---
product_id: 48479427
title: "In Phase Car Audio USW10 300W 10\" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black"
brand: "in phase"
price: "$309.15"
currency: USD
in_stock: true
reviews_count: 13
category: "In Phase"
url: https://www.desertcart.us/products/48479427-in-phase-car-audio-usw10-300w-10-underseat-ultra-slim
store_origin: US
region: United States of America
---

# Ultra slim 69mm depth 300W max output Die-cast aluminium chassis In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black

**Brand:** in phase
**Price:** $309.15
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your drive with bass that’s as sleek as your style.

## Quick Answers

- **What is this?** In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black by in phase
- **How much does it cost?** $309.15 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/48479427-in-phase-car-audio-usw10-300w-10-underseat-ultra-slim)

## Best For

- in phase enthusiasts

## Why This Product

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

## Key Features

- • **Seamless Compatibility:** Works effortlessly with both OEM and aftermarket head units via RCA and high-level inputs—upgrade your ride’s sound instantly.
- • **Sleek Underseat Design:** Ultra-slim 69mm depth fits discreetly under seats or tight vehicle spaces—bass that hides in plain sight.
- • **Intuitive Remote Control:** Fine-tune your bass on the fly with a 5-meter remote—no more awkward access or guesswork during your drive.
- • **Robust British Engineering:** Die-cast aluminium chassis ensures durability and premium sound quality crafted with 30+ years of UK audio expertise.
- • **Powerful Bass in a Compact Frame:** 300W amplifier drives an aluminium coned 10" subwoofer for deep, punchy lows without bulk.

## Overview

The In Phase USW10 is a compact, 10-inch underseat active subwoofer delivering up to 300W of powerful bass through an aluminium coned driver housed in a durable die-cast aluminium chassis. Designed in the UK with over 30 years of audio expertise, it fits discreetly in tight vehicle spaces and offers versatile connectivity with RCA and high-level inputs. Included remote control allows easy bass adjustment, making it a perfect upgrade for both factory and aftermarket car audio systems.

## Description

From the manufacturer Compact Design Measuring a mere 69mm in depth and 270mm in diameter, this unique unit will fit easily in just about any location in your vehicle while still packing a powerful bass punch. Multiple Use Subwoofer Overall, this is a very good subwoofer. It can be enjoyed as a basic upgrade or as part of a premium audio system. Easy Installation This subwoofer can be installed into a factory system, using High-Level Input, or into an Aftermarket system using RCA input. Compact yet Powerfull Subwoofer Looking for a subwoofer that has all that bass pumping power but doesn’t need a lot of space? Look no further. With a built in amplifier powering an aluminum coned subwoofer and a max output of 300W the In Phase USW10 is a true pocket powerhouse of audio performance. USW10 300W 10" Underseat Subwoofer Specifications

Review: Fantastic value for money, easy to install. - + Great Sound, Great Quality, Easy to Install, Fantastic Value. - No RCA Leads. This is a great little sub if you’re after a fuller sound for your car. I installed a set of component speakers into a Kangoo van and was disappointed with the bass, so I fitted this and it’s made a massive difference! It’s a substantial well built item and has all the sound controls on the remote instead of fiddly dials on the back of the unit which makes it great to tune while it’s situ without messing around accessing it again. It comes with all the leads you need to get it running via high level input, but you will need to but a phono lead if you want to connect it via low level RCA.
Review: Great subwoofer - Great sound, full kit included for install, you might want to watch a few YouTube videos on how to install. Fits under the passenger seat so perfect size, 10/10 and glad I went with the British design over my usual choice of Pioneer for anything sound

## Features

- ALUMINIUM CONED SUBWOOFER - With a built in amplifier powering an aluminium coned subwoofer and a max output of 300W, the In Phase USW10 is a true pocket powerhouse of audio performance
- HEAVY DUTY DURABLE CONSTRUCTION - 6" Aluminium coned sub bass driver housed in a DieCast Aluminium chassis
- COMPACT AND DISCRETE - Allowing you to install the USW10 anywhere within your vehicles Boot, Underseat, behind seat and foot wells. Dimensions 270mm (D) x 65mm (H)
- REMOTE CONTROL - Bass remote included (5 meters)
- COMPTABILITY - RCA and High Level inputs (will work with both OEM and Factory Fitted head units).
- BRITISH DESIGN - All In Phase speakers are designed in the UK utilising over 30 years of audio experience to create a sound that is right for you

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004UFII6O |
| Antenna Location | For music players |
| Audio Driver Size | 10 Inches |
| Audio Driver Type | Dynamic Driver |
| Audio Output Mode | Surround |
| Audio output mode | Surround |
| Battery Average Life | 5 Hours |
| Best Sellers Rank | 4,964 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 5 in Car Component Subwoofers |
| Bluetooth Range | 5 Metres |
| Box Contents | Car Subwoofer Active Enclosure, Wiring Kit, Mounting Brackets, Remote Controller, Instruction Manual |
| Brand | In Phase |
| Brand Name | In Phase |
| Colour | Black |
| Compatible Devices | [SOME] |
| Connectivity Protocol | RCA |
| Connectivity technology | RCA |
| Control Method | Remote |
| Controller Type | Remote Control |
| Country of Origin | China |
| Customer Package Type | Flat Free Package (FFP) |
| Customer Reviews | 4.4 out of 5 stars 566 Reviews |
| Enclosure Material | Metal/plastic |
| Global Trade Identification Number | 09402560901666 |
| Impedance | 8 Ohms |
| Is Waterproof | False |
| Item Dimensions D x W x H | 34D x 14W x 32H centimetres |
| Item Type Name | 10 Underseat Active Subwoofer |
| Item Weight | 4.6 Kilograms |
| MP3 player | No |
| Manufacturer | IN PHASE Audio |
| Material | Metal/plastic |
| Maximum Range | 10 Metres |
| Maximum Speaker Output Power (in watts) | 300 Watts |
| Model Name | USW10 |
| Model Number | USW10 |
| Mounting Type | Tabletop Mount |
| Mounting type | Tabletop Mount |
| Network Connectivity Technology | RCA |
| Number Of Circuits | 1 |
| Number of Audio Channels | 2.0 |
| Number of Items | 1 |
| Power Source | Corded Electric |
| Product Features | Amplifier |
| Speaker Size | 10 Inches |
| Speaker Type | Subwoofer |
| Speaker maximum output power | 300 Watts |
| Specific Uses For Product | Improve sound quality during car journeys, discreet placement in different areas |
| Subwoofer Connectivity Technology | Wired |
| Subwoofer Speaker Diameter | 6 Inches |
| Tweeter Diameter | 1 Inches |
| Warranty Type | Limited |
| Water Resistance Level | Not Water Resistant |
| Wireless Technology Type | No wireless communication technology |
| Woofer Driver Diameter | 10 Inches |

## Product Details

- **Audio output mode:** Surround
- **Brand:** In Phase
- **Connectivity technology:** RCA
- **Material:** Metal/plastic
- **Model name:** USW10
- **Mounting type:** Tabletop Mount
- **Recommended uses for product:** For music players
- **Speaker maximum output power:** 300 Watts
- **Speaker type:** Subwoofer
- **Special feature:** Amplifier

## Images

![In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black - Image 1](https://m.media-amazon.com/images/I/61NL7iczc1L.jpg)
![In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black - Image 2](https://m.media-amazon.com/images/I/61ltptl8oiS.jpg)
![In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black - Image 3](https://m.media-amazon.com/images/I/41AjDqK7NES.jpg)
![In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black - Image 4](https://m.media-amazon.com/images/I/61-ijthrjlL.jpg)
![In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black - Image 5](https://m.media-amazon.com/images/I/61eubtbYuZL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can you or is there an adaptor to use at home / plug into the mains?**
A: If you have an adaptor 230/12 Volt then you can use this equipment at home but this has to be powerful.

**Q: will it do 33Htz**
A: You can find in the manual it's working between 50 - 100 Hertz and 50 Hz is the standard Hi-fi low transmission there is no seeker what can work until this.

**Q: dimensions of the item, not the package.**
A: Measuring a mere 69mm in depth and 270mm in diameter,

**Q: I have the 300w version. Would the 600w version be compatible with the cables from the 300w version as i dont want to mess around with cables?**
A: I don't know the bigger version but I think it should be good for another type of this

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fantastic value for money, easy to install.
*by A***M on 17 February 2025*

+ Great Sound, Great Quality, Easy to Install, Fantastic Value. - No RCA Leads. This is a great little sub if you’re after a fuller sound for your car. I installed a set of component speakers into a Kangoo van and was disappointed with the bass, so I fitted this and it’s made a massive difference! It’s a substantial well built item and has all the sound controls on the remote instead of fiddly dials on the back of the unit which makes it great to tune while it’s situ without messing around accessing it again. It comes with all the leads you need to get it running via high level input, but you will need to but a phono lead if you want to connect it via low level RCA.

### ⭐⭐⭐⭐⭐ Great subwoofer
*by L***M on 10 May 2026*

Great sound, full kit included for install, you might want to watch a few YouTube videos on how to install. Fits under the passenger seat so perfect size, 10/10 and glad I went with the British design over my usual choice of Pioneer for anything sound

### ⭐⭐⭐⭐ Great value, this does the job.
*by A***. on 9 February 2022*

For the price I can't complain. This does the job if you want to add a little low end and space is limited. It's not too difficult to install if you understand basic wiring. The sound quality isn't audiophile but it will improve any standard set up that lacks the low end. It has an adjustable crossover and gain controls on the unit itself, and an additional remote volume control. What's more it fits neatly under most car seats. You don't need to buy any additional equipment to get this going, all the wiring is also provided. Ok so maybe the bass isn't very tight, it's not going to compare to a 12 inch sub box booming insane levels of bass in your boot but it's an underseat space saving 6" woofer with a built-in amp (active) for less than £150, it is a massive improvement to standard car speakers. Personally I dial the crossover from my head unit (car stereo) as it has a sub out, this will give better results but you can use your factory stereo and wire in using the speaker connections on the back. It's never going to compete with a proper sub but it's nice and compact and provides the extra bass I was missing without breaking the bank. Edit: I've been using this unit for a while now and no complaints. I actually take the longer way home so I can enjoy the music 🎶

## Frequently Bought Together

- In Phase Car Audio USW10 300W 10" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium , Black
- VIBE Audio Slick 1500 W System Car Wiring Kit

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-10*