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thanks guys.. SO what is the best option, if i plan on possibly powering another sub in the future... ?? I just cant figure out how such a powerful amp is so cheap.. So basically your saying there is no subsonic filter, so there is no frequency limit on the low end?? how about low pass?? does it cut off at some point, like most other sub amps, like 500 hz -250hz, etc?
If you're planning for a possible addition later, you could go either way, but if you need more than 2x500w, then I think you should go pro-amp. Those amps are built for different duty, so it's cheaper, but lots of folks use them for home use. The drawbacks are weight, lack of features (usually no hpf or instant turnon, and possibly fan noise. Pro amps will amplify any freq range you supply it. Plate amps have their purpose, they're lighter, can be installed in the box, and often have filters built into it. Did I mention lighter? You'll probably pay a bit more per watt for a plate amp compared to basic pro amp of similar power, especially at the higher range, say, over 500w. I needed a hpf for my ported sub along with add'l gain for the signal between the receiver and pro amp, you might or might not. A plate amp is the easiest to do without reading up on all of the connections, etc with a pro amp, as you can tell.

You're right on with the hpf- protection for vented from nasty low end sound sometimes on soundtracks, but if you go sealed, the design affords the protection. Most people seem to use the built in lpf in the receiver to the sub amp, which is typically set around 80hz, so you should have that covered...
 
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