If you look on the first page
Digital 4 Channel MOSFET Amplifier - DA10004D
www.dualav.com
manual, and then go to page 10, you will see it is 240w x 2 (bridged), (unknown Ohms), but page 8 tells you it is 4 ohms. This doesn't seem right, and neither does their wiring.
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Here is how you wire the amp.
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You're going to want to use the two kickers, and you're going to be a little light of what they can do at RMS.
I didn't notice any THD rating on there, and dual is a known budget brand. Not sure if you have a way to detect clipping, but you could use this method:
and you'll want to dial the amp into anywhere from 240-300w.