---
product_id: 78487996
title: "SS8P 400W 8\" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems"
brand: "rockville"
price: "$343.43"
currency: USD
in_stock: true
reviews_count: 13
category: "Rockville"
url: https://www.desertcart.us/products/78487996-ss8p-400w-8-slim-under-seat-active-subwoofer-high-level
store_origin: US
region: United States of America
---

# 2.8" slim profile 400W peak power Built-in amp & easy install SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems

**Brand:** rockville
**Price:** $343.43
**Availability:** ✅ In Stock

## Summary

> 🚗 Feel the bass, not the bulk — Rockville SS8P powers your ride with sleek, slammin’ sound!

## Quick Answers

- **What is this?** SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems by rockville
- **How much does it cost?** $343.43 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/78487996-ss8p-400w-8-slim-under-seat-active-subwoofer-high-level)

## Best For

- rockville enthusiasts

## Why This Product

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

## Key Features

- • **Ultra-Slim Design:** At just 2.8" thick, fits discreetly under most vehicle seats—perfect for tight spaces in cars, trucks, and SUVs.
- • **Custom-Tune Your Ride:** Adjust bass boost, phase, and gain to tailor your sound experience exactly how you like it.
- • **Plug & Play Simplicity:** Integrated amplifier with high-level inputs and auto turn-on technology for a hassle-free, clean installation.
- • **Durable & Cool Under Pressure:** Cast aluminum enclosure ensures efficient heat dissipation and long-lasting performance on every drive.
- • **Powerful Bass, Minimal Footprint:** 400W peak power delivers deep, immersive low frequencies without sacrificing cabin space.

## Overview

The Rockville SS8P is a compact 8" active subwoofer delivering 400W peak power through a slim 2.8" under-seat design. Featuring a built-in amplifier with high-level inputs, adjustable sound controls, and a durable cast aluminum enclosure, it offers an easy installation and powerful bass enhancement for cars, trucks, and SUVs without compromising space.

## Description

The Rockville SS8P 400W 8" Slim Under-Seat Active Subwoofer adds deep, impactful bass to your car or truck audio system without taking up valuable space. With a compact 2.8" profile, it fits neatly under most vehicle seats, making it ideal for cars, trucks, and SUVs where space is limited.Powerful Audio: An 8" subwoofer delivers 400 watts of peak power and 100 watts RMS, producing rich low-end sound for a more dynamic listening experience.Compact Fit: Slim and sleek, it installs discreetly under your seat, leaving your trunk space free.Simple Setup: Features a built-in amplifier with high-level inputs, auto turn-on technology, and included mounting hardware for a clean, straightforward installation.Customizable Sound: Fine-tune your audio with adjustable bass boost, phase control, low pass filter, and input sensitivity.Reliable Build: The cast aluminum enclosure ensures efficient heat dissipation and durability, built to handle daily driving conditions.Whether you're upgrading a factory system or enhancing your commute, the Rockville SS8P offers big bass in a small footprint-ideal for music lovers who want high-performance sound in any vehicle.

Review: Overall Good Subwoofer to fill in mid-bass - I have a 1993 Saturn SL1 and I have been trying to get adequate bass in the car. For one the car is not very sound proof, you can hear all the road noise, bumps and what not's. The trunk for some reason has very good sound proofing, so it is hard to pass bass from the trunk to the passenger compartment. My set up is fairly simple, I have 2 Crunch PA1400.2 running front and rear, I have a JBL 400w RMS running Rockford Fosgate Prime Dual 10" Sub Box in the trunk. The issue is I can get the thump, but I am missing the mid to mid-bass in the passenger compartment. Since I do not want to cut holes in the rear door to mount additional speakers I found this and thought maybe this will work. I mounted it on the rear parcel shelf right in between the 2 rear speakers. I set the trunk Rockford Fosgate Prime Dual 10 crossover to run from dc to 90 HZ and set the Rockville SS8P 400w 8" Slim crossover to run from 90 HZ to 125 HZ and set the High-pass filter on the front and rear to cut off at 100 HZ. Now you want to talk about bass, this fills in great as a mid to mid-base speaker. I get mid to mid-base fill-in in the passenger compartment and I get the punch and hard hitting base from my subs in the trunk. The product has good built quality, it was easy to install even though i did not install under my seat (as it would not fit) I did call the MFG to find out if mounting it on the parcel shelf with it exposed to direct sunlight would be an issue and they said no it would not as it would have ample air flow, and direct sunlight on the top would not affect the electronics. The manual is straight forward, basically 3 wires, Positive (red), Ground (black) and remote turn on (blue), and RCA plugs. I just wired it into my distribution block, placed on the parcel shelf with adhesive and i was done, did not use the remote control as my deck has that feature built in. I know that my installation may not be standard, or I may not be using the product as designed a "SUBWOOFER" but as a mid to mid-base driver it delivers good solid reproduction in those ranges ( 90 HZ to 125 HZ), no distortion, no rattle in the cone, good disbursement of frequencies. This product did what I wanted it to do was fill in the mid to mid-base range. If you read my review please understand that I am not using this as a "SUBWOOFER", I cannot tell you how it preforms in that aspect, but I can tell you this is a solid product, has good build quality, has good sound ( in reference to my application of the product), has good customer and Technical Support Services, and for only $100 or so a good value.
Review: Great Sound! - Great sub! Easy install and the quality is there. The 10’ sub gives a great thump and fills the lower end nicely. It won’t rattle windows but the sound is clear and crisp. It does not sound distorted. The enclosure is compact, sturdy and fits under my seat. I will say that sitting in different areas of the car change the fullness of the sound. I have it under my driver seat and it sounds great but when I sit in the passenger rear seat, I don’t hear the bass as profound as I do when I’m sitting in the driver seat. Overall, I would highly recommend it. Especially for the price compared to some of the other products on here. I used a Boss 8gauge amp wire kit for my install and works perfect. Maybe a 4gauge would be preferred to prevent any overheating but an 8 is good enough. Oxygen Free cables would be the go to but I cheaped out. If you’re on the fence about it let me give you the nudge to get it! I think it’s great and worth the 100$ for an inclusive compact sub. DO IT!!!

## Features

- DEEP BASS PERFORMANCE: Delivers 400W peak power with an 8" subwoofer for rich, immersive low frequencies in your car or truck audio system.
- SPACE-SAVING DESIGN: Slim 2.8" profile fits under most vehicle seats, maximizing space while providing powerful bass for small cars, trucks, or SUVs.
- BUILT-IN AMPLIFIER: Integrated amp simplifies setup, with high-level inputs and auto turn-on technology, plus adjustable controls for bass, phase, and gain.
- EASY INSTALLATION: Includes mounting hardware and remote bass knob for quick setup; compatible with factory or aftermarket audio systems.
- DURABLE CONSTRUCTION: Cast aluminum enclosure helps dissipate heat and keeps the subwoofer cool, ensuring long-lasting, reliable performance.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B079PRCP9W |
| Additional Features | Subwoofer, Waterproof, USB Charging, Built-in Microphone |
| Antenna Location | Car |
| Audio Driver Size | 8 Inches |
| Audio Driver Type | Dynamic Driver |
| Audio Output Mode | Stereo |
| Best Sellers Rank | #8,241 in Electronics ( See Top 100 in Electronics ) #43 in Car Component Subwoofers |
| Brand | Rockville |
| Built-In Media | Subwoofer |
| Color | black |
| Compatible Devices | Car, Truck |
| Compatible with Vehicle Type | Car, Truck |
| Connectivity Protocol | wired |
| Connectivity Technology | Bluetooth |
| Control Method | Remote |
| Controller Type | Remote Control |
| Customer Package Type | Standard Packaging |
| Customer Reviews | 4.4 out of 5 stars 3,609 Reviews |
| Enclosure Material | Aluminum |
| Frequency Response | 20 Hz |
| Global Trade Identification Number | 00819216020937 |
| Impedance | 4 Ohms |
| Input Voltage | 300 Millivolts |
| Is Waterproof | False |
| Item Dimensions D x W x H | 16"D x 12"W x 5"H |
| Item Type Name | Rockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer Sub |
| MP3 player | No |
| Manufacturer | Rockville |
| Maximum Range | 10 Meters |
| Model Name | SS8P |
| Model Number | SS8P |
| Mounting Type | Under Seat Mount |
| Number of Audio Channels | 1.0 |
| Number of Items | 496 |
| Signal-to-Noise Ratio | 90 dB |
| Speaker Maximum Output Power | 400 Watts |
| Speaker Size | 8 Inches |
| Speaker Type | Subwoofer |
| Specific Uses For Product | Vehicle sound systems |
| Subwoofer Connectivity Technology | Wired |
| Subwoofer Diameter | 8 Inches |
| UPC | 819216020937 |
| Unit Count | 1.0 Count |
| Warranty Description | 1 YEAR |
| Warranty Type | Limited |
| Water Resistance Level | Not Water Resistant |
| Woofer Diameter | 8 Inches |

## Product Details

- **Audio Output Mode:** Stereo
- **Brand:** Rockville
- **Connectivity Technology:** Bluetooth
- **Frequency Response:** 20 Hz
- **Speaker Maximum Output Power:** 400 Watts

## Images

![SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems - Image 1](https://m.media-amazon.com/images/I/710QlUy+RzL.jpg)
![SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems - Image 2](https://m.media-amazon.com/images/I/716b5Ih1+yL.jpg)
![SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems - Image 3](https://m.media-amazon.com/images/I/71Hsz9TCJ9L.jpg)
![SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems - Image 4](https://m.media-amazon.com/images/I/71xEsF0rJEL.jpg)
![SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems - Image 5](https://m.media-amazon.com/images/I/71yJcQsSevL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Overall Good Subwoofer to fill in mid-bass
*by R***E on February 8, 2019*

I have a 1993 Saturn SL1 and I have been trying to get adequate bass in the car. For one the car is not very sound proof, you can hear all the road noise, bumps and what not's. The trunk for some reason has very good sound proofing, so it is hard to pass bass from the trunk to the passenger compartment. My set up is fairly simple, I have 2 Crunch PA1400.2 running front and rear, I have a JBL 400w RMS running Rockford Fosgate Prime Dual 10" Sub Box in the trunk. The issue is I can get the thump, but I am missing the mid to mid-bass in the passenger compartment. Since I do not want to cut holes in the rear door to mount additional speakers I found this and thought maybe this will work. I mounted it on the rear parcel shelf right in between the 2 rear speakers. I set the trunk Rockford Fosgate Prime Dual 10 crossover to run from dc to 90 HZ and set the Rockville SS8P 400w 8" Slim crossover to run from 90 HZ to 125 HZ and set the High-pass filter on the front and rear to cut off at 100 HZ. Now you want to talk about bass, this fills in great as a mid to mid-base speaker. I get mid to mid-base fill-in in the passenger compartment and I get the punch and hard hitting base from my subs in the trunk. The product has good built quality, it was easy to install even though i did not install under my seat (as it would not fit) I did call the MFG to find out if mounting it on the parcel shelf with it exposed to direct sunlight would be an issue and they said no it would not as it would have ample air flow, and direct sunlight on the top would not affect the electronics. The manual is straight forward, basically 3 wires, Positive (red), Ground (black) and remote turn on (blue), and RCA plugs. I just wired it into my distribution block, placed on the parcel shelf with adhesive and i was done, did not use the remote control as my deck has that feature built in. I know that my installation may not be standard, or I may not be using the product as designed a "SUBWOOFER" but as a mid to mid-base driver it delivers good solid reproduction in those ranges ( 90 HZ to 125 HZ), no distortion, no rattle in the cone, good disbursement of frequencies. This product did what I wanted it to do was fill in the mid to mid-base range. If you read my review please understand that I am not using this as a "SUBWOOFER", I cannot tell you how it preforms in that aspect, but I can tell you this is a solid product, has good build quality, has good sound ( in reference to my application of the product), has good customer and Technical Support Services, and for only $100 or so a good value.

### ⭐⭐⭐⭐⭐ Great Sound!
*by L***O on September 11, 2025*

Great sub! Easy install and the quality is there. The 10’ sub gives a great thump and fills the lower end nicely. It won’t rattle windows but the sound is clear and crisp. It does not sound distorted. The enclosure is compact, sturdy and fits under my seat. I will say that sitting in different areas of the car change the fullness of the sound. I have it under my driver seat and it sounds great but when I sit in the passenger rear seat, I don’t hear the bass as profound as I do when I’m sitting in the driver seat. Overall, I would highly recommend it. Especially for the price compared to some of the other products on here. I used a Boss 8gauge amp wire kit for my install and works perfect. Maybe a 4gauge would be preferred to prevent any overheating but an 8 is good enough. Oxygen Free cables would be the go to but I cheaped out. If you’re on the fence about it let me give you the nudge to get it! I think it’s great and worth the 100$ for an inclusive compact sub. DO IT!!!

### ⭐⭐⭐⭐ compact size, decent bass
*by R***S on April 14, 2026*

surprisingly good for the money! I added it (with much difficulty) to my 2020 Mazda6 (non-Bose) stereo. This would have been an easier install if the factory stereo had rca pre-outs. Compact size fit right under the passenger seat and the extra bass really makes stock system sound pretty good.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-14*