rca splitter

[haynze]

could neone show me a diagram of a rca splitter connected to rca cables going into a 4 channel amp and coming from a headunit with one rca preout
thnx

p.s i am looking at the different ways to run the rear speakers(2) and sub off a 4 channel amp connected to a headunit with only one rca output(rear output)

[garfa]

mate i dont really see how there could be many different ways to run a sub and 2 speakers off a 4 channel amp.....2 channels for the speakers and then the other 2 bridged or 2 channels for the speakers and then only one other channel for the sub leaving a channel spare.
as for taking the rear outs from the h/u wouldnt you just split them to the 2 speaker channels and then combind for the channel/s driving the sub?
side note: oh yea 700th post!

[azkwazere]

Yeah, a 4channel anp only needs one input (the one outer you HU) and then you would just run the the 2 speakers and the sub from your amp... may have to look into getting another sub though as its not good to have spare channels....

hmmmm

aZK.

[StoneX]

Yeah, a 4channel anp only needs one input (the one outer you HU) and then you would just run the the 2 speakers and the sub from your amp... may have to look into getting another sub though as its not good to have spare channels....

hmmmm

aZK.

The sub would be bridged over two channels, there would not be any spare channels.

Why is it not good to have spare channels?

[haynze]

so i can just run one set of rca cables from the headunit to the amp without the use of rca splitter. then run 2 rear speakers and sub off the amp.

also when the ub is bridged off the 3rd nd 4th channels do the two speaker wire ports(e.g 3rd ch+&4th ch- or 3rd ch-&4th ch+) that dont get used still equal a channel. i thought tht by bridging the sub the 3rd and 4th channels just become one e.g(Left rear speaker off channel 1, Right rear speaker off channel 2, and the sub off "channel 3"(channel 3 equals bridged off 3rd and 4th channel)

[garfa]

The sub would be bridged over two channels, there would not be any spare channels.

Why is it not good to have spare channels?

do you always ask my questions?

[DJ Majah]

Thats a valid question, I'd like to know the answer too.

[lilkel]

yeah me too!!! i'm sure ther's a few people doing it out there who would also like to know if it's no good for there amps!!

[Brycestro]

not sure if this is what your after, but have a look anyway

http://www.crazycables.com.au/produc...d=168&catid=36

[stocky]

best bet would be to have a look at jaycar

[Tasmaniak]

Why is it not good to have spare channels?

Means you wasted your money

[semi]

how many amps have the feature to run 4 speakers off 2 or 4 rca's?? mine has it, but im not sure how common it is

[StoneX]

I've only seen Pioneer amps with it... But I haven't taken much notice of other brands.

[semi]

mines an alpine, so thats at least 2 brands

[BerlinaBen]

Feel free to let me know if I have misunderstood, but if you only have a single RCA output from your head unit, which you are then using as an input to your 4 channell amp, then you no longer have a stereo signal (i.e. left AND right channels). This would be very LO FI. Even if you split the signal, you still don't have real stereo.
In my experience if you only have one RCA output from your HU, it is usually meant to be used as a signal for a SUB only. If you want a true stereo input to your amp, use a line level converter (worth bugger all and easy to get hold of) to take the signal from your head unit speaker output, and use the RCA signal from the head unit to run your sub. Easy peasy!
Does this make sense?

[ascension24]

Okai, your Headunit has RCA outs correct.

Now, two plugs, left and right. This is Stereo.

You plug these RCAs into your amp.

Now depending on your amp, youll have different settings, maybe your amp has more then one input, this is something you'll have to work out, unless you really cant then post what amp you have and someone will work it out for you.

But back to the basics.
Now your amp has 4 channels, each channel has a Positive (+) and a negative (-)
So

ch 1 (+)(-)
ch 2 (+)(-)
ch 3 (+)(-)
ch 4 (+)(-)

You connect channel 1 to your left split, and your channel 2 to your right split.

Now your left with channel four and three, what normally happens is you connect the positive of say channel 3 and the negative of channel 4.

What this does is "bridge" channel 3 and 4. Roughly the power will be doubled and the ohm dropped in half (for technical reasons you dont really need to know), unless your running a special PG xenon amp which is same power at all ohms, but thats a special case.

Now yes, you will have and empty negative on channel 3 and a positive on channel 4, but if you hook something up to these, its like just using it as a 4 channel amp. Hence you dont get the extra power to run your sub.

So say its a 50wrms each channel amp.
Youll have

ch1 = 50watts
ch2 = 50 watts
ch3+ch4 (bridged together) = 100 watts

I hope i explained cleary enough for you to understand?

If not write back with any concerns, good luck.

[garfa]

umm... maybe i missed something but when did this become a bridging thread? not trying to sound patronising but i think i have missed something...
yes it can be used for a sub, but that doesnt mean its non-fading if theres only 1 preout.
and no 2 50W channels will not make 100W bridged it wil make more usually read 212volts tut.

[ascension24]

The main said he is looking at ways of running two speakers and a sub of a 4 channel amp.

That is how you run two speakers and a sub off a 4 channel amp.

The numbers there are for quick refrence, im not trying to quote specific amp details etc, so who cares if the numbers arnt exact because is besides the point. It shows that two channels bridged provide more power. So hanyze can understand what is happening.

[BerlinaBen]

[QUOTE=ascension24]Okai, your Headunit has RCA outs correct.

Now, two plugs, left and right. This is Stereo.

You plug these RCAs into your amp.

Now depending on your amp, youll have different settings, maybe your amp has more then one input, this is something you'll have to work out, unless you really cant then post what amp you have and someone will work it out for you.

But back to the basics.
Now your amp has 4 channels, each channel has a Positive (+) and a negative (-)
So

ch 1 (+)(-)
ch 2 (+)(-)
ch 3 (+)(-)
ch 4 (+)(-)

You connect channel 1 to your left split, and your channel 2 to your right split.....................................

QUOTE]

This is all right, EXCEPT, the original post says he only has one (single) RCA output from his Head unit not two. This means you have two options:
1) Split the signal from the one RCA into two with a cable and feed these into your amp. This will work but it will not give you true stereo sound. or...

2) Pull the signals for your amp from the left and right speaker outputs on the head unit, convert them to line level, and feed them to your amp. This will give you real "stereo" sound from your amp. You can then use the single RCA from your head unit to supply the signal to your two bridged channels on the amp for the sub. Hey presto!!! You now have real stereo sound and a decent amount of sub.


How to hook up the amp is pretty simple, once you sort out where your signals are coming from. Best bet is to read the instruction manual. (I know, it's normally the last resort, but not a bad idea!!)