![]() I would caution you that you will doing your head unit no favors by using the JBL GTO938 and GTO638 drivers vs. ![]() I am first going to make sure that soundproofing my doors will not void the rust protection warranty of the vehicle. I will be keeping track of my work in this thread and provided updates of the install. These are high sensitivity speakers and should help with loudness. They cost me about 300$ more with 2 sets of dynamat extreme door kits. I chose JBL's: GTO18T tweeters, GTO938 6X9's for front doors and GTO638 6 1/2's for rear doors. Since i wasn't totally charmed with Bongiovi's device ( not saying that it's totally worthless either), i decided to add new speakers in the mix. Would i have been happier with a new head unit? Maybe, depending on the new unit's decoding capabilities and power rating, but i wanted to keep everything stock to the eye. The sound was improved bass is sharper, highs are clearer and there's a bit more power. I then decided to try this: I first bought the Bongiovi DPS module and had it installed at a cost of +/- 300$. I'll try to figure out what they are using are post my findings later on. I suspect that the factory speakers provide too much resistance for the HU, causing the heat. Great way to back up your product Toyota! I'll add that the Head unit becomes boiling hot when i play CDs. I should first say that i complained to the dealer AND to Toyota Canada about the poor sound quality of the base sound system in my 2013 HL plus and i was told that this is the way things are and that no help will be provided to me. Here's a short story of what i am currently doing to my 2013 Highlander's sound system:
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