condition regardless of discontinuation of the short across the output line by the shorting switch means and release of the output relay means.

Claim 13

Speaker balancing system according to claim 9, wherein the calibrated audio input means is adapted to deactivate the holding relay means upon completion of one complete transmission of the audio signals therefrom.