---
product_id: 402434120
title: "HO-9 Horn, 330 Hz + 400 Hz, Superior/Bass Horn, Super Deep Bass, 112 DB, Pack of 2, Swirl Type, Compatible with Vehicle Inspections, Ground Harness Included"
brand: "piaa"
price: "$111.89"
currency: USD
in_stock: true
reviews_count: 6
category: "Piaa"
url: https://www.desertcart.us/products/402434120-ho-9-horn-330-hz-400-hz-superior-bass-horn
store_origin: US
region: United States of America
---

# Dual-tone 330 Hz + 400 Hz bass 112 dB ultra-loud output Universal 12V vehicle compatibility HO-9 Horn, 330 Hz + 400 Hz, Superior/Bass Horn, Super Deep Bass, 112 DB, Pack of 2, Swirl Type, Compatible with Vehicle Inspections, Ground Harness Included

**Brand:** piaa
**Price:** $111.89
**Availability:** ✅ In Stock

## Summary

> 🎺 Own the road with bass that speaks louder than words!

## Quick Answers

- **What is this?** HO-9 Horn, 330 Hz + 400 Hz, Superior/Bass Horn, Super Deep Bass, 112 DB, Pack of 2, Swirl Type, Compatible with Vehicle Inspections, Ground Harness Included by piaa
- **How much does it cost?** $111.89 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/402434120-ho-9-horn-330-hz-400-hz-superior-bass-horn)

## Best For

- piaa enthusiasts

## Why This Product

- Trusted piaa brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Universal Fit:** Seamlessly compatible with all 12V passenger vehicles—no hassle, just install.
- • **Complete Kit with Ground Harness:** Everything you need for a professional-grade install included.
- • **Dual-Tone Bass for Signature Sound:** Experience a rich, deep 330 Hz + 400 Hz swirl tone that sets your ride apart.
- • **Command Attention with 112 dB Power:** Cut through city noise with a horn that demands to be heard.
- • **Sleek Swirl Design in Durable Black:** Modern aesthetics meet rugged plastic build for lasting style and performance.

## Overview

The HO-9 Horn delivers a powerful 112 dB dual-tone sound at 330 Hz and 400 Hz frequencies, engineered for 12V vehicles. This pack of two super bass swirl-type horns includes a ground harness for easy installation, combining superior sound depth with universal fit and durable black plastic construction. Perfect for professionals seeking a commanding, distinctive horn that elevates vehicle presence.

## Description

PIAA Sports Horn (Super Bas) Heavy Bass 330/400Hz The highest level of deep bass for sound depth. Enjoy the deepest tone of the horn series. Product Number: HO-9 Specifications: 12 V/2 terminals / 112 dB Contents: Horns: 2 pieces (earth wire included). Weight: 6.3 oz (180 g) (per piece)

Review: Excellent Quality - The sound is very good and it’s an excellent quality.
Review: Pésimo claxon - Un producto que no cumple con sus expectativas en lo más mínimo, después de atravesar un charco ya casi no se escucha parece que le entra agua suena como trompeta con voz aguardientosa. No lo recomiendo

## Features

- Specifications: For 12 V vehicles, 112 dB (330 Hz + 400 Hz), 2 terminal specifications
- Package Size: 7.1 x 3.9 x 9.1 inches (180.0 x 100.0 x 230.0 mm)
- Country of Origin: Japan
- Package weight: 0.53 kg

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004VJMYD2 |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #14,322 in Automotive ( See Top 100 in Automotive ) #10 in Musical Horns |
| Brand | Piaa |
| Brand Name | Piaa |
| Color | Black |
| Colour | Black |
| Compatible with Vehicle Type | Passenger Car |
| Customer Reviews | 4.4 out of 5 stars 862 Reviews |
| Fit Type | Universal Fit |
| Fit type | Universal Fit |
| Included Components | Earth Harness |
| Item Type Name | car horn |
| Manufacturer | PIAA(ピア) |
| Manufacturer Part Number | HO-9 |
| Material | Plastic |
| Material Type | Plastic |
| Model Number | HO-9 |
| Noise Level | 112 Decibels |
| OEM Equivalent Part Number | HO-9 |
| Style | Super Bass / Swirl |
| Style Name | Super Bass / Swirl |
| Voltage | 12 Volts |

## Product Details

- **Brand:** Piaa
- **Colour:** Black
- **Material:** Plastic
- **Voltage:** 12 Volts
- **Fit type:** Universal Fit

## Images

![HO-9 Horn, 330 Hz + 400 Hz, Superior/Bass Horn, Super Deep Bass, 112 DB, Pack of 2, Swirl Type, Compatible with Vehicle Inspections, Ground Harness Included - Image 1](https://m.media-amazon.com/images/I/71lW-dy7e7L.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Questions & Answers

**Q: Is this the same as piaa 85115, and if so why the different part number ho-9?**
A: This is Japanese version.
All instruction in Japanese.

**Q: What does piaa [peer] mean.  peer suggests equal. is this a copy of the pia product?**
A: PIAA is the name of a Japanese company specializing in automotive equipment. They make a variety of automative accessories including car horns: https://www.piaa.co.jp/category/english/e_4rin/e_horn/#400-500hz-sports-horn
Don't know of any relationship to PIA as you stated in your question. I installed the horns on my Polaris Slingshot replacing the single horn that came with the vehicle. The sound is much louder and richer than the original one due to the dual horns set at different frequencies of 400Hz and 500Hz. Well-satisfied with the results. Hope this helps.

**Q: do it come with the adapter wire ?**
A: They come with wires and connectors. I am not sure what you mean by adapters. You simply plug the existing wire from your auto onto one horn and use the accompanying wires to connect the second horn to the first. Then ground the second horn to complete the circuit. It is all very simple and easy.

**Q: will this work on motorcycle?**
A: No, this don't work on motorcycle.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent Quality
*by H***R on 4 November 2023*

The sound is very good and it’s an excellent quality.

### ⭐ Pésimo claxon
*by P***O on 17 February 2025*

Un producto que no cumple con sus expectativas en lo más mínimo, después de atravesar un charco ya casi no se escucha parece que le entra agua suena como trompeta con voz aguardientosa. No lo recomiendo

### ⭐⭐⭐⭐⭐ 9 months on my kei truck and traffic actually hears me
*by H***N on 27 April 2026*

Imported kei trucks ship without most of the safety equipment we take for granted, and the factory horn is part of that gap. It's cute and works fine in a Japanese parking lot, but on American roads where my knees are the crumple zone, I want a distracted SUV driver to actually hear me. Nine months in, including a full winter of wet and snowy weather (these mount low and exposed, so that matters), zero issues. The dual tone makes my truck sound like something twice its size, loud enough to cut through traffic noise without being shrill. Install on my Subaru Sambar was easier than expected because of the available space back there. Still required splicing into the existing horn wires rather than plug-and-play, and the hardest part was finding solid mounting points that wouldn't vibrate loose. Took a family vote on whether to keep the original, run the original alongside these, or replace it entirely. They nearly all voted to keep the cute 'meep' horn. But I overruled and installed these. I might wire the meep up to a separate button anyway, just for the smile.

## Frequently Bought Together

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-12*