engine noise coming from equalizer

hello to the 12volt comunity.

I have some noise in my system that is killing me. first of all i have a pioneer deh-p3600 to a DHD preamp equalizer and from there to a kenwood amp. I have tried changing grounds on everything. my HU and EQ are grounded at the same location and they both share the same acc power, the EQ is right under my HU. I know for sure that it is not my amp or rca's. i think the noise is coming from my EQ because if i plug the rca's from the HU to the amp there is no noise. if i plug my EQ to the amps there is noise, even when the signal from the HU is not pluged in to the EQ. could it be because they are sharing the same power/ground. if so where else would i be able to get ACC power for the EQ so it wont be the same one as the HU.      Please help me

Thank you in advance to all who post and help me.