what will componets do?

ok so my brother has 4 coax all around 6 1/2 pioneer;s

powered by a 45x4 panosonic deck....

if we install componets +tweeter

what is the diff?

will it be more crips sound?hit more?

i guess what i really meant to ask is what does componets+tweetres do compare to coax

the componets will be placed in the front

Some components allow the user to mount the tweeter in the middle of the woofer and become a coax like point source.  I think a huge benefit of (decent) component speaker systems that hasn't been mentioned yet is the improved quality of the crossover.  A nice clean, calculated, and normally steeper slope of a component crossover helps components get that clear, strong sound that (the good components) are known for while increasing the power handling capability. 

Having said that, if you want to stick to head unit power, which is probably more like 15ish rms x 4 you might be better off staying with the coax set.  Generally components need more power to make them sound good.  So, might be tempted to turn your head unit up higher to get the volume you want.  The head unit might clip and you would then introduce distortion to the components.  This distortion would be ugly to listen to and damage your new components. 

If you're really curious, then go to your local shop that carries coax speakers close to yours and demo some quality components compared to your speakers.  Tell them not to run either set off amplifier power (unless you plan on buying an amplifier) and listen to the difference yourself.  You might decide the difference is not worth it.  Or you might decide that it is. :-)

wow alot of info thansk all

thje deck is

25 watts RMS/50 peak x 4 channels

I think this page says it best:  "The power output from a high power head unit is limited (by battery voltage) to approximately 20 watts per 4 ohm speaker. All of the manufacturers that say their head units can produce 30 or more watts of real power are... how can I say this? Hmmm... Full of it!"

http://www.bcae1.com/headunit.htm

Anyway, one reason to consider buying and amplifier if you do decide to upgrade to components. 

Very well said.  I personally feel the bigest difference between the two is the crossover used.  In most coaxials (not all mind you), you are stuck with a small capacitor (1'st order filter).  With components, you get a crossover better suited for the design, which will make it sound much better. 

Having said that, what I recomend is first adding an amplifier to your front speakers.  This will clean up the sound greatly.  You might be surprised at how much better your speakers sound with cleaner power, and that's becide the fact that they can get louder.  This will also prepare you to upgrade to components.  I've never had luck running components on head units.  They just don't have the power needed.

Steven Kephart

Adire Audio