Shure FP22 Typical Monitoring Connections, Intercom Capability, Rts, Special Applications

stereo signal since both 1/4-inch Stereo Line jacks are connected in parallel.

2.When internal switch S105 is set for Mono, the FP22 accepts individual left and right 1/4-inch mono connectors to provide a stereo signal. Stereo Line jack (1) is the left input; Stereo Line jack (2) is the right input. No loopthrough capability is available with S105 set for Mono.

TYPICAL MONITORING CONNECTIONS

1.One Mono Input. A mono signal connected to an XLR or phone jack will be monitored as a mono headphone signal. (When using the Mono XLR connectors, the Line/Mic switch should be set to match the input.)

2.One Stereo Input. A stereo signal connected to the Stereo Line jacks can be monitored as a stereo output on stereo head- phones or as a mono output.

3.One Stereo Input Plus One Mono Input. A mono signal input through the Mono XLR connector and a stereo signal input through the Stereo Line jacks can be monitored as a mixed out- put, with both signals appearing in the stereo headphones.

4.Three Mono Inputs - Stereo Headphone Signal Output. Three mono signals can be accepted through the mono-XLR jacks and the stereo line jacks, and mixed and monitored as a stereo signal in the stereo headphones.

NOTE: The FP22 can be modified so that all input jacks are in parallel. This duplicates the Shure FP12 in functionality. This modification allows monitoring in mono only. Please contact Shure's Product Applications Group for details on this modifi- cation.

INTERCOM CAPABILITY

The FP22 can interface to commercially available intercom systems, such as RTS, Telex and ClearCom. The diagrams be- low show how to interface the FP22 to these systems and what can be monitored. More information about intercom systems can be obtained from the intercom manufacturers.

Telex Intercom Systems (Figure 1)

Telex uses a standard balanced audio line. No modification is required to interface the FP22 with Telex intercoms.

1.Use the Mono XLR Loopthrough connections.

2.Mono XLR level switch should be set to the Line position.

3.24 volts phantom power on the intercom line is passed through the FP22.

1	2
	AUDIO (+)	+24 VDC
	3
	AUDIO (±)	+24 VDC
	REF

FIGURE 1

RTS and ClearCom Systems (Figure 2)

These two systems use an unbalanced audio line which re- quires use of the 1/4-inch line connectors of the FP22 for opera- tion. The Y±cable depicted in Figure 2 is required for RTS and ClearCom intercom systems.

1.The above Y±cable is placed in-line into the intercom system.

2.Set internal switch S105 to Stereo (factory setting).

Wiring for RTS and ClearCom Systems

Pin	RTS		ClearCom
2	Audio channel 1, 24Vdc	Audio, 18-36 Vdc power
3	Audio channel 2, 24 Vdc	Audio, 12 Vdc call signal
1	Reference (ground)	Reference (ground or com-
			mon)

1	2		2	1
	3		3
			TO STEREO LINE
			LOOPTHROUGH
			CONNECTION ON FP22
	SLEEVE	RING	TIP

FIGURE 2

SPECIAL APPLICATIONS

Troubleshooting stage sound systems. The FP22 can be used to trace a signal line when one or more microphones are not working on stage. To locate the malfunction, loop the signal through the FP22 wherever an XLR or phone connector is lo- cated and monitor the signal.

Field monitoring applications can be set up by inserting FP22 units ªin lineº without affecting the signals.

On stage monitoring. With the FP22, an effective on±stage in-ear monitor system can be created. 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 head- phone volume as well as a mix control of their individual voice or instrument with the stereo signal.

Boosting headphone output. 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. The FP22 will provide a high±quality headphone output with the ability to loop through to another FP22.

Using the FP22 as a two-stage intercom system. A two- stage intercom system can be created by connecting two FP22 units with a single standard microphone cable. Each person con- nects a Shure SM12A or other headset microphone's XLR output and earphone input connector to their individual FP22. Both mi- crophone signals appear at each FP22 headphone output.

Practice headphone amplifier for microphones or other sources, such as electric instruments, synthesizers, etc. Con- nect the output from any instrument into the FP22 and monitor the headphones.

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