CLS500 Aftermarket Amp for subs

[peedee]

Hello this is my first time posting. I recently bought a used CLS500 and am wanting to add my 2 12s and 1200 watt amp. I am told that the system is fiber optic and I shouldnt attempt to do this myself since there are no PREAMP outputs on the command center.

I do know that is possible. however I would like to know what the best apporach is. Should I use a sound processor? And if so, how should I go about connecting it to the OEM command center.

Thanks in advance.