I've searched this forum and more...but I have a question I haven't seen an answer to yet. Hopefully someone can answer it or find it if they have stronger Google-Fu. I plan on doing an inconspicuous sound system in my 48. Speakers will be going either in custom door or kick panels in the front, and either in the panels beside the seat or the rear shelf in the back. 6.5" up front and either the same or 6x9 in the rear. I will probably hide a 10" sub in the trunk behind a hidden pannel and run a couple amps to push everything. I won't be using a head unit, I plan on running it off of a bluetooth adapter and using my phone. I've done very similar setups in jeeps, 4 wheelers, and RZR's and it works well. Here is my question. Without running a head unit, you have to rely on the phone for any adjustments for the trebble/bass in the music and they don't do a great job. Would it be worth doing a small equalizer between the bluetooth connection and the amp to be able to fine tune the sound quality? Has anyone tried it?