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Sub Processors, Pro Plate Amps?

I'm looking at adding a sub to a full range PA setup. Our powered board has a sub-out, so I need to know if there are sub signal processors? Are they even necessary? I've also seen plate sub amps. Does anyone make pro grade plates? These plates appear to have some mixing, phase control, x-over freq, etc. Just no pro connectors, or other features.And some of these plates can't run at full duty cycle ( some stated 30% duty cycle !). Any thoughts?
 
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These guys make this very flexible one for $275
Or they have high powered expensive ones.
You can program the DSP for your needs

But, a Power amp with DSP can be found just a cheap these days. And are very light.

Signal Processing like Waves MaxxBass actually involves the mids also to enhance the bass. The only power amps with MaxxBass in the DSP are the Crown and Peavey DSP models.