System OK? Opinions?

That amp isn't gonna be any good for those subs.  It's not going to be able to power them very well.Don't Ask Questions When You Already Know The Answer!!!

hey i dont suggest either one of those brands

I agree, those subs aren't too bad but that amp doesn't even come close to being able to power them.  You have to keep in mind that the "500 Watts" that amp claims to push is a max rating for all the channels combined and means almost nothing it's just the power it can supply for a short period in quick bursts.  You need to look at RMS numbers (or Nominal rating) and in the case of that amp, they don't come close to matching the RMS of the subs (which is 400 Watts).  You want to try and match the RMS wattage on the sub with the RMS output on the amp.  The other issue is that the amp is a 4 channel and it looks like the max RMS you're going to get is 120W to each sub.  Underpowering subs can be just as dangerous as overpowering them.  My reccomendation would be to head to any audio shop in your area and tell them the subs you have and that they are 400W RMS and see what they reccomend for an amp.  You don't have to buy if from them, it'll just give you a better idea what to look for.  Those subs would probably pound pretty well with the right amp, but it'll need to be a heck of a lot more powerfull and if you can help it, stay away from Sony products all together for car audio.

thankx for all your help  i think the general consensus is to get rid of the amp but keep the subs..thanks for ur help ..i'll go have a look for a suitable amp It's all about bass

Look for a good quality class d mono amp that will produce between 600 - 800 watts RMS @ 2 ohms. Then you're going to want to wire your subs like so: Also, your box(es) are going to be a very important factor. The box can make or break the system, so make sure you read the manual on those subs for the recommended box.

Well listen to the subs before you buy them, that is a matter of opinion but that amp simply does not produce enough power to run those subs.

are these any good? http://www.jaycar.com.au/productView.asp?ID=AA0428&CAtid=&keywords=amplifier&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=It's all about bass