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there are different signals going to each speaker from the oem amp. the jl summing device combines them to become a full range signal. so it takes the front tweeter and the front door and the rear doors and combines them internally to give you (for lack of a better word) a full range signal. once this has happened, this signal goes into the cleansweep to eliminate the factory eq curve. try this, go to your truck and turn the radio on. adjust the volume higher and you will notice that once you get past half volume, you start to lose sound frequencies. this is due to the oem system trying to protect the audio equipment in the truck. just about any aftermarket speaker that gets put in, can handle much more than the oem, so you are effectively reducing the output of the system. the cleansweep removes that, so you have a true full range signal going to your aftermarket amp.

---------- Post added at 01:09 PM ---------- Previous post was at 01:05 PM ----------

you can use use the cleansweep, or any other sound processor to retain the oem head unit and still get awesome sound