Your statement about the LOW END is confusing. If it is an APA-2100 with PowerGuard, its a decent SQ amp. Definitely not a low end.
However, in bridged mode, it wont give you more than 150W RMS. And thats LOW POWER for your sub even for SQ use.
Something capable of 200 to 275W will be required. The RMS of this subwoofer would be around 300W.