The Blackforge
Iron Kit
Featuring Polk Audio Drivers & Kenwood Amplification
Value-Driven Professional
The Blackforge Iron Kit is built for riders who want clean, reliable audio without breaking the bank. Kenwood's all-in-one amp with integrated Bluetooth eliminates the need for a separate controller, and Polk Audio's marine-certified 4" drivers deliver crisp, balanced sound at highway speeds.
Built-In Bluetooth 5.0
aptX streaming directly from the amp. No separate controller or head unit needed.
IP67 Waterproof Amp
Ride through rain, mud, and road spray. Marine-grade construction inside and out.
All-In-One Brain
Kenwood's integrated design saves you the cost of a separate Bluetooth controller.
Universal Bar Mount
Clamps securely to 7/8" up to 1.25" bars. Fits sport bikes, cruisers, and standards.
Blackforge Acoustic Lining
Proprietary internal acoustic dampening material absorbs cabinet resonance and road vibration, giving you tighter bass and clearer mids at highway speeds.
Technical Details
What Drives the Iron
Amplifier
The Brain of the System
- Model
- Kenwood KAC-M5024BT
- Power
- 50W RMS x 4 @ 4Ω
- Bridged
- 150W x 2 @ 4Ω
- SNR
- 89dB (Rated) / 74dB (1W ref)
- THD
- < 0.05% at rated power
- Bluetooth
- 5.0 with aptX
- Water Rating
- IP67 / IP66
Speakers
What You Actually Hear
- Model
- Polk Audio DB402
- Size
- 4" Coaxial
- Power
- 45W RMS / 135W Peak
- Sensitivity
- 90dB @ 1W / 1m
- Cone
- Polypropylene UV-Tolerant
- Water Rating
- IP65 Marine Certified
Why These Parts
Built-In Bluetooth.
Built for the Road.
The Blackforge Iron Kit starts with the Kenwood KAC-M5024BT — chosen because it is one of the few amplifiers on the market that integrates Bluetooth 5.0 with aptX directly into the amp itself. That means you do not need a separate head unit, controller, or relay box. Just pair your phone and ride.
Polk Audio's DB402 speakers are IP65 marine certified with polypropylene UV-tolerant cones, built to take sun exposure and road vibration without degrading. At 90dB sensitivity, they deliver real volume from the Kenwood's 50W channels without demanding more power than the amp can deliver.
Universal Engineering
Perfectly Paired
90dB+ Sensitivity
The Polk DB402 hits 90dB at 1W. On a motorcycle, every 3dB is like doubling your power. These speakers are designed to be loud without needing a nuclear reactor to drive them.
Low Noise Floor
The Kenwood KAC-M5024BT delivers an 89dB SNR at rated power and 74dB ref 1W. When the bike is idling, you won't hear that annoying hiss common in cheap motorcycle amps.
4-Channel Future-Proof
Because the Kenwood is a 4-channel amp, adding Secondary Strike kits — bag lid speakers or lower fairing pods — is a simple plug-in upgrade. You're buying the brain for a 4-speaker system today, even if you start with two.
Blackforge Iron Strike
Add a second pair of Polk Audio DB402 speakers in your bag lids or lower fairing pods. Your Kenwood amp already has two unused channels waiting. Pre-wired, waterproof connectors — just plug in and double your sound.
The Blackforge 5-Year Promise
Integrity Guarantee. Performance Guarantee. And our "Rider's Policy" — if a part is discontinued, we upgrade you. Every Iron, Obsidian, and Damascus system ships with our industry-leading warranty. No fine print.
Read Full WarrantyReady to Hear the Road?
The Blackforge Iron Kit. MSRP: $1,049.00. No fairing required. No permanent mods. Just clean audio that fits your bars.
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