I have a stock stereo unit. 2009 Honda Accord w/ NAVI. I got a new sound system installed and the speakers are great and loud but i can only control treble and bass and id like to be able to get the most of my system considering i spent 1700 dollars on the system. I know you need an aftermarket head unit to use an equalizer like the Clarion EQS746 which i wanted in the first place, but is there another alternative to get the most out of my speakers without upgrading to an aftermarket head unit? I like the stock one that it comes with.

 

a better eq than the EQS746 is recommended. the EQS746 requires RCA inputs.

an OEM integration processor like the JBL MS8 is a much better option.

you'll either want an EQ with high level inputs (to act as a LOC) like an Audio Control piece (EQL) or you'll have to use a LOC before the EQ.