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That 700 watts is maximum peak power, not RMS. If you're looking to not spend a lot of money for an amp, but want something that sends enough power to the Performance Teknique's, I'd recommend a 2-channel like the Boss Diablo D400.2. It's plently powerful enough and if you change out later, the amp can be bridged. And for inexpensive, it's got a lot of nice features, including a remote level control. It's 2ohm stable in stereo. Nice, for under $70.
The simple answer is that a subsonic filter prevents frequencies below the threshold of hearing, hence subsonic, from being sent to the subwoofer. Such frequencies result in a loss of available amp power and in the extreme can even damage the speaker.
Look into competition lines of different manufacturers.... Massive Audio DMX, Soundstream, Atomic APX, Incriminator Audio Death Penalty Series, Kicker Solo X etc. In car audio, you have to pay to play. Dont expect a 100.00 subwoofer to take 2000W continuously.
Massive Audio offers a no questions asked warranty. Even covers blown voicecoils!
This sounds like a gain setting problem on your amp. The best way to adjust is to set your volume on the head unit to about 75% volume and then adjust the gain up until it sounds distorted a little. Back it off jst enough for the distortion to go away and you are set. Only other thing to try is use a multimeter set on Ohms to test the resistance of your speaker configuration. Looks like 2000 is th peak power (not RMS) and is only possible at high current configurations. You are probably running at 4 Ohms, but this amp only puts out rated power at 1 ohm stereo or 2 ohm bridged. Many people say Performance Technique are overrated, so maybe not even what it is rated at - 350 x 2 @ 2 ohms bridged (probably only about 175 x 2 at 4 ohms bridged)