---
product_id: 33785927
title: "Infinity REF-551A Reference Mono, 550w X 1 Amplifier"
brand: "infinity"
price: "₩458360"
currency: KRW
in_stock: false
reviews_count: 9
url: https://www.desertcart.kr/products/33785927-infinity-ref-551a-reference-mono-550w-x-1-amplifier
store_origin: KR
region: South Korea
---

# 550W RMS Power Output Compact Slim Chassis Variable Crossovers & Bass Boost Infinity REF-551A Reference Mono, 550w X 1 Amplifier

**Brand:** infinity
**Price:** ₩458360
**Availability:** ❌ Out of Stock

## Summary

> 🎵 Power Meets Precision — Amplify Your Drive with Infinity REF-551A

## Quick Answers

- **What is this?** Infinity REF-551A Reference Mono, 550w X 1 Amplifier by infinity
- **How much does it cost?** ₩458360 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/33785927-infinity-ref-551a-reference-mono-550w-x-1-amplifier)

## Best For

- infinity enthusiasts

## Why This Product

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

## Key Features

- • **Underrated Powerhouse:** Delivers more power than rated, outperforming expectations at an unbeatable price.
- • **Precision Sound Tuning:** Variable electronic crossovers and bass boost let you tailor your audio experience.
- • **Pure Power, Slim Profile:** Delivers 550W RMS in a compact chassis that fits tight spaces effortlessly.
- • **Next-Gen Vehicle Tech Ready:** Works with ADAS alerts and Harman HALOsonic for immersive, noise-cancelling soundscapes.
- • **Seamless System Integration:** High- and low-level inputs ensure compatibility with virtually any car stereo system.

## Overview

The Infinity REF-551A is a 550W RMS monoblock amplifier designed for professional-grade car audio. Its compact design fits most vehicles, while variable crossovers and bass boost provide precise tuning. Compatible with advanced vehicle systems like ADAS and Harman HALOsonic, it enhances both sound quality and driving experience. Known for delivering power beyond its rating, this amplifier offers exceptional value and performance for audiophiles seeking a sleek, powerful upgrade.

## Description

New Infinity Reference amplifiers deliver pure power from a slim, compact chassis that’s designed to fit in more vehicles. Reference amps incorporate our latest amplifier topology, include variable electronic crossovers and bass boost control for precise system tuning, and feature high- and low-level inputs for easy interface with virtually any system. They’re also compatible with several new vehicle technologies, including many advanced driver assistance systems, and Harman HALOsonic, a suite of acoustic solutions that can simulate engine sounds for a better driving experience in hybrids and electric cars, cancel road noise for better-sounding music, and more. In The Box: 1 amplifier High-level input wiring harness 2 spare fuses 2 2-color brand stickers Quick start guide Signal-to-Noise Ratio >80dB (ref 1W output @ 4Ω) Max Power - 1300W Peak System Specifications Power Output, 2Ω - 550W RMS x 1, <1.0% THD+N Power Output, 4Ω - 370W RMS x 1, <1.0% THD+N Infinity Reference amplifiers are designed with a compact chassis and small footprint to ease installation, even if available space is limited. Speaker-level and low-level inputs allow Reference amps to work with just about any car stereo, aftermarket or factory. Unlike many amplifiers available at similar prices, Reference amps feature variable electronic crossovers and bass boost circuit to allow for fine-tuning.In vehicles with ADAS warning systems, you can assign a channel to broadcast system alert messages. Reference amps can also work with the HALOsonic systems of select vehicles, which helps reduce external noise for a better sonic experience.

Review: Probably the best budget amplifier on the market - Excellent amplifier. This and the JBL club 5501 both use the same Harman kardon amplifier circuitry. I'm sure there's another much higher end model that uses the same circuit board, because both amplifiers have features that are not listed anywhere in their literature and which both JBL and infinity will deny they have. Most notably the reference 551 a and the club 5501 are capable of sensing an audio signal to turn on and off instead of using a dedicated remote line. they are also capable of putting out quite a bit more power than their rated for which is pretty rare. At $140 I don't think you can buy a better amplifier. Certainly not new.
Review: Great little amp - This amp is a great overall sub amp. The power is underrated and the sound quality is top notch. Power is probably closer to 800 watts. Pairs perfectly with 2 10” Infinity Kappa subs. I will continue to recommend Infinity Reference series amps.

## Features

- Infinity REF-551A Amplifier 1300W Peak (550W RMS) Reference Series Monoblock Amplifier

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01KX8PT1I |
| Best Sellers Rank | #211,638 in Electronics ( See Top 100 in Electronics ) #490 in Car Multichannel Amplifiers |
| Brand | Infinity |
| Customer Reviews | 4.2 4.2 out of 5 stars (54) |
| Date First Available | August 24, 2016 |
| Global Trade Identification Number | 00050667370916, 05066737091600 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 7.28 pounds |
| Item dimensions L x W x H | 11.5 x 9.25 x 4.25 inches |
| Item model number | REF-551A-KL |
| Manufacturer | Infinity |
| Material | Metal |
| Mounting Type | Surface Mount |
| Number of Channels | 1 |
| Output Power | 550 Watts |
| Package Type Name | Box |
| Product Dimensions | 11.5 x 9.25 x 4.25 inches |
| Specification Met | True |
| UPC | 050667370916 |
| Warranty | 1-Year Manufacturer Warranty |

## Product Details

- **Brand:** Infinity
- **Item dimensions L x W x H:** 11.5 x 9.25 x 4.25 inches
- **Manufacturer:** Infinity
- **Mounting Type:** Surface Mount
- **Number of Channels:** 1

## Images

![Infinity REF-551A Reference Mono, 550w X 1 Amplifier - Image 1](https://m.media-amazon.com/images/I/71eqUaVk5YL.jpg)
![Infinity REF-551A Reference Mono, 550w X 1 Amplifier - Image 2](https://m.media-amazon.com/images/I/71XFz5ssCeL.jpg)
![Infinity REF-551A Reference Mono, 550w X 1 Amplifier - Image 3](https://m.media-amazon.com/images/I/61v8On2o35L.jpg)
![Infinity REF-551A Reference Mono, 550w X 1 Amplifier - Image 4](https://m.media-amazon.com/images/I/61Jvdpi+nBL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Probably the best budget amplifier on the market
*by E***Y on May 30, 2019*

Excellent amplifier. This and the JBL club 5501 both use the same Harman kardon amplifier circuitry. I'm sure there's another much higher end model that uses the same circuit board, because both amplifiers have features that are not listed anywhere in their literature and which both JBL and infinity will deny they have. Most notably the reference 551 a and the club 5501 are capable of sensing an audio signal to turn on and off instead of using a dedicated remote line. they are also capable of putting out quite a bit more power than their rated for which is pretty rare. At $140 I don't think you can buy a better amplifier. Certainly not new.

### ⭐⭐⭐⭐⭐ Great little amp
*by C***N on January 9, 2023*

This amp is a great overall sub amp. The power is underrated and the sound quality is top notch. Power is probably closer to 800 watts. Pairs perfectly with 2 10” Infinity Kappa subs. I will continue to recommend Infinity Reference series amps.

### ⭐ It didn't work
*by C***L on October 29, 2025*

It didn't work, powered up but no output

## Frequently Bought Together

- Infinity REF-551A Reference Mono, 550w X 1 Amplifier
- Skar Audio 4 Gauge Amplifier Wiring Kit - Blue, Copper Clad Aluminum, SKAR4ANL-CCA
- Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-04*