---
product_id: 354224069
title: "CT-400.1D Compact Class D Car Audio Monoblock Amplifier, 400 Watts RMS"
brand: "ct sounds"
price: "£153.66"
currency: GBP
in_stock: true
reviews_count: 5
category: "Ct Sounds"
url: https://www.desertcart.co.uk/products/354224069-ct-400-1d-compact-class-d-car-audio-monoblock-amplifier
store_origin: GB
region: United Kingdom
---

# 400W RMS @ 1Ω - Powerhouse punch Proprietary heat dissipation - Runs cool 4-way protection circuitry - Total safety CT-400.1D Compact Class D Car Audio Monoblock Amplifier, 400 Watts RMS

**Brand:** ct sounds
**Price:** £153.66
**Availability:** ✅ In Stock

## Summary

> 🔊 Compact power that commands attention — don’t just hear it, feel it!

## Quick Answers

- **What is this?** CT-400.1D Compact Class D Car Audio Monoblock Amplifier, 400 Watts RMS by ct sounds
- **How much does it cost?** £153.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/354224069-ct-400-1d-compact-class-d-car-audio-monoblock-amplifier)

## Best For

- ct sounds enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** 4-way protection guards against voltage spikes, overheating, and overcurrent for worry-free rides.
- • **Compact Powerhouse:** 400 watts RMS at 1-ohm load delivers earth-shaking bass without hogging space.
- • **Cool Under Pressure:** Advanced MOSFET power supply and heat dissipation keep your amp chill during marathon sessions.
- • **Seamless Installation:** Small footprint and surface mount design fit effortlessly in any vehicle, no compromises.
- • **Tailored Bass Control:** Integrated Low Pass, Subsonic filters, and Bass Boost let you sculpt your perfect sound signature.

## Overview

The CT Sounds CT-400.1D is a compact Class D monoblock amplifier delivering up to 400 watts RMS at 1-ohm load, engineered for high efficiency and cool operation. Featuring advanced MOSFET power supply, customizable bass controls, and comprehensive 4-way protection circuitry, it’s designed to fit tight spaces while powering subwoofers with clean, punchy bass. Ideal for professionals and enthusiasts seeking powerful sound without bulk.

## Description

CT Sounds engineered the CT-400.1D Compact Class D Monoblock Car Amplifier for anyone in need of a powerhouse amplifier that fits just about anywhere in your vehicle and won’t destroy your wallet. If you want a 400-watt amplifier that absolutely pounds and delivers clean power to your subwoofers then look no further. This 1-ohm stable monoblock amplifier features a Low Pass Filter (LPF), Subsonic Filter, and Bass Boost so you can get the exact sound you are looking for out of your amplifier. The MOSFET power supply and proprietary heat dissipation design will ensure that the amplifier runs cool for even the most demanding playlists. Furthermore, the compact chassis and small footprint makes it easy to install in any car audio application. You can sleep easy at night knowing your subwoofer amplifier is protected from damage due to the amplifier's uniquely engineered protection circuitry featuring high voltage, low voltage, over current, and high-temperature protection. Quick Facts: RMS Power: 1Ω @ 14.4v 400 Watts x 1-Channel RMS Power: 2Ω @ 14.4v 300 Watts x 1-Channel RMS Power: 4Ω @ 14.4v 150 Watts x 1-Channel Power & Ground Input Size: 4 Gauge Speaker Input Size: 12 Gauge Technical Specifications: Monoblock Class D Amplifier Strappable: Yes; Signal Output is Master RMS Power at 1 Ohm: 400 Watts x 1-Ch (14.4v) RMS Power at 2 Ohms: 300 Watts x 1-Ch (14.4v) RMS Power at 4 Ohms: 150 Watts x 1-Ch (14.4v) Recommended External Fuse: 50A Subsonic filter: 0 - 50Hz Frequency response: 20 Hz to 320 Hz LPF: 40-180Hz S/N: 93dB Bass Boost: 0 to 12 dB Bass Boost Frequency: 30-80Hz Input impedance: 22k ohms Operation voltage: DC 9-16V Minimum speaker impedance: 1ohm Remote volume Controller Continuously-Variable Input Gain Control Remote Turn-on/Turn-off circuit MOSFET Pulse Width Modulated Power Supply Soft Turn-on Circuit Thermal and Speaker Short Protection Circuit LED Power and Protection Indicators Mounting Dimensions: 8.38" (Length) * 5.625" (Width) * 2.187" (Height) AMP DYNO VIDEO

Review: This thing runs my single ten-inch Kicker Comp R and it just thumps - This thing runs my single ten-inch Kicker Comp R and it just thumps. It's a great little amp. I'm sure it would run two at 1 ohm perfectly too.
Review: Small but powerful! - I matched this with a shallow Ct sounds hydro 10in and installed in my Kenworth dump truck. Build quality is excellent and it packs a punch for its size. I had to buy the smallest 10in box I could find because I’m limited on space but it powers the sub very well. I have it on the floor which gets pretty hot to the touch from the transmission right underneath and the amp hardly gets warm after continuous hours of listening. Sound quality is great for me I used a o scope to set gains and couldn’t be happier with my purchase. Time will tell and I will report back this winter since I seen some issues with it not working in the cold.

## Features

- Car audio amplifier with 400 watts RMS power at 1-ohm load (14.4v); 300 watts RMS at 2-ohm load (14.4v); 150 watts RMS at 4-ohm load (14.4v); Frequency response: 0 to 320 Hz (Bass Knob Included)
- Small footprint and compact chassis makes this mono amplifier easy to install in any vehicle or car audio application; but don’t let the size fool you, this 400 watt amplifier absolutely pounds
- Engineered to be the most efficient car monoblock amplifier in its class so that you can get the most out of your vehicle’s electrical system
- MOSFET pulse width modulated power supply and proprietary heat dissipation design will ensure the amplifier for car subwoofers runs cool for even the most demanding playlists
- 4-way protection circuitry features high voltage, low voltage, over current, and high-temperature protection; sleep easy at night knowing your class d amplifier car audio is protected

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0971NG7VH |
| Brand | CT Sounds |
| Brand Name | CT Sounds |
| Customer Reviews | 4.3 out of 5 stars 139 Reviews |
| Manufacturer | CT Sounds |
| Material Type | metal and plastic |
| Maximum Output Power | 400 watts |
| Maximum Supply Voltage | 14.4 Volts |
| Maximum supply voltage | 14.4 Volts |
| Minimum Supply Voltage | 8.8 Volts (DC) |
| Minimum supply voltage | 8.8 Volts (DC) |
| Model | CT-400.1D |
| Mounting Type | Surface Mount |
| Mounting type | Surface Mount |
| Number of Channels | 1 |
| Output Power | 400 Watts |
| Package Type Name | box |
| Specification Met | CE, CSA, FCC, RoHS, WEEE |
| UPC | 850021258818 |
| Unit Count | 1 Count |
| Voltage | 14.4 Volts |

## Product Details

- **Manufacturer:** CT Sounds
- **Maximum supply voltage:** 14.4 Volts
- **Minimum supply voltage:** 8.8 Volts (DC)
- **Mounting type:** Surface Mount
- **Voltage:** 14.4 Volts

## Images

![CT-400.1D Compact Class D Car Audio Monoblock Amplifier, 400 Watts RMS - Image 1](https://m.media-amazon.com/images/I/71UsWc0FowL.jpg)

## Questions & Answers

**Q: Apparently this amp doesn't work in the winter time or an early spring or late fall that's kind of weird?**
A: My son runs this amp all year long and has never had a problem. He is only running 2-10's, so maybe that's why. Great amp so far

**Q: Would this work for a 15 inch kicker subwoofer?**
A: That would depend on the specs of the sub( check rms wattage with oh resistance ratings). As long as it falls less than or equal too the ratings of the amp( check the manual online for it's ratings). You could use a high wattage sub 
with it but it won't have as much output vs a wattage matched one.

**Q: Could this amp work for the ct sound strato 8**
A: It will work as long as you don’t try to overpower it. Typically you’ll want to go with a higher rated amp than needed for subwoofer RMS

## Customer Reviews

### ⭐⭐⭐⭐⭐ This thing runs my single ten-inch Kicker Comp R and it just thumps
*by S***O on 3 May 2026*

This thing runs my single ten-inch Kicker Comp R and it just thumps. It's a great little amp. I'm sure it would run two at 1 ohm perfectly too.

### ⭐⭐⭐⭐⭐ Small but powerful!
*by T***R on 25 April 2025*

I matched this with a shallow Ct sounds hydro 10in and installed in my Kenworth dump truck. Build quality is excellent and it packs a punch for its size. I had to buy the smallest 10in box I could find because I’m limited on space but it powers the sub very well. I have it on the floor which gets pretty hot to the touch from the transmission right underneath and the amp hardly gets warm after continuous hours of listening. Sound quality is great for me I used a o scope to set gains and couldn’t be happier with my purchase. Time will tell and I will report back this winter since I seen some issues with it not working in the cold.

### ⭐⭐⭐⭐⭐ Amazed.
*by C***E on 5 June 2023*

This little Amp is no slouch, can't belive its 400 watts! Been doing car audio for quite some time...and this amp for the price is amazing. The build quality is definitely on point, its definitely got some weight to it. very small and compact can go just about anywhere. It's definitely a little power hungry...I almost regret not installing 1/0 gauge power cable and just using reducer at the amp but it's only 400 watts. Got this running 2 CT tropo 6.5s at 1 ohm and the overall setup DOES NOT Disappoint! My only Gripe (or Gripes) would be the bass knob is trash. Very cheap lightweight plastic, I feel like if you just look at it wrong it will break. I didn't even mount the knob because I'm afraid a Tab would bust off while screwing it down. It also has a power LED on the knob which is a blinding blue...I can't even look at it straight on with out it leaving a weird blue fuzz in my eyes for an hour. Other than that, awesome amp, awesome price...I look forward to getting another and strapping them to 4 6.5s 👍

## Frequently Bought Together

- CT Sounds CT-400.1D Compact Class D Car Audio Monoblock Amplifier, 400 Watts RMS
- CT Sounds 4 Gauge CCA Complete Amp Wiring Install Kit, AMPKIT-4GA-PRO
- CT Sounds Single 8” 800W Loaded Tropo Series Ported Car Subwoofer Box - TROPO-1X8D2

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-07-01*