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Rockville

Rockville SS8P 400W 8" Slim Under-Seat Active Subwoofer, High-Level Inputs, Cast Aluminum Enclosure, for Car/Truck Audio Systems

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Availability: In Stock.
Fulfilled by Audiosavings
Arrives Wednesday, Mar 4
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Size: 8"


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.

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.

Brand: Rockville


Speaker Maximum Output Power: 400 Watts


Frequency Response: 20 Hz


Connectivity Technology: Bluetooth


Audio Output Mode: Stereo


Input Voltage: 300 Millivolts


Mounting Type: Under Seat Mount


Material: Aluminum


Model Name: SS8P


Speaker Type: Subwoofer


Special Feature: Subwoofer, Waterproof, USB Charging, Built-in Microphone


Recommended Uses For Product: Car


Compatible Devices: Car, Truck


Subwoofer Diameter: 8 Inches


Unit Count: 1.0 Count


Surround Sound Channel Configuration: 1.0


Color: black


Included Components: Subwoofer


Product Dimensions: 16"D x 12"W x 5"H


Impedance: 4 Ohms


Is Waterproof: False


Warranty Type: Limited


Maximum Range: 10 Meters


Number of Items: 496


Control Method: Remote


Speaker Size: 8 Inches


Signal-to-Noise Ratio: 9E+1 dB


Woofer Diameter: 8 Inches


Water Resistance Level: Not Water Resistant


Customer Package Type: Standard Packaging


Audio Driver Type: Dynamic Driver


Audio Driver Size: 8 Inches


Subwoofer Connectivity Technology: Wired


Specific Uses For Product: Vehicle sound systems


UPC: 819216020937


Style: 8” Under-Seat


Global Trade Identification Number: 37


Manufacturer: Rockville


Item Weight: 8.78 pounds


Item model number: SS8P


Is Discontinued By Manufacturer: No


Date First Available: February 8, 2018


Department: vehicle-subwoofers


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Mar 4

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Great Sound!
Size: 10"
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!!! ... show more
Reviewed in the United States on September 11, 2025 by Leonardo
    • Great Sound Quality
Size: 8"
Replaced my crappy boss stereo and speakers in my car with Pioneer and Kicker so when it came time to get a powered sub I was hesitant to go with a budget brand. I believe that you usually get what you pay for but it was hard to justify more that twice the price for a brand like JBL so I took a chance on the Rockville 8" unit. I'm super happy with the results! I'm not trying to blow my doors off with bass, I'm just wanted something to fill in the low end that was missing with my 5.25" Kickers. This powered sub is fit the bill perfectly. It was easy to install and is so small it actually fits under the seat of my 74 VW beetle. The sound quality is great and it blends really well with the rest of my system. 10/10 recommend. ... show more
Reviewed in the United States on November 14, 2025 by shawn wood
    • Temper your expectations
Size: 10"
Review Image by Danny Danny
It's ok. I placed my powered sub in the back of my Prius, I can hear it but not anything crazy. Decent mids, probably like 80hz but definitely not getting anything 50hz or lower. Was hoping for something a bit louder and lower in the Hz range. Definitely nothing close to 800W, not even sure why the packaging uses that number. I even doubt the 200W RMS rating. Sounds like something closer to 100W. Pros: Small footprint, could fit under my seat Adds some mid bass Bass knob works and is pretty nice Value is pretty decent, especially compared to the price of other name brands You are not going to go deaf lol Cons: Not loud, it reaches its peak at about 50% of my volume, speakers overwhelm it and hard to hear when car is moving with wind noise. Nowhere close to sounding like 800W peak. If you are just looking for a bit of bass, this is not a bad starting point. If you are looking for deeper bass, definitely not for you. This will likely be enough for like 80% of the population. ... show more
Reviewed in the United States on August 24, 2025 by Danny Danny
    • Very Nice Sub for the Price... Added a second 1! Update # 4
Size: 8"
Review Image by DhDolphns DhDolphns
Review Image by DhDolphns DhDolphns
Review Image by DhDolphns DhDolphns
Review Image by DhDolphns DhDolphns
Review Image by DhDolphns DhDolphns
This Sub (not really a Sub but whatever you want to call it) is very nice for the price IF you have a factory stereo or an aftermarket stereo with no amps connected..But you shouldnt expect this thing to play real loud..I got it hoping it would be a little louder for my system..have a 100x4 amp with Alpine 6x9s and 6.5 door components,,at low to moderate sound it is fine almost perfect but if you have a loud system when you play it loud this speaker will got overpowered . And thats with the gain at max and the bass boost at near max. I placed it behind driver seat in a 04 Grand Prix...under the seat I felt it didnt sound as good..I doubt I will keep it in my current set up but will probably keep it for the second car since the freight to return it would be to much to merit returning it. I give it 5 stars for the price and performance on non amped stereos and 3 stars for How much I like it in my system If you have a non high powered stereo and you wont put it in the trunk (you cant tell its there in a trunk) then for the price I think you will love it. UPDATE::: Ok I have had this sub for about 7 months and have had hooked up 3 different ways..( all we're with my above mentioned speakers and amp)) FIRST.was connected to factory radio which is what my review was made..then SECOND OFF I installed a Sony deck and it made the sub sound a noticeabley better and was little more impressed with the sub..THIRD OFF I went back to my factory deck but installed a Clarion EQS755 equalizer and OMG what a difference unreal how much bass this Sub puts out now! I even had to turn the Sub gain down to 1/2 way ( I had it at 3/4 before EQ)and again it sounds unreal for a 8" Sub (again I have it behind front seat on rear seat floorboard)BUT for some reason it kept cutting off with the Clarion don't know why so I am back to having it connected to the Sony Deck and I will say even when I have it up very loud you do notice it and t makes a difference ( when I turn it off with the deck you see what a difference it makes.) Through all my connections I would say a aftermarket deck will make the most difference as compared to a factory deck ( it got drowned out easier with the factory deck) I don't listen to rap or hip hop mostly hard rock / rock .. if you listen to rap and hip hop I doubt you will be as impressed as it struggles with super low bass ( but it's a 8" sub so I doubt anyone would think it would rock with rap or hip hop) If it lasts its an absolute steal now! I now give it 5 stars! UPDATE #2…........ I know have 2 of these installed in my car 1 behind driver seat and 1 behind passenger seat and adding the second one made a big difference ( no duh! Right?) And with adding the second one the subs never get "drowned out" by my amped speakers and at times it's to much bass to be honest but loving this lil sub big time! No it's not "audiophile" quality and it doesn't hit like two 10s or 12's but with the subs on the floorboard I don't have that God awfull trunk rattle sound on the outside that I have had in the past when I had subs in the trunk (not to mention I can use all of my trunk without a huge sub box in it) my rear view mirror vibrates like crazy at times ( it vibrated when I had just the 1 also) but no it won't vibrate your side view mirrors in case you were curious...people have gotten in my car I asked what subs I had in the trunk ( they didn't notice I had 2 of these on the rear floorboards). I know most people don't plan on getting 2 of these (again 1 will be noticeable) but if your thinking of getting 2 or adding another one to your excisting sub.. Do it! Also I don't currently bus the amp gain dash knob but since my decks sub volume adjustment seems to be all or nothing I plan to add the knob but will wire both subs to 1 gain knob.. UPDATE#3 Thought I would make another update since I am sure some people (and some reviews) have had problems with it lasting..Well I am at almost 2 years (1st one was installed Aug/2018 2nd one Dec/2018) and I have never had a problem with either on although when I had just the 1 and I was driving for over an hour with stereo cranked it id go into protective mode 1 time... But other than that they work perfect and sound great (for the price and knowing these arent going to be heard blocks away...But again I have a 100watt rms Pioneer GM-D8704 powering rear JBL 6x9s and front JBL 6.5 compoents and both subs are more than enough to keep up and at times sounds like I have 10s ..Just 1 had a lil harder time keeping up and at times got overpowered but that never happens with 2 unless I want to make my ears bleed. UPDATE #4 May 2025---- I still had both of these and they both still work after getting years of use, dont have a car to put them in since I recently got rid of my 2016 Ford Fusion Titanium W/Sony stereo ... man did I get moneys worth out of them!! ... show more
Reviewed in the United States on August 14, 2018 by DhDolphns DhDolphns
    • When bass is good (loud enough at sane levels) and affordable!
Size: 10"
This is an excellent, inexpensive, solution for adding bass to a unpowered or low powered car audio system. The bass is a welcomed addition to the listening experience. If you're looking to flex the vehicles' windows with bass, forget this product. I find it to be "just right" for listening to music at sane levels while driving. Rockville has provided a feature rich product for a very reasonable amount of money. It sounds great and fills in the bass nicely. Two thumbs up and highly recommended. ... show more
Reviewed in the United States on December 22, 2025 by John Keating

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