Hello eaglepower_2,
Well, to get the maximum power from the amp, you really need a 2ω load. Unfortunately, you cannot get that from 2 L5's with 4ω voice coils. You can get either 1ω which will burn your amp up, or you can get 4ω, and your amp will put about 500 watts RMS into that load.
To get the most from your amp, you really needed the L5's with 2ω voice coils. That way, you could run the voice coils in series and the subs in parallel, resulting in a 2ω load, exactly what your amp likes. If you can exchange them for the 2ω model, I would.
Here's the link to Kicker's manual for the ZX-1000.
http://www.kicker.com/sites/default/files/2008%20ZX%201000%201500%202500-1%20e01%20web.pdf
Hope this helps.
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