Purchase the Rockford Fosgate Punch speakers P1675-S and P1675 for the H3 & H3T Hummer to get the best combination of an inexpensive price and improved sound quality. For the H3 Hummers with the Monsoon Sound System, purchase the Rockford Fosgate P3SD2-8 to replace the factory dual coil 8-inch subwoofer. Also, 2 packs of the Metra 72-4568 speaker harness adapters for GM vehicles are necessary to connect the door speakers without cutting the into the vehicle’s wires.
![](https://i0.wp.com/schwarttzy.com/wp-content/uploads/2020/12/Schwarttzy-Hummer-H3-Rockford-Fosgate-Punch-P1675.jpg?resize=1024%2C768&ssl=1)
The pair of P1675-S Punch Speakers work the best upfront because it is a mid-range speaker with a separate tweeter for the highs. H3 & H3T Hummers have the front speakers working in combination with the OEM-equipped tweeters. To ensure that the proper frequency is being sent correctly to the speaker the speakers up front need to be mid-range. While the package does include the better quality tweeters, I have yet to install them.
![](https://i0.wp.com/schwarttzy.com/wp-content/uploads/2020/12/H3-Hummer-P1675-S-Punch-Speaker-Rockford-Fosgate-Schwarttzy-Upgrade.jpg?resize=1024%2C576&ssl=1)
In the rear of the Hummer, there are no tweeters associated with those speakers. This is why the full-range P1675 speakers should be installed in the rear doors. If Rockford Fosgate isn’t your brand, the front and rear door speakers are 6.75-inch in diameter. Make sure to grab one set of Midrange and one set of Fullrange for the best results.
![](https://i0.wp.com/schwarttzy.com/wp-content/uploads/2020/12/H3-Hummer-Schwarttzy-Subwoofer-Rockford-Fosgate-Upgrade-P3SD2-8.jpg?resize=1024%2C576&ssl=1)
The Rockford Fosgate P3SD2-8 8-inch dual coil subwoofer is a very specific choice because of the OEM speaker. While typical subwoofers have a single voice coil, dual voice coil (DVC) subwoofers use two separate voice coils, each with its own connections, mounted on one cylinder, connected to a common cone. Since the P3SD2-8 is a dual coil subwoofer this makes it very easy to swap into the factory location. I’m not aware of wiring harnesses out there, I decided to desolder the connections from the factory subwoofer and transfer the wire over to the new sub by resoldering those wires. This is the simplest solution I’ve figured out.
![](https://i1.wp.com/schwarttzy.com/wp-content/uploads/2020/12/H3-Hummer-door-panel-lock-and-open-cable-speaker-install-scaled.jpg?ssl=1)
![](https://i2.wp.com/schwarttzy.com/wp-content/uploads/2020/12/H3-Hummer-Rockford-Fosgate-6.75-inch-speaker-H3-H3T-Hummer-scaled.jpg?ssl=1)
![](https://i0.wp.com/schwarttzy.com/wp-content/uploads/2020/12/H3-Hummer-Speaker-Install-scaled.jpg?ssl=1)
![](https://i1.wp.com/schwarttzy.com/wp-content/uploads/2020/12/H3-Hummer-Subwoofer-factory-enclosure-upgrade-scaled.jpg?ssl=1)
![](https://i1.wp.com/schwarttzy.com/wp-content/uploads/2020/12/Speaker-install-torx-bit-H3-Hummer-Schwarttzy-scaled.jpg?ssl=1)
Overall, this is a quick upgrade to the sound system that will vastly improve the sound quality in an H3 and H3T Hummer.
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