309 Custom Audio

309 Custom Audio Saturday and Sunday by appointment.
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Veteran-Owned

We specialize in:
🔊 Motorcycle Audio & Customization
🚗 Car Audio Systems
❄️ Remote Start Installations

From roaring bikes to clean car installs, we bring loud, clean sound and professional craftsmanship to every ride.

Today we remember and honor the men and women who made the ultimate sacrifice for our country.As a veteran-owned busines...
05/26/2026

Today we remember and honor the men and women who made the ultimate sacrifice for our country.

As a veteran-owned business, Memorial Day means a little more around here. Thank you to those who gave everything so we can enjoy the freedom to do what we love every day. 🇺🇸

We hope everyone has a safe weekend with family, friends, and plenty of miles on the road.

— 309 Custom Audio

A few people have asked lately why we’re booking a couple weeks out… and honestly, we couldn’t be more thankful. 🙌The an...
05/20/2026

A few people have asked lately why we’re booking a couple weeks out… and honestly, we couldn’t be more thankful. 🙌

The answer is simple… you guys keep us BUSY. Between Harley audio builds, custom installs, lighting upgrades, DSP tuning, powder coating, and fixing some “questionable” wiring from other shops… the schedule fills up quick. 😅

We’re beyond grateful that so many riders and customers trust 309 Custom Audio with their builds. It’s been incredible watching this shop continue to grow year after year. Veteran-owned, small town, and still chasing bigger goals every single day. 🇺🇸

If you’re thinking about getting on the schedule before riding season gets completely crazy, now’s the time to reach out. We promise the wait is worth it. 🔊🏍️

This 25 CVO ST is about to give a whole new meaning to lighting up the night. 😈🔥We knocked out a full lighting upgrade w...
05/14/2026

This 25 CVO ST is about to give a whole new meaning to lighting up the night. 😈🔥

We knocked out a full lighting upgrade with Shark Demon headlights and matching LED turn signals.

Pictures honestly don’t do this setup justice.

A lot of people think we only do audio around here…
but we’re doing lighting upgrades, suspension, maintance work, air ride, bars, gauges, and all kinds of custom work every week in the shop.

If it bolts onto a bike and makes it better, there’s a good chance we’re into it. 😂

Remember when upgrading your stereo meant a detachable faceplate and a trunk full of CDs? 😅Now this 1985 Dodge Diplomat ...
05/07/2026

Remember when upgrading your stereo meant a detachable faceplate and a trunk full of CDs? 😅

Now this 1985 Dodge Diplomat is sitting here with an Elite 9” touchscreen loaded with wireless Apple CarPlay & Android Auto.

Probably the only Diplomat around here mixing old-school class with this kind of modern tech.

There’s just something cool about keeping the classic body lines and vintage feel… while sneaking in the kind of technology we could only dream about back in the day.

No FM transmitter.
No cassette adapter.
No tangled aux cords.

Just hop in, fire it up, and cruise. 🇺🇸

Rethink.Elite

We’re gonna be closed Thursday & Friday this week.Back open after that and ready to get loud again 🔊If you need anything...
04/29/2026

We’re gonna be closed Thursday & Friday this week.

Back open after that and ready to get loud again 🔊

If you need anything, hit us up before or we’ll catch you when we’re back.

Appreciate all of you 🤝

At 309 Custom Audio, we’re big on working hand in hand with other local shops — because that’s where the best builds com...
04/24/2026

At 309 Custom Audio, we’re big on working hand in hand with other local shops — because that’s where the best builds come from.

We’ve always had a great relationship with Gardner’s Tint & Detail, LLC. and this is one of those times where he’s making a house call 👀

He’s out here experimenting with adding protection to a fender — not your everyday job, but exactly the kind of stuff that pushes builds to the next level.

When shops work together and aren’t afraid to try something new… that’s when the magic happens.

🏍️ Start the season RIGHT.This Road Glide came in for a full upgrade:✔️ Front & rear air ride✔️ Center stand install✔️ F...
04/16/2026

🏍️ Start the season RIGHT.

This Road Glide came in for a full upgrade:
✔️ Front & rear air ride
✔️ Center stand install
✔️ Fresh set of Dunlop American Elite 2 tires

Now it’s rolling out with brand new suspension AND tires—ready for a smooth, safe riding season.

Don’t wait until something fails… get your bike dialed in BEFORE the miles start stacking up.

📍 309 Custom Audio – Monmouth, IL
📞 309-368-7609

We do more than audio!!

Dunlop Motorcycle Tires
Dirtyworks LLC Dirty Air USA

Quit waiting… your system deserves better.We’ve got Cicada amps sitting on the shelf ready to go — 700.4, 700.4P, 1400.4...
04/14/2026

Quit waiting… your system deserves better.

We’ve got Cicada amps sitting on the shelf ready to go — 700.4, 700.4P, 1400.4, 1400.4P, and the beast 2500.1.

Pull up and let’s get you LOUD 🔊

Can't stop in? Don't worry, we can get one on the way to you.

04/10/2026

“It’s Friday… time to burn off the week 😤🔥
Smoke the stress, spin the tires, and let the weekend begin 💨

If it ain’t loud and sideways, you’re doing it wrong.”

Address

609 210th Avenue
Monmouth, IL
61462

Opening Hours

Monday 10am - 5pm
Tuesday 10am - 5pm
Wednesday 10am - 5pm
Thursday 10am - 5pm
Friday 10am - 5pm

Telephone

+13093687609

Website

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