What make and model is the headunit?

Hmmm ... the only info I can find on the internet seems to indicate that it doesn't have any line output's at all.  Therefore you would need amps with "high level" inputs.

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hey guys what do you think of this?? putting the 4 speakers off the standard headunit outputs, then going in series through this then to a 4x150W amp (600W) to my subs??

It say's it's a 2 channel device, meaning you would need two if you want to amp up your front and rear speakers. but for just the rear's you need one connected to the rear speaker output (which means you CANNOT have normal speakers connected to these wires as well) - and then run it into an amp which has another line output.

The wiring would go like this...
Rear speaker wires ---> RCA converter ---> Amplifier for rear speakers / sub with a line output (via RCA connections) ---> Amplifier for sub / speakers (whichever you didn't use in the previous amp).

I don't think so mate, but I'm not sure what the outputs from the RCA Convertor are.  If it has line outputs AND high-level outputs, then you would run the rear speaker signal directly into the RCA Convertor, then the high-level outputs to the unamplified rear speakers.  However, I don't think it does, so you will have to opt for permenantly amplified rear speakers if you wish to also run a sub off the system.

Here's a basic schematic for a stereo setup where the stereo has no line outputs, and you want amplified rear speakers and a subwoofer...
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But as I said, if you can get a sub amplifier or stereo amplifier with line outputs and high level inputs, then you won't need the RCA Convertor at all.  Unfortunately you can't run the rear audio signal to the unamplified rear speakers, then onto the RCA Convertor as this will strain or overload the amp in your headunit, as-well-as reduce sound quality.

Also, speaker earth's should NOT be wired to the chassis to make their earth, as you will get distortion in the sound signal.  The earth wire from the speaker must run back to the device supplying the live.

The stereo headunit all depends on how much you have to spend.  You can get Multimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or for £50 which aparently has a line output / input (it's probably a stereo RCA connection that can either be an input or output) - can't find many details on this make stereo on the net, so no idea what the sound quality is.

Multimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or by Mutant has two line outputs for £60, and Mutant is a known car audio manufacturer that makes stereos's, amps and speakers for those on a budget, upto those that have loads to spend.

There are many more, all going up in price ... so have a look and see what you think is best

GRRRRRRR why can this never go right for me??

got my tweeters and crossovers today and installation was going well(difficult due to my lack of spade connectors but no major faults) and then my passenger side pioneer component speaker started buzzing  so now i have a half installed tweeter set up, some subs but no amp, a headunit that can't support an amp, 2 working 6x9s and 1 working component speaker...

soo angry why does everything i try and do turn out sh*t