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40 posts

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# 101117 25-Apr-2012 00:01
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HI All
Have just bought a 4 channel high level to low level rca converter for my ford ba xr6 so that i can add my own amps and sub and suprise suprise there were no wiring diagrams in the box. Although its pretty straight forward there area couple of connections i am not sure of, I have a O E M precision differential converter & line out converter with built in 12v remote turn on switch.
Now the connections i need advise on are
Agnd
Pgnd
Vcc
I can not work out if it needs a power source to it or just to be grounded, As for the remote switch i have seen on other types of converters that when the high level speaker is detected it switches the remote live on to the amps does this sound correct ?

Any help would be most appreciated

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Ultimate Geek


  # 614688 25-Apr-2012 00:48
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Vcc usually means the power supply. Agnd and Pgnd both would seems to be 'grounds' of some kind.  What other connections are there? What colour are the wires? And are any of them grouped together?

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Ultimate Geek


  # 614690 25-Apr-2012 00:52
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Possibly Agnd = Audio ground, Pgnd = Power ground.  Only guessing though.  And yeah I would expect it to detect the high level input and swtich on remote wire.

 
 
 
 


Banana?
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  # 614727 25-Apr-2012 07:07
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Agnd could also be Accessory Ground. Though surely all grounds are the same?

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  # 614764 25-Apr-2012 09:16
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All the guesses for AGND, PGND, VCC here so far seem to make sense.

Possibly it is for a positive-common system rather than the ususual negative common - i.e. designed so that electric devices have permenant access to positive, and negative is switched? This is pretty uncommon in cars these days though, so not sure how you would interface it with a negative-common system (which I would assume you have)



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Geek


  # 615137 25-Apr-2012 20:24
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Cheers Guys all sorted. Now the next thing any ideas how to split 1 set of RCA to be able to run 3 amplifiers. my stereo only has left and right rca pre outs on.

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  # 615161 25-Apr-2012 21:24
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Generally the output impedance of a Line Out socket is much lower than the input impedance of a Line In socket, meaning you can simply parallel the amplifier inputs together and drive them all from one output.  Obviously, there is a practical limit to how many inputs you can parallel together in this way before the Line Out circuitry in the head unit starts distorting.

Best way is to try it first with 2 amp inputs paralleled and if that works OK, then add the third.  You might just get lucky and not need to buy any distribution (splitting) amplifier.





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Ultimate Geek


  # 615162 25-Apr-2012 21:24
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do any of your amp have both rca in and out if so just daisy chain em. Or you can buy a splitter. this will do the job http://www.jaycar.co.nz/productView.asp?ID=WA7090&form=CAT2&SUBCATID=1013#4

 
 
 
 




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Geek


  # 615183 25-Apr-2012 22:02
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no only inputs, and how do you parallel them together?

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Ultimate Geek


  # 615201 25-Apr-2012 22:28
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that link i posted you plug between the amps and the run from the head unit goes into the first one and so on. Audio signal does degrade the more times its disrupted so as posted before try 2 before the 3rd and if you are going to run 3 amps how have you set up your power? I hope you have got a power block and fused individually etc. Also a capacitor wont be a bad idea



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Geek


  # 615203 25-Apr-2012 22:33
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thanks for that, yeah have o gauge from battery with in-line fuse then a distributor with 4 gauge to the amps, have thought about getting a capacitor, will look into that on saturday.
Cheers for your advise

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