Flexiblity for use with most any system. Plenty of power great cross over set up and great controls.

Have not seen any, other than they are so flexible it takes some time to set it up properly.

This sub is incredible! Tight deep bass without boom and plenty of power and adjustability to make it a great component with any receiver. Flexible hook ups Works great with the Quintet III's from Kilipsh. Cross over is perfectly matched and allows the Quinet III's to show there stuff, with out trying to push all the bass out if they are used alone. you need to hear this sub to believe it. It will shake the house.

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Non powered Radio Shack sub before on same amp this one blows it away.

Simply phenominal. Once I connected the system and cranked it half-way, the pictures began to fall off the walls. Naturally, Klipsch.