---
product_id: 436348969
title: "In Phase Car Audio XTB-828R 8\" 400W Active Subwoofer with Passive Radiator and Class D Amplifer , Black"
brand: "in phase"
price: "S/.2092"
currency: PEN
in_stock: true
reviews_count: 13
category: "In Phase"
url: https://www.desertcart.pe/products/436348969-in-phase-car-audio-xtb-828r-8-400w-active-subwoofer
store_origin: PE
region: Peru
---

# 8" Glass Fibre Subwoofer Cone Compact 16W x 5D x 5H cm footprint 400W Class D Amplifier In Phase Car Audio XTB-828R 8" 400W Active Subwoofer with Passive Radiator and Class D Amplifer , Black

**Brand:** in phase
**Price:** S/.2092
**Availability:** ✅ In Stock

## Summary

> 🎶 Small Sub, Big Vibes: Feel Every Beat Without Sacrificing Space!

## Quick Answers

- **What is this?** In Phase Car Audio XTB-828R 8" 400W Active Subwoofer with Passive Radiator and Class D Amplifer , Black by in phase
- **How much does it cost?** S/.2092 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/436348969-in-phase-car-audio-xtb-828r-8-400w-active-subwoofer)

## 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

- • **Space-Savvy Design:** Slim, desktop-sized footprint fits seamlessly into your vehicle, preserving valuable cargo room.
- • **Durable Glass Fibre Cone:** Lightweight yet rigid cone ensures crisp, distortion-free bass that lasts.
- • **Plug-and-Thump Convenience:** Auto power feature and high-level input simplify installation—no extra cables needed.
- • **Powerful Punch in a Compact Package:** 400W Class D amplifier delivers deep, room-shaking bass without hogging your trunk space.
- • **Precision Bass with Passive Radiator:** Innovative passive radiator enhances low-frequency response for richer, fuller sound.

## Overview

The In Phase Car Audio XTB-828R is a sleek 8-inch active subwoofer boasting a 400W Class D amplifier and a passive radiator for enhanced bass depth. Its compact design fits easily into tight spaces, while the durable glass fibre cone ensures high-quality sound. Ideal for professionals seeking powerful, space-efficient audio upgrades with hassle-free installation.

## Description

In Phase Car Audio XTB-828R 8" 400W Active Subwoofer with Passive Radiator and Class D Amplifer , Black : desertcart.co.uk: Electronics & Photo

Review: Thumping bass - For such a small sub this thing thumps nicely. It’s enough to make the mirrors shake. It won’t drop as hard as a big 12, but it certainly punches well above its weight. Seriously impressive and amazing value considering it’s active. The high level input also works well as does the auto power feature so no need to run rca or remote power cables
Review: Great little sub - After upgrading speakers and adding an amplifier to my Transit custom I was still not happy with the sound. Once I installed this subwoofer that all changed as it has balanced the whole system and has added a good thumping base. Highly recommend!

## Features

- PASSIVE RADIATOR: a speaker with no voice coil or magnet, basically a speaker cone. This is not connected to the amp at all
- COMPACT DESIGN: This sub is only the size of a small desktop computer case. This small footprint allows the user to add thumping bass without compromising space in the boot
- SUPERIOR SUBWOOFER CONE: The glass fibre subwoofer cone is purpose built for this package, it is lightweight, durable and rigid without compromising sound quality
- Power Source Type: Corded Electric

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09ZPMVHCV |
| Best Sellers Rank | 44,782 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 21 in Car Enclosed Subwoofer Systems |
| Colour | Black |
| Compatible devices | Personal Computer |
| Control method | Voice |
| Customer Reviews | 4.1 4.1 out of 5 stars (38) |
| Date First Available | 6 May 2022 |
| Included components | All Cables Included, Remote Bass Gain |
| Is waterproof | False |
| Item Weight | 7.82 kg |
| Item model number | XTB-828R |
| Manufacturer | In Phase |
| Manufacturer part number | XTB-828R |
| Number of items | 1 |
| Power source | Corded Electric |
| Product dimensions | 5D x 16W x 5H centimetres |
| Speaker size | 8 Inches |
| Special Features | Passive Radiator |
| Surround-sound channel configuration | 2.0 |
| Warranty type | Limited |
| Wattage | 400 watts |
| Wireless communication technology | No Wireless Communication Technology |

## Product Details

- **Audio output mode:** Stereo
- **Brand:** In Phase
- **Connectivity technology:** RCA
- **Material:** Metall/Kunststoff
- **Model name:** In Phase XTB-828R
- **Mounting type:** Car Mount
- **Recommended uses for product:** car
- **Speaker maximum output power:** 300 Watts
- **Speaker type:** Subwoofer
- **Special feature:** Passive Radiator

## Images

![In Phase Car Audio XTB-828R 8" 400W Active Subwoofer with Passive Radiator and Class D Amplifer , Black - Image 1](https://m.media-amazon.com/images/I/71Mx3YPh7KL.jpg)

## Questions & Answers

**Q: How is this wired up pls**
A: you need to buy audio cables (red and black) they go to your stereo. The blue wire also to stereo. 12v from positive battery. And 0v (ground) to negative battery

**Q: Is the wiring included lilke as advised**
A: Yes all the wires were included if ever a mistake was made I would still recommend this is very reliable strongly built and gives good bass that 10x it's size

## Customer Reviews

### ⭐⭐⭐⭐⭐ Thumping bass
*by D***S on 28 September 2022*

For such a small sub this thing thumps nicely. It’s enough to make the mirrors shake. It won’t drop as hard as a big 12, but it certainly punches well above its weight. Seriously impressive and amazing value considering it’s active. The high level input also works well as does the auto power feature so no need to run rca or remote power cables

### ⭐⭐⭐⭐⭐ Great little sub
*by S***E on 2 June 2024*

After upgrading speakers and adding an amplifier to my Transit custom I was still not happy with the sound. Once I installed this subwoofer that all changed as it has balanced the whole system and has added a good thumping base. Highly recommend!

### ⭐ Good while it lasted
*by S***T on 4 December 2023*

Was great and produced outstanding bass for an 8" sub, while it lasted. Used including wiring kit and after roughly 30 mins when turned car off and on again it started flicking in to protection mode when the bass hit. Did various troubleshooting including running to another earthing point (sanding paint off so get a good earth), checked voltage from car and producing 14.1v when engine running. Also swapped rca cable and even tried headphone jack to rca cable to rule out my pioneer stereo but still unable to resolve. Returned.

## Frequently Bought Together

- In Phase Car Audio XTB-828R 8" 400W Active Subwoofer with Passive Radiator and Class D Amplifer , Black
- VIBE Audio Slick 1500 W System Car Wiring Kit

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**Shop now:** [https://www.desertcart.pe/products/436348969-in-phase-car-audio-xtb-828r-8-400w-active-subwoofer](https://www.desertcart.pe/products/436348969-in-phase-car-audio-xtb-828r-8-400w-active-subwoofer)

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*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-01-28*