Thank you for your time and valuable reply. I did review the neutrik guide by searching other topics in this forum and now understand what needs to be done. I am yet to explore the onboard dsp features of the XTi2000 and will be happy to use them, but I had a question since I am using an external x-over, which is actually a Behringer EX1200. I use the sub out which is mono to feed signal to a CE2000 previously and now I am going to be using 1 Xti2000 for each sub instead. For this is it still ok to use y xlr splitter to convert 1 mono in to two mono signals that I can feed in to the Xti2000. I will then link the signal out from 1 Xti2000 to the other. Is this correct way to do it ? I havent tried out the amps as yet but you can bet I am looking forward to it. I have just ordered my 4 pin speakon to be changed on the speaker cable only at the amp end of the wire.