A motorcycle doesn't have a dash cutout sized for a head unit, most aftermarket setups build around the blank switch panels bikes actually have. Here's a complete, priced motorcycle stereo system built around that real constraint, a receiver that mounts into a standard switch knockout, handlebar speakers, and an amp sized for a motorcycle's smaller electrical system.
What's In This System
| Part | Role | Price |
|---|---|---|
| Kicker 51KBTR Bluetooth Receiver | Source unit, mounts into a standard 2"x1.4" switch knockout | $169.99 |
| Kicker PSM 3" Handlebar Speakers (Pair) | Clamps directly to the handlebar, no fabrication | $199.99 |
| Kicker KPX300.4 4-Channel Amplifier | Drives both speakers now, sized for a motorcycle's electrical system | $299.99 |
| Total | $669.97 |
Key Takeaways
- The 51KBTR mounts into a standard 2"x1.4" switch knockout, a real fitment detail for bikes with blank switch panels rather than a dash bay.
- No built-in amp on the 51KBTR, it's a preamp source only, which is exactly why this build includes a separate amp rather than relying on the receiver alone.
- The PSM's 50W RMS rating and the KPX300.4's 45W RMS per channel at 4-ohm are a close match, real headroom without wasting the amp's output.
- The 51KBTR carries an IP66 rating, genuine protection for a receiver mounted in the open on a bike.
- Only 2 of the KPX300.4's 4 channels are used here, room for a second speaker pair later without replacing the amp.
Why the Switch Knockout Detail Matters
Most motorcycles ship with a handful of blank switch panel cutouts already built into the fairing or dash, sized for aftermarket accessories, not a car-style head unit bay. The 51KBTR is built specifically to drop into a standard 2"x1.4" knockout, which means no fabrication for the source unit itself, only the speaker and amp mounting need real installation work.
Feature Walkthrough
Source: Kicker 51KBTR
Bluetooth receiver with a 100Hz low-pass subwoofer RCA output, IP66-rated, mounts into a standard switch knockout. No built-in amplifier, preamp output only.
Speakers: Kicker PSM
3" driver, 50W RMS (100W peak) per speaker, cast-aluminum single-point handlebar clamp, no drilling or fabrication.
Amplifier: Kicker KPX300.4
4-channel, 45W RMS per channel at 4-ohm, built specifically to avoid overtaxing a motorcycle's smaller charging system rather than adapting a car or marine amp to the job.
What This System Doesn't Include
No subwoofer, a motorcycle's handlebar-speaker setup isn't built around bass output, and the 51KBTR's sub RCA output is included for a future addition, not a requirement. This is priced as a complete 2-speaker system with the receiver and amp, not a maximum-output build.
Who This System Is For
Choose this build if your motorcycle has a blank switch panel to mount a receiver into and a handlebar to clamp speakers to. It's not the right build if you want more than 2 speakers from day one or need bass output beyond what handlebar speakers can deliver, plan a subwoofer as a separate future addition using the 51KBTR's sub output.
Honest Cons
No built-in amp on the receiver means this system genuinely needs all three parts, it's not a simpler 2-piece system.
45W RMS per channel leaves headroom unused against the PSM's 50W RMS rating, intentional here for electrical-system safety on a smaller vehicle.
The switch knockout mount assumes your specific bike has one sized correctly, confirm your dash or fairing's actual panel cutouts before ordering.
Frequently Asked Questions
Does the 51KBTR have a built-in amplifier?
No, it's a preamp source unit only. A separate amp, like the KPX300.4 in this build, is required to actually power speakers.
Will the 51KBTR fit my specific motorcycle?
It's built for a standard 2"x1.4" switch knockout, common across many motorcycles, ATVs, and UTVs. Confirm your bike's actual panel cutouts before ordering.
Can I add a subwoofer later?
Yes, the 51KBTR includes a 100Hz low-pass subwoofer RCA output specifically for that future addition.
Bottom Line
For $669.97, this system solves a motorcycle's real mounting constraints, a switch knockout receiver, a handlebar speaker clamp, and an amp sized for the bike's electrical system, not adapted from a car or boat.