wire clarion amp and subwoofer?

Hi, so I just bought myself i new subwoofer clarion 1251 ( http://www.clarion.com/ca/fr/products/2009/audio/subwoofers/PXW1251/ca-fr-product-pf_1172413277164.html) and a new amp apx1300 ( http://www.clarion.com/us/en/products/2006/audio/amplifiers/APX1300/us-en-product-pf_1134643389055.html). And i dont know how to wire them to get as much power as I can. Anyone can teach me how to do that plz. Thank you!

That amplifier is only stable down to 2 ohms. You will need to wire the subwoofer in series in order to make a 4 ohm load for that amp.

and should I go with a bigger amp or that one is enought?

The amp you have will be slightly under powering that speaker. With that being said the amp you have should be fine as you wouldent notice much of a difference if you got a bigger amp. That speaker is rated for 500 RMS and it will be seeing 300 RMS. The subwoofer is dual 2 ohm coils. So the wiring options you have are either 1 ohm or 4 ohms. You have to run your speaker at a 4 ohm load because your amp is not stable at a 1 ohm load. Follow the diagram option 2 that i am an idiot has posted. Then measure the resistance with a dmm to make sure you wired it correctly. If wired correctly you should get a reading close to 4 ohms.

According to the Specs you posted, the amp will produce 300 watts into a 4 ohm load. It will produce 400 watts into a 2 ohm load. Your only choice is 4 ohms. It will put out 300 watts. So as stated earlier, I too think that the 500 watt woofer will be slightly underpowered. EDIT: I wrote this after only reading the part of Ragsports saying it was underpowered. Then I went back and read his post. So I guess the So as stated earlier should have been at the very beginning of my post. Sorry

Isn't it a difference between 500rms at 4ohm and 500rms at 1ohm? Are you sure my sub can handle 500rms at 4ohm? (Maybe ill buy another amp)

Your speaker can handle 250 watts per voice coil. It has no Idea how you wire it up. You do not need to buy a new amp, at least play it and see if it does what you want it to do. It is not a crime to underpower a speaker. It may be a Sin, but not a crime.