---
product_id: 607918899
title: "SA 400.4 4-Channel Digital Car Audio Amplifier, 400W RMS 2 Ohms Stable, Compact Class D Multi-Channel Amp with Crossover & MOSFET Power Supply, Full-Range Sound Quality"
brand: "soundfy"
price: "€ 150.50"
currency: EUR
in_stock: true
reviews_count: 9
category: "Soundfy"
url: https://www.desertcart.com.cy/products/607918899-sa-400-4-4-channel-digital-car-audio-amplifier-400w
store_origin: CY
region: Cyprus
---

# 2Ω stable MOSFET supply Compact 2.2x4.37x5.67 in 400W RMS power SA 400.4 4-Channel Digital Car Audio Amplifier, 400W RMS 2 Ohms Stable, Compact Class D Multi-Channel Amp with Crossover & MOSFET Power Supply, Full-Range Sound Quality

**Brand:** soundfy
**Price:** € 150.50
**Availability:** ✅ In Stock

## Summary

> 🚗 Amplify your drive with power and precision — don’t just listen, experience every beat!

## Quick Answers

- **What is this?** SA 400.4 4-Channel Digital Car Audio Amplifier, 400W RMS 2 Ohms Stable, Compact Class D Multi-Channel Amp with Crossover & MOSFET Power Supply, Full-Range Sound Quality by soundfy
- **How much does it cost?** € 150.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/607918899-sa-400-4-4-channel-digital-car-audio-amplifier-400w)

## Best For

- soundfy enthusiasts

## Why This Product

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

## Key Features

- • **Rock-Solid Reliability:** MOSFET power supply with short-circuit protection ensures long-lasting, safe performance on every drive.
- • **Versatile 2Ω Stability:** Efficiently powers both speakers and subwoofers, adapting seamlessly to diverse car audio setups.
- • **Sleek, Space-Saving Design:** Compact Class D amplifier fits effortlessly in tight car spaces without overheating or bulk.
- • **Power Your Ride Loud & Clear:** 400 Watts RMS across 4 channels delivers immersive, distortion-free sound that dominates road noise.
- • **Custom-Tailored Audio Precision:** Built-in LPF & HPF crossover controls let you sculpt crisp highs and deep lows for any music style.

## Overview

The Soundfy SA 400.4 is a compact 4-channel Class D car amplifier delivering 400W RMS at 2 ohms, designed for tight spaces and high-performance sound. Featuring precise crossover controls and a MOSFET power supply with built-in safety, it offers reliable, distortion-free audio enhancement for both speakers and subwoofers, making it an ideal upgrade for audiophiles seeking powerful, customizable in-car sound.

## Description

Buy Soundfy SA 400.4 4-Channel Digital Car Audio Amplifier, 400W RMS 2 Ohms Stable, Compact Class D Multi-Channel Amp with Crossover & MOSFET Power Supply, Full-Range Sound Quality: Equalizers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Good amp - Amazing little amp worth the money. The power is enough for what I need and I wanted something small and compact cause my car doesn’t have much room in it and I need as much room as I can. This little amp powered 6 1/2 inch sub and some door speakers. It hasn’t got hot enough to shut off or anything sounds good. I can’t complain. I wish it had a soft start because you do get a pop in the beginning.
Review: Small size makes for an easy install! - My 1997 Del Sol does not have much space. Heck there's not even enough space for a decent cupholder. But this amplifier fit easily down the center console with room to spare. I've got it connected to the four 6.5" 2way speakers. The extra power from the amp, made the speakers sound fuller with all the different types of music I listened too. I am not an audiophile. But, I am very happy with this cost-effective solution. the only issue I ran into was that the left and right connections were reversed for both the front and rear channels. I just had to reverse the RCA's and it worked fine.

## Features

- High-Powered Sound & Clear Output: Elevate your car stereo with 400 Watts RMS across four channels, giving you louder, cleaner audio to combat road noise. Whether you’re pumping bass or clarifying vocals, the Soundfy SA 400.4 ensures a more immersive ride.
- Compact & Sleek Class D Design: Designed for easy installation in tight spaces, this mini amplifier features advanced Class D technology that reduces heat and distortion—giving you powerful performance without bulky equipment.
- Reliable 2Ω Stable Operation: Experience consistent power with a 2-ohm stable setup. Perfect for running both speakers and subwoofers, it efficiently handles varied car or motorcycle audio configurations without sacrificing sound quality.
- Precise Crossover Controls: Tweak your system’s output for optimal clarity. Built-in LPF & HPF settings let you customize full-range audio or isolate specific frequencies, ensuring crisp highs and punchy lows in every genre of music.
- Durable Build & Safety Features: Equipped with MOSFET power supply and built-in short-circuit protection, the SA 400.4 amps up reliability for long-term use. Enjoy the confidence of a robust, heat-managing amplifier that keeps your setup safe and your music sounding great.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CSDV4MM3 |
| Best Sellers Rank | #95,953 in Electronics ( See Top 100 in Electronics ) #311 in Car Multichannel Amplifiers |
| Brand | Soundfy |
| Date First Available | January 15, 2024 |
| Item Weight | 1.08 pounds |
| Item dimensions L x W x H | 2.2 x 4.37 x 5.67 inches |
| Item model number | SA 400.4 |
| Manufacturer | Soundfy |
| Maximum Supply Voltage | 12 Volts (DC) |
| Minimum Supply Voltage | 12 Volts (DC) |
| Mounting Type | Surface Mount |
| Number of Channels | 4 |
| Output Power | 400 Watts |
| Package Type Name | Box |
| Product Dimensions | 2.2 x 4.37 x 5.67 inches |

## Product Details

- **Item dimensions L x W x H:** 2.2 x 4.37 x 5.67 inches
- **Manufacturer:** Soundfy
- **Maximum Supply Voltage:** 12 Volts (DC)
- **Minimum Supply Voltage:** 12 Volts (DC)
- **Mounting Type:** Surface Mount

## Images

![SA 400.4 4-Channel Digital Car Audio Amplifier, 400W RMS 2 Ohms Stable, Compact Class D Multi-Channel Amp with Crossover & MOSFET Power Supply, Full-Range Sound Quality - Image 1](https://m.media-amazon.com/images/I/71zO8HTRuCL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good amp
*by W***S on October 6, 2025*

Amazing little amp worth the money. The power is enough for what I need and I wanted something small and compact cause my car doesn’t have much room in it and I need as much room as I can. This little amp powered 6 1/2 inch sub and some door speakers. It hasn’t got hot enough to shut off or anything sounds good. I can’t complain. I wish it had a soft start because you do get a pop in the beginning.

### ⭐⭐⭐⭐⭐ Small size makes for an easy install!
*by J***O on April 23, 2024*

My 1997 Del Sol does not have much space. Heck there's not even enough space for a decent cupholder. But this amplifier fit easily down the center console with room to spare. I've got it connected to the four 6.5" 2way speakers. The extra power from the amp, made the speakers sound fuller with all the different types of music I listened too. I am not an audiophile. But, I am very happy with this cost-effective solution. the only issue I ran into was that the left and right connections were reversed for both the front and rear channels. I just had to reverse the RCA's and it worked fine.

### ⭐⭐⭐⭐ Price to performance it's a good amp
*by R***T on September 4, 2025*

Purchased for our boat, currently only have two 6.5" speakers hooked up to it and it gets plenty loud even swimming it's still very audible. Installation was easy, however, I did have one complaint and that was the correct way to wire the speakers. The instructions say +,-,+,- except you only have 3 terminals. I found that hooking it up like this (essentially in series) did not produce even sound out of the speakers. I ended up using the middle terminal for negative and positives on the left and right. I also chose to use 10 gauge for the power run since it's about 20' from the battery to the amp. A heads up to anyone using 8 gauge - DO NOT tighten the set screw down too much, mine stripped out on the negative. I'd recommend sticking with 10 gauge for the power run if possible. I set the amp using a DD-1, It had pretty clean output at nearly full gain before clipping with my Boss head unit. After a full day of boating the amp was pretty hot, keep this in mind for anyone mounting around plastic or an ignition source.

## Frequently Bought Together

- Soundfy SA 400.4 4-Channel Digital Car Audio Amplifier, 400W RMS 2 Ohms Stable, Compact Class D Multi-Channel Amp with Crossover & MOSFET Power Supply, Full-Range Sound Quality
- DteeDck RCA Splitter 1 Female to 2 Male, 2 Pack - RCA Audio Video Cable Splitter Adapter, Dark Blue
- BOSS Audio Systems KIT2 8 Gauge Complete Car Amplifier Installation Wiring Kit with Power Cables, Ground Cables, Turn-On Wire, Speaker Wire, Terminals

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-03-17*