equalizer preamp

So, I have a JVC KD S16 2.5volt Head Unit and a PPi 5440 amp and 15" PB sub. The only speaker powered by a amp is my Sub, and my door speakers are run by the HU. The system sounds decent and clear and pounds BUT i feel like it can sound clearer so i just ordered a Clarion Eq746 7volt to clear up...

Item(s) for Sale: Alpine EQ Preamp model 3331 component Item(s) Description/Condition: Untested due to component connections Still looks good , don't smell burnt , Price: $55.00 shipped Shipping and Miscellaneous Item Information: standard shipping by USPS Item Pictures: (List...