Car Stereos: Car amp for my 6x9 speakersto be powered of a seperate channel, citreon saxo, subwoofer amplifiers

Question

My head unit Hi mate hope you can help.

I have a 400w amp and sub box set that is working well.  However i have some 6x9's attatched to that amp so not only am i getting bass out the sub box, i'm also getting it out the 6x9' which is good in a sensem however its for too much!! some songs the trebble crackles cos of the bass.  Im wanting to run the 6x9's on a seperate channel to the sub box amp as ive tried changing the gain and everything and nothing solves it.  im thinking of getting a seperate amp, connecting it to additional RCA connections on the back of my head unit and then wiring the 6x9's to that.  Meaning i get trebble ONLY from the 6x9's and leave the sub box for the bass like its suppose to do.

iv tried connecting the speakers to my back seat speakers however shorted the cable in the process, however the 6x9's still work.

ill give you these peces of infomation as it may help you out, the first link is to a pic of the wireing diagram for my headunit and the second link is ofthe actual 6x9 speakers so you know how powerfull.

So my question to you is that ok to do and if so what amp should i get? or if not what should i do?

Ohhh also if it helps iv got a Citreon saxo 1.1 forte W reg


Heres the two links:

link 1:

http://www.maplin.co.uk/Module.aspx?ModuleNo=37987

Link 2:

http://i585.photobucket.com/albums/ss293/morgiee_2009/myheadunitdiagram.jpg

Thanks mate

Answer
Hi Daniel,

I agree that your best option is to purchase a dedicated amplifier for the 6x9" speakers.  From the diagram, it looks fairly straightforward, as your head unit includes separate RCA outputs for front, rear, and subwoofer amplifiers.  

The speaker manufacturer doesn't specify an RMS power rating for the speakers, but I'd guess that you would do well with a 2-channel amplifier rated around 50 watts per channel at 4 ohms.  Most amplifiers will include a built-in crossover so that you can remove the deep bass tones from the amplifier output.  You might want to consider purchasing a 4-channel amplifier instead of a 2-channel, so that you're ready if you decide to upgrade your front speakers.

I'm not very familiar with the amplifiers that are available in the UK, so I can't make a recommendation.  However, I took a look at the "In-car amplifiers and capacitors" link on the same page you sent for your speakers.  I noticed a "2x100w" amp and a 4x100w" amplifier listed there; both listed a continuous power rating (RMS) of 50 watts per channel, so I think either should do fairly well (though I'm not familiar with the brand name).  

Hope this helps!

Brian