Upgrading the LBZ Duramax with Kicker DS 6.5-Inch Door Speakers

Replacing the LBZ’s Front Door Speakers

You can live with a lot of things in an older truck—a little rattle here, a worn interior piece there, and even the occasional mystery noise—but a blown door speaker is not one of them. Once it goes, every song reminds you that it’s shot.

That’s exactly where we found ourselves—with a driver-side speaker that had officially checked out. So instead of just replacing it, we decided to make a small upgrade while we were there.

The goal was simple: keep it budget-friendly, keep it clean, and make it sound better than stock without turning the truck into a full audio build.

After a review of all of our options, we settled on a set of Kicker DS 6.5-inch coaxial speakers. At under $100 for the pair, they checked every box—affordable, good reputation, and designed to work well in factory-style installs without requiring amps or major system changes. After a quick order from our favorite online parts supplier and a day later, we cracked our knuckles and got to work on this install.

What This Kit Gets Right

The biggest win here is value. Now let’s be clear, we’re not talking cheap. These speakers deliver a noticeable improvement in clarity over worn-out factory units without requiring a full system overhaul. Highs are cleaner, mid-range is more defined, and the overall sound feels less strained, all at a price point that makes them palatable for any GMT800 owner.

They’re also built for real-world environments. The polypropylene woofer and durable surround handle temperature swings and moisture inside the door better than cheaper paper-cone options like the factory speakers.

Fitment is another advantage. Even though they’re larger than the factory speakers, the relatively low mounting depth makes them workable in tighter door spaces with a little creativity. The install is extremely straightforward, as you’ll see below, and the job is pretty simple overall.

And perhaps most importantly for this build, they don’t fight the factory Bose system. They won’t maximize its potential, but they play nicely with it, which is exactly what we wanted at this stage.

Getting Them Into the Truck

First things first, start by removing the door panel and unplugging the wiring harnesses so you can get clear access to the factory speaker. If you’re under 6 feet tall with a lifted truck, this will test every bit of your patience because you can’t reach the plugs and hold the door panel at the same time, but we promise you can do it.

With the panel off, remove the factory Bose speaker. In our case, it didn’t owe us anything. The driver-side unit was completely blown and, unbeknownst to us until this point, actually had a few tears in it. It was at this point that we realized that this upgrade was long overdue.

Once the speaker is out, you’re left with the factory mounting location, which is designed for the factory GM speaker. While this is technically a 6.5-inch speaker, in true GM style the OEM speakers have a smaller footprint with a 3-tab mounting style. No worries though, we’re eliminating that oddness right now.

To make the 6.5-inch speakers work requires a bit of effort on your part. Start by positioning the speaker over the opening and mark your mounting points. Make sure the speaker is centered over the hole and check for clearance behind it, especially for the window track and regulator.

From there, drill pilot holes into the inner door skin and secure the speaker using self-tapping screws. This method works well as long as the speaker sits flat and seals reasonably against the mounting surface. If there are gaps, a thin foam gasket or weather stripping can help improve the seal and prevent vibration.

Before final mounting, though, you’ll need to address the wiring. The factory Bose speakers use a plug that does not match the Kicker terminals. In our case, we cut the factory connector off and wired on the included terminal ends that come with the speakers.

Important note here: Make sure you identify the correct positive and negative wires. Polarity matters, and getting it wrong can lead to weak or inconsistent sound. If you’re unsure, reference a wire color chart for the truck before making connections. Google has tons of options that will walk you through this and ensure you get your wiring right the first time.

Once wired, connect the terminals to the speaker, secure the speaker in place, and double-check that everything is tight and not contacting anything inside the door. Before reinstalling the door panel, test the speaker. Play audio, listen for distortion, and confirm everything is working as it should. If it sounds clean, button everything back up.

Pro Tips and Things That Matter

Take your time positioning the speaker before drilling. Once those holes are in, you’re committed.

Check window clearance before final install. Make sure nothing interferes when the window cycles.

Use solid connections when wiring. Loose or poor crimps will cause problems later. When in doubt, give them the tug test before wrapping them up.

Always verify polarity before final assembly.

What You’ll Notice After

If your OEM door speakers are anything like ours, you’ll notice the difference immediately.

Where the factory speaker sounded blown and strained, the Kicker setup brings everything back to life. Music sounds clearer, vocals are more defined, and the system feels usable again at higher volumes. It’s not a full audio overhaul, but that wasn’t the goal here. It’s a clean, noticeable improvement that makes the truck more enjoyable to drive.

Why It Makes Sense

Not every upgrade needs to be complicated. Sometimes it’s about fixing what’s broken and making a smart improvement while you’re in there. These Kicker DS series speakers do exactly that. They restore function, improve sound, and fit the build without blowing the budget or turning into a multi-day project. For under $100, that’s hard to argue with.

Less distortion, better clarity, and one less thing in the truck that reminds you it’s getting older.