Model HK9-Slimline: Universal "Demon™" Triple Steel Train Horns / Onboard Air System
KL HK9-Slimline
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Model 730: The Demon™ Triple Steel Train Horns
The Undisputed King of the Road
When the situation demands more than just a loud horn, the Demon 730 stainless steel horns dominate the road! Delivering a sonic roar that cuts through sirens, heavy machinery, and chaotic traffic, these precision tuned steel horns are the ultimate train horn solution. Engineered to move massive volumes of air, the 730 provides the deep, earth-shaking rumble of an authentic 40,000-lb locomotive.
XCR 2.0™ Extreme Durability
Featuring our signature XCR 2.0™ salt-spray resistant coating, the Demon 730 thrives in the harshest environments. Whether faced with coastal salt air or off-road mud, these horns are built to maintain their professional-grade finish and startling output for the long haul. The stainless steel construction ensures that the internal components won't succumb to the corrosion that destroys lesser horns.
Modular Mounting Flexibility
While the Demon 730 comes mounted on a heavy-duty flat rack, it offers maximum installation flexibility. Each individual trumpet can be removed from the rack and mounted separately to accommodate even the tightest installation requirements on trucks, SUVs, or Jeeps. This modular architecture allows you to tuck the massive 6" to 7" bells into locations where a fixed-rack system simply won't fit.
why choose the "Demon" 730 horns?
- Unmatched Volume & Airflow: The undisputed crown jewel of the Kleinn lineup and our loudest stainless-steel triple train horn.
- Heavy-Duty Construction: Built with precision-tuned stainless steel trumpets for the most aggressive locomotive roar available.
- All-Weather Reliability: Signature XCR 2.0™ black coating provides extreme salt-spray and corrosion resistance.
- High-Flow Solenoid: Pre-fitted with a professional-grade VX6003 heavy-duty brass solenoid for instantaneous response and maximum decibel output.
- Universal Integration: Designed to work with any high-pressure air system (150 PSI recommended) to command immediate attention.
- Modular Architecture: Detachable horns allow for custom mounting configurations tailored to your specific vehicle chassis.
the Undisputed King of the Road!
THE VERDICT: Designed specifically for those who want to dominate the road, the 730 Demon™ is your weapon of choice. It stands as the largest and loudest train horn in the Kleinn arsenal.
WHAT'S IN THE BOX?
- (730) The Demon™ stainless steel triple train horns: Precision-tuned trumpets on a detachable flat rack.
- (VX6003) High performance air solenoid valve: Pre-installed 1/2" NPT heavy-duty brass air valve.
- (Fitting) 1/2" Airline Connector: Compression fitting for high-flow air delivery.
- Installation Hardware: Heavy-duty mounting bolts and high-strength fasteners.
BOOST YOUR BLAST: 30% MORE OUTPUT
Unleash the full fury of your Demon™ 730 Train Horns!
Experience the Demon™ 730 Horns in all their glory! The Ultra BlastMaster™ (6890) re-engineers your system’s architecture, maximizing airflow to deliver a devastating, high-decibel blast. It’s simple physics: more air equals more output. We ditched the standard 3/8” lines in favor of massive, dedicated 1/2” airlines leading to three High-Flow VX6003 brass solenoids—one for every individual horn.
This isn't just an upgrade; it’s a shocking twist on a classic, delivering soul-shaking locomotive blasts that command immediate attention. Overwhelm the senses and dominate the streets with the absolute peak of train horn intensity at your fingertip.
TOO LOUD? TOO BAD!
Air Horns vs. Train Horns
Find Your Signature Blast
Compact Air Horn Series
Engineered for "Emergency Vehicle" authority. This series delivers a sharp, high-frequency blast designed to cut through ambient noise instantly. With 3.5" bells, these horns produce a piercing scream that commands attention in heavy traffic.
- Compact Horns: 102 / 130 / 141
- Kits: HK2 / HK3 / HK4
- Compact Horns: 101 / 102-1 / 130-1 / 141-1
- Kits: HK1 / HK2-1 / HK3-1 / HK4-1 / HKUTV / Vehicle Specific Kits: 102, 102-1
Train Horn Series
Don’t just make noise—make an impact. Engineered with massive 6-7" bells, our Train Horns move huge volumes of air to create a deep, earth-shaking rumble. This is the authentic tone of a classic 40,000-lb locomotive.
- Train Horns: 500 / 501 / 502 / 630
- Kits: HK6 / HK8
- Train Horns: 220 / 230 / 730
- Kits: HK5 / HK7 / HK9 / HK9-Slimline
Professional-grade engineering. Legendary Kleinn Performance.
Train Horn Specifications
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Triple ABS Train Horns |
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Part Number |
Model (230) “The Beast" |
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Number of horns |
3 (Flat Rack or Individual Mount) |
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Warranty |
1-Year Warranty |
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Construction |
Composite Black ABS Trumpets |
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Heavy Duty Brass Solenoid (12-Volt) |
P/N- VX6003 (51438 & 53814N Fittings Incl.) |
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Max Pressure |
150 PSI |
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Output (dB) @ 150 PSI |
155.1dB (156.9 dB w/ 6885 Upgrade Kit) |
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Dimensions (On Flat Rack Bar) |
18.5” L x 18” W x 7” H |
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Dimensions (Each Individual Horn) |
18.5” Lg. – 16.5” Med. - 14.5” Sm. |
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Minimum Tank Size Required |
2.5-Gallon |
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Airline Length and Size Included |
12’ of ¼” OD Airline |
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Upgrade kit compatibility |
Use Model 6885 |
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Air Compressor Specifications
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Ultra Heavy-Duty Air Compressor |
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Part Number |
Model (6450RC) |
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Warranty |
2-Year Extended (6450RC, 6650RC, & 730) |
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Compressor Type |
Waterproof Sealed, Oil-less |
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Motor Type |
Permanent Magnetic Motor |
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Waterproof & Submersible |
Sealed Internally (Must install “Snorkel” system) |
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Compressor “Snorkel Kit” |
Remote Air Filter Relocation Kit- 12' 3/8” Airline |
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Voltage |
12-Volt DC |
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Duty Cycle |
100% @ 100 PSI (@ 72° F) |
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Flow Rate |
@ 0 PSI (13.8 Volts): 2.5 CFM |
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Max Pressure |
200PSI |
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Max Amp Draw |
23 Amps |
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Dimensions |
11.25” L x 4” W x 6.50” H |
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Mounting Holes |
8.90” L x 3.31” W (5mm Diameter) |
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Mounting Note |
Do not mount upside down |
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Pressure Switch |
P/N 2151 (Works with 52175 Safety Valve) |
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Air Tank Specifications
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3-Gallon Slim Air Tank |
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Part Number |
Model (6351RT) |
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Warranty |
1-Year |
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Tank Capacity |
3-Gallon |
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Construction |
All Steel Design (Gloss Black Epoxy Finish) |
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Internal Coating |
Cortec Internal Anti-Corrosion Coating |
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Mounting Legs |
2 Legs w/ 4 Mounting Points |
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Air Tank Ports |
5 - 1/4" NPT Ports & 1 - 3/8" NPT Ports |
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Mounting Hardware |
Fitting Pack - 4 Bolts, Nuts, Washers |
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Max Pressure |
200 PSI |
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Dimensions |
27” L x 6” W x 8” H |
Air Tank Fill Rates
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Tank Capacity |
Tank Pressure Range |
Tank Fill Rate |
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2.5 Gallon |
0 - 150 PSI |
2 Min. 54 Sec. (+/- 10 Sec.) |
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2.5 Gallon |
110 - 150 PSI |
54 Sec. (+/- 5 Sec.) |
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5 Gallon |
0 - 150 PSI |
5 Min. 57 Sec. (+/- 10 Sec.) |
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5 Gallon |
110 - 150 PSI |
1 Min. 53 Sec. (+/- 5 Sec.) |
Installation Instruction Links:

$1,149.95