The dB651 and DXi651 both have 92 dB SPL sensitivity while the dB651 and DXi691 units have 93 dB sensitivity. On the 4 ohms Polk Audio speakers there is a dB series and a DXi series but the specs seem to be the same for each model in the line. Neither of these vehicle have the DPS box that you have in your vehicle. Both cars were the 6 speaker base equipped audio systems. Both cars got the Dynamat treatment for these doors. I upgraded both my 2008 Highlander Sport SUV and my 2010 Venza with Polk Audio dB651 (rears) and dB691 (fronts). As you plan, I used the original 6x9 speakers as mounting brackets for the new speakers and applied Dynamat to the door cavity and around the speakers. My amps thank me everyday and I'm satisfied with the sound quality. I chose to replace my OEM speakers in my HL with Polk Audio dBx speakers which are nominal 4 ohms and are within a dB or so of the rated sensitivity specs of the JBL drivers you have selected. Higher impedance speakers draw less current from your amps while lower impedance speakers will draw more current from the amps. I would be very careful turning your system too loud as you may kill the amps while distortion can burn out the speakers. Hence, you may overdrive the amps and distort the sound. When you use 2 ohms drivers when you install the JBL's, you will be asking your amps to effectively supply twice their current for a 2 ohms load vs. The factory amplifiers are clearly designed (and expecting) to drive a 4 ohms load. My 2008 Highlander Sport OEM speakers were 4 ohms nominal impedance. If your OEM speakers are already causing your head unit to run hot, you will likely increase the heat to be dissipated if you use the JBL drivers. The JBL speakers are 2 ohms nominal impedance which enables a slightly higher sensitivity to be spec'ed. 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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