Independent · Tested · No fluff
The research desk for train horns.
Reviews, install guides, state-by-state legality, and calculators you won't find anywhere else. For anyone spending $500+ on a horn who wants the facts before they buy.
- Reference dB
- @ 10 ft
- States covered
- 50
- Calculators
- 11
- Paid placements
- 0
Sections
Where do you want to start?
Seven research pillars. Each one is a standalone rabbit-hole built from primary sources.
Reviews
Hands-on tests of horns, compressors, and kits. Real dB readings at a calibrated 10 ft reference.
Install Guides
Step-by-step, per specific vehicle. No generic "find a flat surface" advice.
By Battery Platform
Portable horns built on M18, DeWalt 20V, Ryobi. Runtime data included.
Legal by State
All 50 states. Vehicle codes, decibel limits, and citations. Not paraphrased.
Best-Of Lists
Top picks by use case. Methodology shown, not affiliate-juiced top-10s.
Tools & Calculators
Decibel distance, air tank runtime, wire gauge, more. Embed any on your site.
Technical Guides
PSI, dBA, compressor recovery, wiring. The physics, without the handwaving.
Flagship tool
How loud actually is a 150 dB horn at 500 feet?
Most horn product pages give you a single dB number at point-blank range. That's not how sound works. The Decibel Distance Calculator uses the inverse-square law to show the real number a pedestrian hears at any distance — with comparisons to chainsaws, jackhammers, and jet takeoffs.
- → dB slider from 90 to 160
- → Distance from 10 ft to 1,000 ft
- → Visual concentric-circle diagram
- → One-click embed for your site or forum post
- Source
- 150 dB @ 10 ft
- At 100 ft (1 block)
- 130 dB
- = jackhammer at arm's length
- At 500 ft (~1.5 blocks)
- 116 dB
- = chainsaw, or rock concert front row
- At 1,000 ft (~3 blocks)
- 110 dB
- = still permanent-damage threshold
Why this site
We don't sell horns. We test them.
Every product review goes through the same methodology: documented spec audit, calibrated dB meter at 10 ft (A-weighted, slow response), install on a reference vehicle, and a plain-English verdict. If a horn doesn't live up to its sticker, we say so.
How we test
- 01 Spec audit. Cross-check manufacturer claims against third-party sources.
- 02 Bench dB test. Extech SDL600, 10 ft, open field, A-weighted slow.
- 03 Reference install. Document fitment, tools, time, gotchas.
- 04 Verdict. Who it's for, who it's not for, and what we'd buy instead.
Latest
Fresh from the bench
Get in touch
Have data we should add?
Notice a stale statute, broken install, or a horn we haven't tested? Send it over. Corrections with a cited source go live within 48 hours.
Email the desk