Hi so I just bought the new 2013 Zapco DC line 1004 and 1101. Only RCA and I have the SP4-SL eq that I was going to use based upon I have it in another vehicle, but stumbled upon the SP7-SL and purchased along with SLX-2 and was in search of the PSI power adapter when I found the SX-SL eq and before I do anything crazy I was looking for some feed back to as if its worth buying and what eq is actually the best. Thank You!

 

Your DC amps have EQ and all digital processing you could ever need onboard allready I wouldn't buy anymore EQ if I was you.