Roots Megasonic Dual Tone Horn 12V (High + Low) – 120±5 dB Grill Horn Upgrade for Cars, SUVs & Select Bikes – IS 1884:1993

Want a horn that cuts through highway traffic with a proper “impact tone”? Roots Megasonic is a premium dual-tone (High + Low) grill horn built for harsh Indian conditions, with published Roots specs and IS compliance. Packed and shipped by Under The Hood with fitment support

The biggest reason people upgrade horns is simple: stock horns become dull, and in real traffic (buses, autos, highway overtakes) you need a clear, commanding note—not just noise. Roots Megasonic is designed as a die-cast grill horn with “impact tone and acoustic characteristics” and strong environmental resistance, making it a dependable option for daily city + highway use.

Unlike random marketplace horns with no real engineering data, Roots publishes the Megasonic’s key parameters: 12V/24V family, current consumption, frequency for high and low tones, and sound-pressure 120 ± 5 dB(A) with IS 1884:1993 compliance references. This makes it easier to choose the right wiring method and reduces trial-and-error.

Fitment note (important): Megasonic is typically used on cars/SUVs, and many riders also mount it on select motorcycles for highway presence. For bikes, treat it as a retrofit—verify space, bracket mounting and wiring capacity. For best reliability on any vehicle, a relay + correct fuse is recommended (especially when upgrading from small OEM horns).

Key Features & Benefits

• Genuine Roots Megasonic family horn (premium grill horn design)

• Dual Tone (High + Low) for more noticeable road presence vs single tone

• Sound-pressure: 120 ± 5 dB(A) (published by Roots)

• High tone 395 Hz + Low tone 315 Hz (published by Roots)

• Highly resistant to adverse environmental conditions (Roots positioning)

• IS 1884:1993 compliance reference (Roots spec listing)

• Ideal for highway overtakes + dense city traffic where weak horns fail

• Works best with relay wiring for stable output and switch protection

• Under The Hood packing + fitment support to reduce wrong orders

Technical Specifications 

Important correction: Your current UTH page mentions 110 dB; Roots’ published spec is 120 ± 5 dB(A).

Compatibility 

a) Confirmed Compatible Models (based on Roots official application)

b) ❓ Likely / Popular Retrofits (Check Before Ordering)

These are widely discussed/used, but should be treated as retrofit fitment:

• Motorcycles (12V) where riders want a strong highway horn note (verify bracket space + wiring/relay).

• If installing on Royal Enfield / other bikes: check mounting clearance and ensure electrician uses relay + fuse.

c) Not Compatible / Common Confusion

• “Direct plug-and-play on every bike” — not guaranteed. Treat bike installs as retrofit.

What’s in the Box 

Your page currently lists:

• 2 × Roots Megasonic Horns (High & Low Tone)

Installation & Maintenance Notes 

• Install via experienced mechanic/electrician (high-current device).

• Use a relay + correct fuse for best reliability and to protect switchgear.

• Mount horns facing slightly downward/sideways to reduce water pooling.

• Recheck mounting bolts after 3–7 days of use.

FAQ

Q1) How loud is Roots Megasonic actually?
Roots publishes 120 ± 5 dB(A) for Megasonic. Some sellers quote different numbers; rely on Roots spec for accuracy.

Q2) Is it waterproof?
Roots positions Megasonic as highly resistant to adverse environmental conditions. Correct mounting direction still matters.

Q3) Will it fit my Royal Enfield / bike?
Many riders retrofit it on bikes, but it’s not guaranteed bolt-on for every model. Verify mounting space + bracket + wiring/relay before ordering.

Q4) Do I need a relay?
Recommended—especially when upgrading from small OEM horns. Relay wiring helps stability and protects the switchgear.

Q5) Is it road legal?
It references IS 1884:1993 compliance on Roots’ spec sheet. Final on-road enforcement can vary by state/local rules.

Q6) 12V vs 24V — what should I buy?
Most bikes and passenger cars are 12V. Many heavy commercial vehicles are 24V. Confirm your battery system first.

Q7) Why choose Megasonic over cheaper horns?
You’re paying for a proven horn family with published electrical/acoustic specs and better long-term reliability than unknown-brand copies.