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I could make sure that both of GXD4 and GXD8 are having DSP. The power rating GXD4 for me is closer to the program power on the top of my loudspeaker, and the GXD8 is closer to the subs program power rating. These two are nice choices and the prices are reasonable. I am wondering of these both two would be really perfect for speaker that i bought from seeing this one.