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Converting 2 channel out into 4 channel and Capacitors 

 

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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Tue Aug 10, 2010 11:56 pm 
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ive got a pioneer deh p4050ub deck here im looking to sell. has 3 pre outs, usb, and ipod connectable.
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Wed Aug 11, 2010 11:17 am 
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79raven wrote:
the signal converter you guys are talking about is called a high/ low pass converter..... I was trying to not use one as bought ones have gain controls and they can prove really painful to get the gains between the converter and the amp right so they dont over power the rears too much. I was hopeing there was some kind of a converter from 2 rca to 4 without using a pass converter. Might try making one though, thanks for that.

well i dont know about 2 to 4 rca cables, but you can get 1 to 2 rca's. so get 2 of those, and ya set.
http://cgi.ebay.com.au/RCA-1-Female-2-M ... 2ea24142cf

is that what you're talking about?
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Wed Aug 11, 2010 8:05 pm 
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James84 wrote:
79raven wrote:
the signal converter you guys are talking about is called a high/ low pass converter..... I was trying to not use one as bought ones have gain controls and they can prove really painful to get the gains between the converter and the amp right so they dont over power the rears too much. I was hopeing there was some kind of a converter from 2 rca to 4 without using a pass converter. Might try making one though, thanks for that.

well i dont know about 2 to 4 rca cables, but you can get 1 to 2 rca's. so get 2 of those, and ya set.
http://cgi.ebay.com.au/RCA-1-Female-2-M ... 2ea24142cf

is that what you're talking about?

no sorry man I currently have a split pair of rca's(male fronts/female rear) and I have ran both amps front and rear off the one out but what i wanted was to convert the 2 channel out into 4 channel and still keep the 4 channel stereo sound ie fronts going then the rears kick in during the song..... hope I am making sense guys
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Wed Aug 11, 2010 9:06 pm 
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79raven wrote:
James84 wrote:
79raven wrote:
the signal converter you guys are talking about is called a high/ low pass converter..... I was trying to not use one as bought ones have gain controls and they can prove really painful to get the gains between the converter and the amp right so they dont over power the rears too much. I was hopeing there was some kind of a converter from 2 rca to 4 without using a pass converter. Might try making one though, thanks for that.

well i dont know about 2 to 4 rca cables, but you can get 1 to 2 rca's. so get 2 of those, and ya set.
http://cgi.ebay.com.au/RCA-1-Female-2-M ... 2ea24142cf

is that what you're talking about?

no sorry man I currently have a split pair of rca's(male fronts/female rear) and I have ran both amps front and rear off the one out but what i wanted was to convert the 2 channel out into 4 channel and still keep the 4 channel stereo sound ie fronts going then the rears kick in during the song..... hope I am making sense guys

oh right.
well why not just do what tearlejc said?
a bit of solder, plugs, resistors, done.
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Wed Aug 11, 2010 9:46 pm 
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79raven wrote:
no sorry man I currently have a split pair of rca's(male fronts/female rear) and I have ran both amps front and rear off the one out but what i wanted was to convert the 2 channel out into 4 channel and still keep the 4 channel stereo sound ie fronts going then the rears kick in during the song..... hope I am making sense guys

there's no difference.
your CD/MP3 is only 2 channels, left and right.
any difference front/rear is a function of fade or how your crossovers are setup, which you can do via the amps (considering a 2 channel RCA output deck is unlikely to have inbuilt crossover adjustment anyway :lol:).

 

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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Wed Aug 11, 2010 11:53 pm 
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Steady ED wrote:
79raven wrote:
no sorry man I currently have a split pair of rca's(male fronts/female rear) and I have ran both amps front and rear off the one out but what i wanted was to convert the 2 channel out into 4 channel and still keep the 4 channel stereo sound ie fronts going then the rears kick in during the song..... hope I am making sense guys

there's no difference.
your CD/MP3 is only 2 channels, left and right.
any difference front/rear is a function of fade or how your crossovers are setup, which you can do via the amps (considering a 2 channel RCA output deck is unlikely to have inbuilt crossover adjustment anyway :lol:).

Dont think so man.... you might find that there are some good 2 channel rca out decks out there. :roll: The Kenwood deck in the magna even has front rear speaker setups ie 6/6x9,6/6 and 5.25/6 and that cost me $150 from Jb with a pair of s**t Kenwood 6" thrown in.....Most decks understand that more bass is needed for rear outputs as they use the boot cavity were as the fronts dont need as much bass seeing they normally use the door cavity. They also understand the only seat that matters is the drivers so they setup there processors to creat the best sound in that seat. By running 4 channels through the rear you bypass that function. Yes both 2 channel decks fade in the rears at certain intervals during a song but they do more and although running a converter would give me this I was just wondering if there was a box that could replicate that sound without converters.
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 12:38 am 
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your head unit is not putting 4 channels of signal down 2 channels of cable, and there is no way to put a box in that will make it do that.

if you are happy with the job your kenwood h/u is doing with signal processing, either ditch the 2 channels of preamp outputs and run the 4 channels of high level speaker output either into a high-low convertor or into an amp that has high level inputs.

also head over to http://www.mobileelectronics.com.au and do some reading through their forum, i think you'll learn alot.
check out the tech documents here too, i'm fairly sure pyroay covered caps, and you'll definitely find alot of info on them and whether they are suited to your setup over at MEA...

 

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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 7:40 pm 
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I never said the 2 channel rca out is going into 4 ( thats what I wanted to do)...... i said the deck through speaker wires does. No need for this man. Again you dont like a different opinion to yours but you dont actually digest what im saying. If I am going to learn alot from the site maybe you should actually read the posts man..... you might learn what I have actually said...... I understand there is the option of converters ( thats what is in the magna's kenwood deck.... if you actually read what i have said), and I am sure too I would be able to use a graph aswell. Maybe the fact there is not a unit that will convert 2 channel out into replicating the sound a deck creates (through the speaker wires) means a good idea for an invention...... 2 rca's in, sound processing chip ( would be small and easy for curcuit nerds to create) 4 channel speaker wire out. You sold something like that for $30 to $50.... would cost next to nothing to create in bulk and would sell as converters usually cost $20 to $30 per 2 channel for basic curcuit work that I have seen is not that hard to make ( thanks formodder). Compare a cheap deck + $50 or $250+ for 4 channel rca out.
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 7:45 pm 
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RCAs dont carry the power to drive a speaker. Thats what amps are for.

Your idea fails.

 

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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 8:02 pm 
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krisisdog wrote:
RCAs dont carry the power to drive a speaker. Thats what amps are for.

Your idea fails.

rca carries the sound to most amps though..... so the sound process is carried to the amp... that creates the power. Simplify 2 rca out, into box, 4 rca out into amp to create the same sound process that the deck creates through the speaker wires. also I meant 2 rca in to 4 rca out not 2 rca in 4 speaker wires out.
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 8:30 pm 
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I think you need to stop and rethink what you're trying to achieve.

It doesnt matter how you split the RCAs, you'll still only end up with a Left and Right channel. Front and rear are the same - the decks the same deal.

The splitters that split 1 rca into 2 do the exact same thing as you are describing.



Quit now :|

 

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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 8:34 pm 
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It's possible to do, but I think you will have to be very careful on the loading on the HU outputs. With 1-2rca splitters on each of your outputs, to the head unit, the amps will effectively be seen to be in parallel. Firstly the output on the HU may not like that extra load so you have to start off with very low output (volume control). In addition, the two amps (unless they exactly the same) will have different input resistances. What that means is that they both won't get exactly the same signal. One will always "take" more of the signal than the other which means that either the front or back speakers will be louder by a certain factor. I am not sure if you can really fix that without changing the input resistances on the amplifiers themselves; no worries if you're an engineer.

But they'll probably tell you that the easiest option, is to sell yours or put it in the missus car and buy a head unit with the correct number of rca outputs you need.

 

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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 10:18 pm 
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But by using 4 channel amp you would be able to reproduce the sound of the deck through the speaker wires, but magnetfied volume/power by the amp. Yes 2 seperate amps would pose issues but not too many people do that for front/ rears. The only reason I have is the fact the Nc's amp is Alpine and works well with its built in crossover to run 6"without too much bass and a sub or 2. I just wanted to put some more power to the fronts to compensate for the power gain of the rears and was thinking of other options apart from going a converter. I am leaning towards a graph...... could you go a graph post amps? Maybe I could d**k around with gains, freq and all the other options a graph gives to get close to the sound I want from the fronts and rears.Will not be the same as what front/rear distribution the standard speaker wires with converters would create though but by going post amp the booster will add more power to the already amplified output... right? I do need to say though I am not the bloke who cruises down the street with doof doof screaming out the car and all you can hear is the car shaking, I am after a nice sound with what I have and without spending a couple of grand in the process. I have 4 kids and this is my daily driver ( the Magna's the family car) and so far I have spent about $150 on the lanes total sound system by buying smart on the net and using what I have had from previous projects. So its so far a 10" rockwood sub, sony 6" 4 ways, Pioneer 6" 3 ways, factory tweeters in dash, sony mp3 deck, Pioneer 2 channel amp and the Factory alpine amp.
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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Thu Aug 12, 2010 10:57 pm 
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clearly im wrong then, good luck with getting 4 distinct channels from the non fading rear outputs of your cheap head unit.

 

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 Post subject: Re: Converting 2 channel out into 4 channel and Capacitors
Posted: Fri Aug 13, 2010 6:44 am 
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Steady ED wrote:
clearly im wrong then, good luck with getting 4 distinct channels from the non fading rear outputs of your cheap head unit.

I can..... by using a high/low converter from the front speaker cables. This thread was about any other options out there. You do not need to spend huge amounts to get good sound. The magna's total system cost me under $300 and I can assure you the thing will give you perfect sound for the internal cavity of that car. I dont need to spend huge amounts so I can sit down the street with it cranked showing everyone how small my d**k is or the fact I am sitting in the car and not driving it because I cannot afford the fuel because I spent all my money on my system
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