Rubber bridges are all the rage. By most accounts, the first rubber bridges began popping up in the early 2000s after Reuben Cox noticed a modified banjo with a wood and metal wedge beneath the strings. The result was a muted but clear sound.
It wasn’t long before Cox introduced this concept into his own guitar shop, creating a style of guitar that would eventually be adopted by artists including Bob Dylan, Wilco, and Phoebe Bridgers.
The sound reached its commercial zenith on Taylor Swift’s Folklore, which was produced by The National’s Aaron Dessner, and Cox’s instruments have even become the subject of a documentary film, Really Good Rejects.
What is a rubber bridge guitar?
Like the name suggests, a rubber bridge guitar utilizes a piece of rubber to muffle the guitar strings without completely suffocating them.
On most guitars, this modification requires replacing the standard bridge and saddle with a rubber system and a tailpiece. The result is a folk-style, banjo-like sound.
The cleanest DIY rubber bridge
One common problem that artists encounter while installing rubber bridges is reduced projection. Rubber bridges naturally create a muted sound. But, without the appropriate hardware, the sound can be difficult to project to audiences during performances.
One of the best ways to solve this issue is by installing a high-output pickup in either an acoustic or electric guitar in addition to the rubber bridge. The increased sensitivity of the pickup allows you to project the muted sound more effectively. The winning combination is typically a hot-output pickup with a piezo mic.
In an interview with Reverb (opens in new tab), Cox acknowledged that artists have been attempting to produce the muted sound of a rubber bridge for decades.
"I certainly didn't invent it. People have been using foam, tape, string, anything to get that sound," he said. "You hear it on a lot of songs, especially from the '60s because of the Fender Jaguars and Gretsches that had a flip-up mute.
"Anyway, the vibe is the rubber bridge which mutes it, flatwound strings which are dark as well, and then you counteract that with a shredder pickup, basically so there's some clarity. That seems to be the combo."
But Cox's rubber bridge system continues to appear in popular music today because it works.
Basic rubber bridge installation
If you’re not interested in purchasing a customized rubber bridge guitar, or you’d prefer to complete the modification yourself, you can typically purchase the basic components for about $50. But as a relatively obscure modification, it’s pretty difficult to find kits for this purpose.
The permanent modification for a rubber bridge guitar would involve ordering a customized rubber saddle or creating your own with a hardened piece of rubber. And you’ll need a tailpiece, as well.
Experimental DIY rubber bridges
If you only have one guitar or you don’t want to fully commit to permanent modifications, there are some minor changes you can make to achieve the muted rubber bridge sound.
One strategy that artists are using to create this sound is to replace the guitar’s existing saddle with one they’ve made out of hardened rubber before restringing their guitar like a standard acoustic.
The key to this approach is to create shallow slots for the strings to ensure that they still ring out. The problem with this strategy is that, if the rubber is too soft, the strings will likely cut through the rubber over time, which makes it a temporary solution. But switching to a set of light strings may help to reduce their impact on the rubber.
Some artists are also placing a thin layer of rubber on top of the existing saddle. This strategy will create the desired muted sound, but it will also give your guitar higher action. You could sand the bottom of the saddle down to address this issue. Over time, the rubber strip may need to be replaced, as well.
If your strings aren’t quite as muted as desired, cut deeper grooves into the rubber. The goal is to create a slightly dead sound in the strings.
Creating the rubber bridge sound with no modifications
Like Cox indicated, guitarists have been making minor modifications to their instruments for decades to achieve a muted sound. And you don’t necessarily have to make major adjustments to accomplish that goal.
Today, you can make or buy a mute pad from Etsy (opens in new tab) that exists for the same purpose. The perk of having this tool is that it can quickly be engaged or removed. But it may produce results with less clarity than a standard installation.
You could also thread a thin piece of rubber through your strings, or place a thick piece of rubber next to the saddle to get the same effect, as you can see above.
This is the quickest and easiest way to approximate the sound of Cox’s designs – and a great way to test the waters if you’re considering investing in the real deal further down the line.