Equalizer
Other wise you would need to convert the output of the Monsoon to RCA's with PAC's then in to the EQ. From there, you would have to convert it back from RCA's to standard speaker cable. The level of output the EQ puts out might not be strong enough for the factory amp to pull off of to give you any real volume.
My suggestion is to put another receiver in as you will save yourself major headaches.

