Crown PIP-RPA Reference Manual Download Page 1

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P.I.P.-RPA

P.I.P.-RPAT

125658-4

7/02

Printed on

recycled paper.

© 2002 by Crown Audio, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A.
Telephone: 574-294-8000. Fax: 574-294-8329. Trademark Notice: PIP

is a

trademark and

Crown and P.I.P. are registered trademarks of Crown

International. Other trademarks are the property of their respective owners.

Summary of Contents for PIP-RPA

Page 1: ... by Crown Audio Inc P O Box 1000 Elkhart IN 46515 1000 U S A Telephone 574 294 8000 Fax 574 294 8329 Trademark Notice PIP is a trademark and Crown and P I P are registered trademarks of Crown International Other trademarks are the property of their respective owners ...

Page 2: ...Page 2 Reference Manual P I P RPA Fig 1 1 P I P RPA ...

Page 3: ...ntrol the VCA voltage controlled ampli fier of each input The remote control can be a fixed resistor for a fixed attenuation or a 10 K potentiometer pot for variable attenuation A 10 VDC source is conveniently provided on the PIP for the remote If no attenu ation is desired the 10 V source must be connected directly to the remote control input Up to 84 dB of attenua tion is available with each VCA...

Page 4: ...er B Input Level Controls The level of each main audio input canbeadjustedwiththeselevelcon trols They have a range of 36 dB Usingthem youcancompensatefor a wide range of input signal levels C Barrier Connectors Allconnectionsaremadeusingthese screw down barrier block connec tors Important Do not use stranded wire unless the wire ends are first tinned Strip no more than 1 4 inch 6 4 mm of insulati...

Page 5: ...n inverting the sig nal Tie Input Finally there is a Tie input which is a logic input and can be switched on byfeedingapositiveDCvoltagetoit Itenablestheaudioinputsandvoice over priorities of Ch 1 to be tied to Ch 2 and vice versa D Routing Priority Switch This 8 segment DIP dual in line package switchiscomprisedofeight individual switches Flipping them downtowardthebottomcircuitboard turns them o...

Page 6: ...the prior ity of Inputs B C and D Input A always has the highest priority Input C always has the second highest priority The routing priority switch is the 8 segment DIP switch shown in Fig ures 2 1 and 3 2 Notice that it is mounted upside down to the under side component side of the top circuit board NormallythemixofInputsAandBfeeds Channel1oftheamplifierandthemixof Inputs C and D feeds Channel 2...

Page 7: ...witch works in conjuction with the Tie function The table in Figure 3 3 shows that all the DIP switch sections except 5 and 7 func tion only when the Tie function is on The Tie function is designed to be remotely controlled and is fully de scribed in Section 3 7 If you have no desire to control it remotely and want to leave it on simply install a jumper between the 10 V output and the Tie input on...

Page 8: ...utsB CandDwillallduck70 dB when there is a signal over the sensitivity threshold on A Inputs B and D will duck 46 dB when a signal on Input C surpasses its threshold In thisscenario backgroundmusiconB and D would be pulled under by a normal page on Input C and Input A could be reserved for emergency an nouncements 3 3 Setting the Voice Over Sensitivity If you gave all four main audio inputs the sa...

Page 9: ...fyouneedmore informationpleasecontactourTech nicalSupportGroupat800 342 6939 or contact your local representative For the sake of simplicity our ex ample will describe how to set just one of the two voice over sensitivity controls We will also assume that you do not have a P I P EXT The procedure involves turning up the voice over sensitivity until it is trig gered by the ambient noise level thenb...

Page 10: ...though the amplifier is off there could still be enough energy remaining to cause electric shock You may need a phillips screwdriver to remove the existing PIP module or panel from your amplifier 1 Turn down the level controls full counterclockwise turn off the amplifierandunplugitfromtheAC power source Fig 3 8 Steps 1 2 Input A 4 If you haven t yet done so adjust the duck level per Section 3 2 5 ...

Page 11: ...in cable B is connected Both ribbon cables should extend below the PIP2 input adapter Next insert the edge connector of the P I P RPA into the PIP2 input adapter see Figure 3 11 and insert the assembly into the PIP opening in the back of the amplifier 4 SecuretheP I P RPAwiththetwo screws and lock washers provided The lock washers are important because they bond the PIP to the chassis ground of th...

Page 12: ...end you strip away only 1 4 inch 6 4 mm of insulation Also if stranded wire is used first tin the ends before inserting them in the connector Important If the amplifier is used in eitherBridged MonoorParallel Mono mode you must turn the Ch 2 ampli fier level control off fully counter clockwise The input and level con trol of Ch 2 are not defeated in mono mode soanysignalfedintoCh 2will beat agains...

Page 13: ... between the PIP s 10 V output and the remote input Figure 3 16 Fig 3 13 Locating the Ground Isolation Jumper 3 6 Wiring the Remote Control Inputs Eachinputhasanattenuatorwhichis remote controlled and is located in the circuit after the input mode input level control and voice over duck ing circuitry See Figure 3 19 Theattenuatorisavoltage controlled amplifier VCA which is operated by a DC voltage...

Page 14: ...fault to maximum attenuation 3 7 The Tie Input TheTiefunctionisprovidedto tie the audio signal and input priorities of Channel 1 and 2 together This en ables all four inputs to be mixed into one or both channels of the amplifier WhenevertheTiefunctionisenabled the audio from Input A is automati cally connected to Channel 2 The routing priority DIP switch also af fects the Tie function The tables i...

Page 15: ...est noise This is shown in Figure 3 18 No resistor is required for con nection to the audio bus outputs Since the audio bus inputs and out puts are unbalanced two things should be considered First the input grounds are always lifted from the chassisground Second in lineisola tiontransformersshouldbeaddedfor long input or output wire runs Note Only the mixed audio signal from Inputs A B C and D app...

Page 16: ...remote controlled attenua tor A routing priority switch assigns an override priority to each input Inputs A and C each have sensing circuitry which can be used to acti vate an attenuation duck circuit to override other inputs Nominal Input Impedance Line 11 4 K ohms balanced Mic 1 4 K ohm balanced Phantom Power 18 VDC at 9 mA with a 2 K ohm output impedance Recommended Source Imped ance Mic or Lin...

Page 17: ...en dent unbalanced current summing input for each output channel of the PIP There is unity gain into either input when a 10 K ohm source resis tor is used Audio Bus Outputs One indepen dent unbalanced output for each out put channel of the PIP representing the mix of the A D main audio inputs Suggested for use with 10 K ohm or greater input impedance The output impedance is 75 ohms Capable of driv...

Page 18: ...Page 18 Reference Manual P I P RPA Fig 3 19 Circuit Block Diagram ...

Page 19: ...ontrol because of its C taper Com monA tapersliderscanbeflippedto create the C taper but A taper ro tary pots can t be flipped Linear pots are not recommended Appendix Important This Appendix includes instructions on how to modify the P I P RPA to accommodate special needs Only a competent technician should attempt to make these modi fications Other than the ones de scribed here no other modificat...

Page 20: ...thers grouped with it will be slaves The procedure is simple 1 Select which input you want to use as the master input Connect the remote control pot to it Input A is the master in Figure A 2 2 Remove the appropriate scaling resisters from all but the master input Figure A 1 3 Jumper the master remote pot to all the slave remote control inputs To control the level of Inputs A and C with the pot for...

Page 21: ...sor re member these are unbalanced lines Connect the output of the ex ternal processor to the audio bus input through the specified 10 K re sistor see Section 3 8 See Section 4fortheinputandoutputcapabilities of the audio bus Fig A 4 Remote Control Limit Resistor Value Max Attenuation The table in Figure A 4 shows the resistorvaluetousefordifferentmaxi mum attenuation values Note ThevaluesinFigure...

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