---
product_id: 223932020
title: "SK-M4004D Compact Full-Range RMS Mosfet 4 Channel Car Amplifier, Class D, 400W"
brand: "skar audio"
price: "3067 zł"
currency: PLN
in_stock: true
reviews_count: 5
category: "Skar Audio"
url: https://www.desertcart.pl/products/223932020-sk-m4004d-compact-full-range-rms-mosfet-4-channel-car
store_origin: PL
region: Poland
---

# 400W max power output Ultra-compact 7.9in x 4.6in x 1.7in Adjustable HPF/LPF/Full-range crossover SK-M4004D Compact Full-Range RMS Mosfet 4 Channel Car Amplifier, Class D, 400W

**Brand:** skar audio
**Price:** 3067 zł
**Availability:** ✅ In Stock

## Summary

> 🎵 Compact Power, Big Impact – Amplify Your Drive!

## Quick Answers

- **What is this?** SK-M4004D Compact Full-Range RMS Mosfet 4 Channel Car Amplifier, Class D, 400W by skar audio
- **How much does it cost?** 3067 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/223932020-sk-m4004d-compact-full-range-rms-mosfet-4-channel-car)

## Best For

- skar audio enthusiasts

## Why This Product

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

## Key Features

- • **Space-Savvy Design:** Ultra-compact footprint fits seamlessly in tight spaces without compromising power or performance.
- • **Tailored Sound Control:** User-friendly crossover controls (HPF, LPF, Full-Range) let you customize your audio experience like a pro.
- • **Built to Last & Protect:** 4-way protection circuitry guards against thermal, voltage, speaker, and DC faults for reliable, worry-free driving.
- • **Plug & Play Versatility:** High-level inputs and adapter harness simplify installation—no RCA? No problem.
- • **Powerhouse in a Mini Package:** Delivers 140W RMS x4 channels at 2Ω for crystal-clear, distortion-free sound that wakes up your ride.

## Overview

The Skar Audio SK-M4004D is a compact, Class D MOSFET 4-channel car amplifier delivering up to 400W total power. Engineered for tight spaces, it offers 140W RMS per channel at 2 ohms with adjustable crossover controls and high-level inputs for versatile installation. Built-in 4-way protection ensures durability and consistent performance, making it the perfect upgrade for millennial drivers seeking powerful, clean sound without bulk.

## Description

The Skar Audio SK-M4004D is an ultra compact, "mini", Class D full-range, four channel car speaker amplifier. The SK-M4004D was engineered to be compact, but provide the power and reliability expected out of larger amplifiers. Featuring a high speed MOSFET power supply, and an efficient Class D design, this amplifier is powerful, reliable, and extremely versatile. The SK-M4004D makes for a great amplifier in applications where space is limited but power cannot be sacrificed. In addition, this four channel amplifier features high level input connections for those installations that lack an RCA connection. In addition to the high level inputs, this amplifier also utilizes an adapter harness for the speaker outputs allowing for an easier and cleaner installation. Further adding to the feature rich list of this amplifier are its high pass / full-range / and low pass user controls, as well as having 4-Way Protection Circuitry Built-in (Thermal, Voltage, Speaker, DC). Utilizes 8 Gauge Power and Ground Input Terminals. Amplifier's dimensions: 7.9in x 4.6in x 1.7in (L x W x H). Frequency Response: 10Hz - 40kHz.

Review: This Skar Audio SK-M4004D amp is a beast in a small package — delivers crisp, distortion-free sound and plenty of power for all four channels. It runs cool, fits anywhere, and really wakes up your speakers. Perfect mix of size, strength, and quality. 💪
Review: The amplifier is in itself built well and performs as you can expect a budget friendly amp will. As per sound quality I installed this on my truck and it is quite comparable to the 600$ old kenwood that came out of it. It however does have some things to note that are important at this price point, the warranty is voided as soon as you install this thing, the internal components however good are still basic in nature, the installation process is slightly tedious with the output side clip but is expected, and the amp does get quite warm. Because the amp is basic in nature it lacks (at least in my experience) a line filter so that power from your alternator does not affect sound quality. You can simply buy a noise suppressor for the power feed to solve this issue. I did experience the fan never turning off and this was a problem as it does make an audible noise while on. I after already installing the unit and figuring this out, decided to break down the amp and disconnect the fan altogether. There is a simple clip you undo that is delicate but doable. THIS WILL VOID A WARRANTY. But it did solve my problem and after dynoing my 4 door speakers at full throttle for 20 minutes my amp did not get hot just the warmer side of things. After all the little fan didn't do much. I only did this because my amp is mounted by floating brackets under my passenger seat; if this was in a glove box or the trunk of a car there would be no problem. Other than the the sound quality is clean and powerful, the unit is built well and on the good side of heavy (not feeling cheap), and I can expect it to last. Update* the amplifier died after a few months of running it hard. However if you run it well within its ratings I believe it should hold up well

## Features

- Ultra Compact MOSFET Full-Range 4-Channel Class D Car Amplifier
- RMS Power @ 2 Ohms: 140 Watts x 4 Channels (14.4v)
- RMS Power @ 4 Ohms: 100 Watts x 4 Channels (14.4v)
- Crossover Controls: HPF / Full-Range / LPF | Frequency Response: 10Hz - 40kHz
- Hi-Level Input Connections: Yes | 8 Gauge Power and Ground Input Terminals

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01EQX5ORK |
| Are batteries included? | No |
| Brand | Skar Audio |
| Compatible Device | Amplifiers |
| Connectivity Technology | RCA |
| Country of Origin | USA |
| Customer Reviews | 4.2 4.2 out of 5 stars (435) |
| Date First Available | 17 June 2016 |
| Generic Name | Car Amplifier |
| Global Trade Identification Number | 00739189979165 |
| Included Components | Skar Audio SK-M4004D Compact Full-Range Class D 4 Channel Amplifier |
| Item Dimensions LxWxH | 20.1 x 11.8 x 4.2 Centimeters |
| Item Height | 1.65 Inches |
| Item Weight | 1 kg 700 g |
| Item Width | 4.64 Inches |
| Item dimensions L x W x H | 20.1 x 11.8 x 4.2 Centimeters |
| Item model number | SK-M4004D |
| Manufacturer | Skar Audio |
| Maximum Supply Voltage | 14.4 Volts |
| Minimum Supply Voltage | 14.4 Volts |
| Model number | SK-M4004D |
| Mounting Type | Surface Mount |
| Net Quantity | 1.0 Count |
| Number of Channels | 4 |
| Number of Memory Sticks | 1 |
| Output Power | 134 Watts |
| Output Wattage | 400 Watts |
| Power Source | corded electric |
| Product Dimensions | 20.07 x 11.79 x 4.19 cm; 1.7 kg |
| Specification Met | CE |
| UPC | 739189979165 |
| Voltage | 14.4 Volts |

## Product Details

- **Item dimensions L x W x H:** 20.1 x 11.8 x 4.2 Centimeters
- **Manufacturer:** Skar Audio
- **Maximum Supply Voltage:** 14.4 Volts
- **Minimum Supply Voltage:** 14.4 Volts
- **Voltage:** 14.4 Volts

## Images

![SK-M4004D Compact Full-Range RMS Mosfet 4 Channel Car Amplifier, Class D, 400W - Image 1](https://m.media-amazon.com/images/I/61npvuKc0ML.jpg)

## Available Options

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

## Questions & Answers

**Q: Can u run 8  speakers on this?**
A: Yes you can. Two speakers per channel in parallel but make sure that the impedence of each speaker is 4 ohms or more because the minimum impedence that this amp can work in a stable condition is 2 ohms. Also keep in mind that each speaker will get around 100-115 watts.

**Q: Can I use this amp to run my subs and tweets since it a four channel amp**
A: I wouldn't recommend it

**Q: I have ix 8 d2 sub, what amp should I get for it?**
A: You can run a Skar RP 350.1

**Q: Can i hook up tweeters, two front 90w rms and two 45w rms speakers to this?**
A: I have tweeters on mine with 2 6.5s running in HPF.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by D***K on 14 October 2025*

This Skar Audio SK-M4004D amp is a beast in a small package — delivers crisp, distortion-free sound and plenty of power for all four channels. It runs cool, fits anywhere, and really wakes up your speakers. Perfect mix of size, strength, and quality. 💪

### ⭐⭐⭐⭐ Review
*by J***R on 22 May 2022*

The amplifier is in itself built well and performs as you can expect a budget friendly amp will. As per sound quality I installed this on my truck and it is quite comparable to the 600$ old kenwood that came out of it. It however does have some things to note that are important at this price point, the warranty is voided as soon as you install this thing, the internal components however good are still basic in nature, the installation process is slightly tedious with the output side clip but is expected, and the amp does get quite warm. Because the amp is basic in nature it lacks (at least in my experience) a line filter so that power from your alternator does not affect sound quality. You can simply buy a noise suppressor for the power feed to solve this issue. I did experience the fan never turning off and this was a problem as it does make an audible noise while on. I after already installing the unit and figuring this out, decided to break down the amp and disconnect the fan altogether. There is a simple clip you undo that is delicate but doable. THIS WILL VOID A WARRANTY. But it did solve my problem and after dynoing my 4 door speakers at full throttle for 20 minutes my amp did not get hot just the warmer side of things. After all the little fan didn't do much. I only did this because my amp is mounted by floating brackets under my passenger seat; if this was in a glove box or the trunk of a car there would be no problem. Other than the the sound quality is clean and powerful, the unit is built well and on the good side of heavy (not feeling cheap), and I can expect it to last. Update* the amplifier died after a few months of running it hard. However if you run it well within its ratings I believe it should hold up well

### ⭐⭐⭐ Review
*by C***. on 9 August 2025*

Sounds quality good power and ground screws sets backoff causing powerless only thing haven't tried is lock locktite in theads to prevent blackout of set screw

## Frequently Bought Together

- Skar Audio SK-M4004D Compact Full-Range Class D 4 Channel Car Amplifier, 400W
- Skar Audio 4 Gauge OFC Complete Amplifier Installation Wiring Kit, SKAR4ANL-OFC
- Skar Audio RP-1200.1D Monoblock Class D MOSFET Amplifier with Remote Subwoofer Level Control, 1200W

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-03-20*