Crown Audio IQ P.I.P.-DSP manual + - +, IQ-P.I.P.-DSPOutput, IQ Component Input, IQ Mixer

IQ–P.I.P.–DSPProgrammable Input Processor with DSP for IQ Systems

than 1,000 feet (305 m)—or when required by high-capacitance wire. Although we recommend adding a repeater for loops longer than 1,000 feet, it is often possible to go 2,000 feet (610 m) or more. The most significant characteristic of the wire is its capacitance. The lower the capaci- tance, the longer the loop can be. Unshielded wire typically has less capacitance.

•Never use the ground wire in a mic snake line. It may sometimes be convenient to run Crown Bus data signals to and from stage monitor amplifiers along unused wire pairs in a mic snake. If this is done, do not use the ground wire which is nor- mally connected to pin 1 on an XLR connector or data noise will be added to the audio lines. Use only the signal lines which normally connect to pins 2 and 3 of the XLRs. The maximum possible Crown Bus loop distance will be less because typical mic cables have high capacitance.

Outside RF interference is seldom a problem for a Crown Bus loop—especially if shielded twisted-pair wire is used. However, there are extreme situations when fiber optic wiring is recommended. For example, locating a Crown Bus loop next to an AM radio transmission line may require fiber optic cabling. An extremely long Crown Bus loop distance may also require fiber optic cabling.

There are two different types of connectors used for Crown Bus wiring: DIN connectors and screw terminal plugs. The IQ–P.I.P.–DSPuses a 5-pin DIN connector for input and a 4-pin DIN connector for output. Figure 3.7 shows how they should be wired.

IQ–P.I.P.–DSP Output		IQ Component Input
4	1	5			1
3	2	4			2
					3
GND 1				1	Input (–)
Output (+)	2		2		Input (+)
Not used 3		Optional Shield	3		GND
Not used 4			4		Not used
			5		Not used

Figure 3.7 IQ–P.I.P.–DSP Output Connection to Another IQ Component with DIN Connectors

The next two figures show how to connect the IQ– P.I.P.–DSPto other IQ components with different connectors. Figure 3.8 shows how the Crown Bus output of the IQ–P.I.P.–DSPshould be connected to an IQ component with a screw terminal plug. Figure 3.9 shows how the Crown Bus input of the IQ–P.I.P.–DSP

should be connected to an IQ component with a screw terminal plug.

IQ–P.I.P.–DSP Output		IQ Mixer
		OUT	IN
4	1	+ – +	–
3	2
GND 1		Output (+)
Output (+)	2	Output (–)
Not used 3		Input (+)
Not used 4		Input (–)

Figure 3.8 IQ–P.I.P.–DSP Output Connection to an IQ Component with a Screw Terminal Plug Connector

IQ Mixer		IQ–P.I.P.–DSP Input
OUT	IN	5	1
+ – +	–
		4	2
			3
Output (+)		1	Input (–)
Output (–)		2	Input (+)
Input (+)		3	GND
Input (–)		Optional Shield	Not used
		4
		5	Not used

Figure 3.9 An IQ Component with Screw Terminal

Plug Connected to the IQ–P.I.P.–DSP Input

The IQ components in a Crown Bus loop are wired sequentially. The loop begins and ends with the IQ interface. The output of one IQ component “loops” to the input of the next and so on as shown in Figure 3.10.

IQ Interface

IQ Component
IQ Component	BUS LOOP
	CROWN
IQ Component

Fig. 3.10 Crown Bus Wiring “Loops” from the Output to the Input of Each IQ Component

Reference Manual Page 13