User manual SHURE FP-22

[. . . ] 50 k ±10% Stereo Line (pad at 30 dB) . 53 k ±10% Headphone Output Impedance (at 1 kHz) 10. 2 ± 10% Printed in U. S. A. Phase Input in phase with output. Pin 2 of XLR input in phase with tip and ring of all Headphones jacks. Approximately 15 hours under normal operating conditions External . [. . . ] OPERATION NOTE: A simplified block diagram on the side of the FP22 provides a quick reference to its functional circuitry. Rotate the overall Volume control clockwise to power the FP22. The Power LED indicator lights to show that the unit is on. Turn the level control carefully to avoid excessive headphone levels. The Volume control adjusts both the Mono XLR signal and Stereo Line signal. WARNING The FP22 can produce ear­damaging headphone levels. Turn the headphones Volume control up slowly when making adjustments. Pull out the Volume control knob and rotate clockwise to increase the volume level of the Mono XLR signal only. This adjustment will not affect the overall volume. A center detent position provides a starting volume level for the Mono XLR signal. Rotate the Balance control left or right to control the overall left/ right signal balance. If mono monitoring is desirable, set the Stereo/Mono switch to Mono. INTERNAL SWITCHES Two switches are located inside the FP22. These control the signal path through the unit. The switches are located on the vertically mounted printed circuit board inside the unit adjacent to the Loopthrough phone jacks. To access the switches, remove the three Phillips-head screws on the side panel of the unit. Internal Switch S-104 consists of two independent singlepole, single­throw switches controlling the path of the Mono XLR input signal: 1. When S104-1 and -2 are in the On position, the Mono XLR signal is routed to both left and right earphones. When S104-1 is in the On position and S104-2 is in the Off position, the Mono XLR signal goes to the left channel. When S104-1 is in the Off position and S104-2 is in the On position, the Mono XLR signal goes only to the right channel. If both S104-1 and -2 are in the Off position, NO signal from the Mono XLR input appears at the headphone outputs. Internal Switch S105 is a two­position slide switch that changes the Stereo Line jacks from Loopthrough TRS stereo inputs to separate left and right mono inputs. When internal switch S105 is set for stereo, the Stereo Line jacks accept a stereo signal on a single 1/4-inch stereo connector (tipleft; ring-right; sleeve-ground). [. . . ] From a mixing console a stereo signal can be looped through to multiple FP22's, while the Mono XLR jack can be used for an individual's microphone or musical instrument. Each performer has control of overall headphone volume as well as a mix control of their individual voice or instrument with the stereo signal. The FP22 can be used to boost the headphone output of existing devices. The stereo headphone output of an audio device can be connected to the Stereo Line connectors of the FP22. [. . . ]