Which exact model amp? Kenwood makes a few different models which have different minimal ohm loads.
Those are dual 4 ohms subs which can wired to either a 2 ohm or 8 ohm load. From there you can wire them together (mono) into a 4 ohm load, or leave them separate (stereo) which may or may not be optimal for that amp.
My equipment list is
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. Playstation Network ID = jmii ...that's JM roman numeral 2