---
product_id: 323276741
title: "In Phase USW12 Dual 6-Inch Underseat Subwoofer | Built-In Amplifier"
brand: "in phase"
price: "$461.76"
currency: USD
in_stock: true
category: "In Phase"
url: https://www.desertcart.us/products/323276741-in-phase-usw12-dual-6-inch-underseat-subwoofer-built-in
store_origin: US
region: United States of America
---

# 75mm ultra-slim depth 600W peak power Die-cast aluminium chassis In Phase USW12 Dual 6-Inch Underseat Subwoofer | Built-In Amplifier

**Brand:** in phase
**Price:** $461.76
**Availability:** ✅ In Stock

## Summary

> 🎵 Feel the bass, not the bulk – upgrade your ride’s sound game!

## Quick Answers

- **What is this?** In Phase USW12 Dual 6-Inch Underseat Subwoofer | Built-In Amplifier by in phase
- **How much does it cost?** $461.76 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/323276741-in-phase-usw12-dual-6-inch-underseat-subwoofer-built-in)

## 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

- • **Remote Bass Control:** Customize your bass on the fly from the driver’s seat.
- • **Built-In 600W Amplifier:** Powerful sound with no extra gear needed.
- • **Ultra-Compact 75mm Profile:** Fits discreetly under seats or in tight spaces.
- • **Dual 6-Inch Aluminium Drivers:** Experience deep, punchy bass without the bulk.
- • **Rugged Die-Cast Aluminium Build:** Durability meets sleek, stealthy design.

## Overview

The In Phase USW12 is a compact, dual 6-inch underseat subwoofer delivering up to 600 watts peak power through two aluminium cone drivers. Its ultra-slim 75mm die-cast aluminium chassis allows versatile installation under seats or in tight vehicle spaces, combining durability with discreet style. Featuring a built-in amplifier and wired remote bass control, it offers powerful, customizable bass without the need for additional equipment, backed by a trusted UK brand and a 3-year warranty.

## Description

In Phase USW12 Dual 6-Inch Underseat Subwoofer | Built-In Amplifier | 600W Peak Active Car Subwoofer | Dual 6-Inch Aluminium Drivers | Slim 75mm Design | Wired Bass & Phase Control : desertcart.co.uk: Electronics & Photo

## Features

- POWERFUL BASS, COMPACT FIT – Add depth and punch to your car audio without sacrificing valuable boot space. At just 75mm deep, the In Phase USW12 can be installed under or behind a suitable seat, in a footwell or in the boot, subject to the space and ventilation available in your vehicle.
- DUAL 6-INCH ALUMINIUM DRIVERS – Two aluminium-cone bass drivers deliver up to 600W peak power, giving music a fuller, more impactful low end. The dual-driver design offers a substantial bass upgrade without the bulk of a traditional full-size subwoofer enclosure.
- BUILT-IN AMPLIFIER, SOLID CONSTRUCTION – The active USW12 combines its amplifier and subwoofers in one compact unit, so no separate amplifier is required. Its rigid die-cast aluminium chassis provides a durable enclosure while helping to keep the installation slim and discreet.
- BASS CONTROL AT YOUR FINGERTIPS – Use the included wired remote to adjust bass gain and switch phase between 0° and 180° from the driver's seat. Fine-tune the bass response to suit your music, listening preferences and the position of the subwoofer inside your vehicle.
- Trusted Brand - In Phase is a UK based brand, our team currently has over 500 years of audio research and development experience, creating quality products from premium material that our customer deserve, including, car audio speakers & subwoofers. 3 year warranty included.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B092ZYGFM4 |
| Antenna Location | Improving the sound of bass in cars |
| Audio Driver Size | 12 Inches |
| Audio Driver Type | Dynamic Driver |
| Audio Output Mode | Stereo |
| Best Sellers Rank | 56,285 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 27 in Car Enclosed Subwoofer Systems |
| Box Contents | USW12 Active Enclosure, Wiring Kit, Mounting Brackets, Remote Bass Controller, Instruction Manual |
| Brand Name | In Phase |
| Colour | USW12 |
| Compatible Devices | Personal Computer |
| Compatible with Vehicle Type | Car |
| Connectivity Protocol | RCA |
| Control Method | Remote |
| Controller Type | Button, Remote Control |
| Country of Origin | China |
| Customer Package Type | FFP |
| Customer Reviews | 4.3 4.3 out of 5 stars (29) |
| Enclosure Material | Aluminium |
| Input Voltage | 12 Volts (DC) |
| Is Waterproof | False |
| Item Dimensions D x W x H | 5D x 16W x 5H centimetres |
| Item Type Name | In Phase Car Audio USW12 600W 12" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium |
| Item Weight | 4.6 Kilograms |
| MP3 player | No |
| Manufacturer | In Phase |
| Maximum Speaker Output Power (in watts) | 600 Watts |
| Model Name | USW12 |
| Model Number | USW12 |
| Mounting Type | Underseat Mount |
| Network Connectivity Technology | RCA |
| Number Of Circuits | 1 |
| Number of Audio Channels | 2.0 |
| Number of Items | 1 |
| Power Source | Electrical system of a vehicle |
| Product Features | Ultra-thin and compact design, Die-cast aluminum construction |
| Product Warranty | 2 year manufacturer |
| Speaker Size | 12 Inches |
| Speaker Type | Subwoofer |
| Specific Uses For Product | In-car audio |
| Subwoofer Connectivity Technology | Wired |
| Subwoofer Speaker Diameter | 12 Inches |
| Tweeter Diameter | 1 Inches |
| Warranty Type | Full |
| Water Resistance Level | Not Water Resistant |
| Wireless Technology Type | No Wireless Communication Technology |
| Woofer Driver Diameter | 12 Inches |

## Product Details

- **Audio output mode:** Stereo
- **Brand:** In Phase
- **Connectivity technology:** RCA
- **Input voltage:** 12 Volts (DC)
- **Material:** Aluminium
- **Model name:** USW12
- **Mounting type:** Underseat Mount
- **Speaker maximum output power:** 600 Watts
- **Speaker type:** Subwoofer
- **Special feature:** Ultra-thin and compact design, Die-cast aluminum construction

## Images

![In Phase USW12 Dual 6-Inch Underseat Subwoofer | Built-In Amplifier - Image 1](https://m.media-amazon.com/images/I/61u0tjTkZEL.jpg)

## Questions & Answers

**Q: What is the power cord called**
A: I don't really understand your question. All cables required are included in the box along with clear instructions.

**Q: I already have inphase 300w installed can i just plug this in and will it work with the same wires i already have installed**
A: I dont know but I imagine all in-phase have the same connections, however all wiring and instructions are included

## Frequently Bought Together

- In Phase USW12 Car Audio 600W 12" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium
- CableMountain RCA Cables 3m - Gold Plated Male-to-Male Phono to Phono Cable | RCA Audio Cable for Amplifier, Turntable, TV, Home Theater, Speakers and HiFi Systems

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-11-14*