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.
Arrives
Thursday, Jun 4
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
Audio Output Mode: Stereo
Mounting Type: Under Seat Mount
Enclosure Material: Aluminum
Speaker Type: Subwoofer
Additional Features: Subwoofer, Waterproof, USB Charging, Built-in Microphone
Antenna Location: Car
Subwoofer Diameter: 8 Inches
Color: black
Is Waterproof: False
Warranty Type: Limited
Maximum Range: 10 Meters
Control Method: Remote
Speaker Size: 8 Inches
Woofer Diameter: 8 Inches
Water Resistance Level: Not Water Resistant
Specific Uses For Product: Vehicle sound systems
MP3 player: No
Controller Type: Remote Control
Frequency Response: 20 Hz
Number of Audio Channels: 1.0
Impedance: 4 Ohms
Signal-to-Noise Ratio: 90 dB
Compatible Devices: Car, Truck
Compatible with Vehicle Type: Car, Truck
Brand: Rockville
Model Number: SS8P
Model Name: SS8P
Built-In Media: Subwoofer
Warranty Description: 1 YEAR
Number of Items: 496
Customer Package Type: Standard Packaging
UPC: 819216020937
Global Trade Identification Number: 37
Manufacturer: Rockville
Item Type Name: Rockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer Sub
Speaker Maximum Output Power: 400 Watts
Input Voltage: 300 Millivolts
Unit Count: 1.0 Count
Item Dimensions D x W x H: 16"D x 12"W x 5"H
Connectivity Technology: Bluetooth
Subwoofer Connectivity Technology: Wired
Connectivity Protocol: wired
Audio Driver Type: Dynamic Driver
Audio Driver Size: 8 Inches
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jun 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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
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!!!
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Reviewed in the United States on September 11, 2025 by Leonardo
Size: 8"
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!!
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Reviewed in the United States on August 14, 2018 Reviewed in the United States on August 14, 2018 by DhDolphns
Size: 8"
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.
Reviewed in the United States on April 14, 2026 by Russ
Size: 8"
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.
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Reviewed in the United States on February 8, 2019 by Robert Bruce
Size: 10"
I call it my mid-life crisis. I’ve wanted a subwoofer in my car since I was 16. I will be 50 in a couple of months. It installed perfectly. I recommend you use 8 gage wire for it. I used 4 gage and it was so much more difficult to run the wire. This thing thumps. Just the right amount of bass. It wired into my stock stereo perfectly. I used AI to confirm the wiring harness location. I have had 0 issues.
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Reviewed in the United States on May 14, 2026 by Joshua
Size: 10"
Firstly, I used 4 gauge wire for the power and ground on this unit. I could have used 8 gauge but i didn't want any possibility of voltage drop or heat to be generated. Also, since my 2013 Kia Optima stock radio had no RCA hookups in the back, I installed a "Kicker 46KISLOC2 Speaker Wire-to-RCA Line-Out Converter w/LOC+12v Turn on Lead" to make the install easier, although the package does include connections for a radio with no RCA output. I ran an aftermarket wiring kit's supplied speaker wire (I mention which kit in a moment) all the way to under my seat to connect to the RCA Converter because in case a set of RCA cables go bad, it's easier to replace instead of taking the radio back out. Plus, the distance from plugging the RCA's from the Converter to the amp was a matter of inches. To connect to the factory speaker wiring, I used Scotchloks and tapped into the rear speaker wires. I bought the wiring kit with everything needed, including speaker wire, power wire, connections and RCA cables. "DS18 AK4 Complete 4 Gauge CCA Amplifier Installation Wiring Kit" Once everything was connected, I turned it on and immediate noticed the bass volume increase. The Subwoofer seemed to be distorted at low volume and I was unimpressed initially. I then took the time to set my "LPF" low pass frequency cutoff to as high as it would go..(I wanted the highest frequencies to be audible through the sub initially and it ended up being a good choice for my install. I've since adjusted the LPF to about 120hz. All reproduced frequencies sounded clear. The LPF is tunable from 40hz - 150hz max.) My gain is set to about 1/4 of the way up (3-4db) to match my stock components volume at near max volume. Bass Boost is something that made a big difference. Too much and it "farts". I set mine to a little less than half way. Also, I played with the phase button. Acoustically in my car, 180° activated seemed to make a big difference. Let me tell you..I am thoroughly impressed with the volume and sound of the Sub. I play every music style you can imagine from 90's hip hop, to Hard Rock, 80's, Jazz, Reggae, Metal and Classical. I spent a lot of time FINE tuning the "built in" amp and Small adjustments go a long way. Take your time and make those adjustments and you will be very happy. Just to note, I'm in my mid 40's and grew up installing stereo systems in my own jeeps, friends cars and trucks too. I have had systems with Orion XTR DVC 12" subs in a bandpass box to my most recent (2) 12" JL AUDIO 12w3 d4s in a ported box with Kenwood Excelon component speakers. No, this doesn't sound like those. It might not make your rear view mirror rattle but I didn't want that. Don't get me wrong, it is Loud but I simply wanted good bass in a small package to retain my trunk space. This Subwoofer far surpassed my expectations, especially since some of the reviews were so poor. Also, I installed it under my passenger seat "sideways" meaning the long way going left to right..connections facing the drivers seat, since it wouldn't fit under the driver side due to the electric motor. Again, i placed the amp sideways without any brackets and it stays put just fine. My only complaint is that the sub does not reproduce extremely low frequencies. If I had to guess, I would say 50hz and below..not a big deal. To me, this speaker sounds just as good as a quality (not top tier though) 10" Subwoofer installed in a sealed box with a dedicated amp. BTW, the way that I tuned this amp was with the supplied "remote" gain knob turned all the way up. This way I would know the max level before distortion and could manage my small adjustments from there. Installation, including removal of my factory radio took about 2.5 - 3 hours. Don't forget to take your time to tune it with small adjustments. Would buy again.
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Reviewed in the United States on October 1, 2023 by Bolt
Size: 10"
For the money, this is a very good system. Doesn't quite have the super deep base that shakes the neighbor's car. But it does have good sound. I will definitely upgrade when I have the money
Reviewed in the United States on April 7, 2026 by Michael
Size: 8"
Update: So I've had this dialed in for a couple months now. It's broken in and definitely adds a much greater depth to my sound system in my 2nd gen 4-door Tacoma with JBL system. There's limits due to the low power with the stock amp but at lower volumes the whole system can fill out deep bass that makes anything sound great, especially jazz or classic rock. If I want higher volume I need to dial down the bass a a bit. The remote control helps. I'm happy with it, but I still think I'll jump to the Rockville 10" by the end of the year so I can have more reliable deep bass at higher volumes. Original Review: -------------------------------------------- I am still working on dialing in the gain and bass boost on this, as well as my head unit settings, so this is a tentative 4 star given because this thing was cheap. I honestly expected a bit more from an 8" with a 100w rms and 400w max. Seems to me it should be able to handle a bit more bass at louder volumes without distorting. I have not been able to get a setting dialed in that can handle all music types well. If I turn the bass down to handle songs with heavy bass like hip hop and reggae, then there isn't much bass on some light rock Paul Simon or Fleetwood Mac or something. If I turn up the bass and those songs soung great, then the distortion hits when I go back to some deeper bass. It's annoying so far, but still got more settings to mess with and I do think I'll be able to get a 1-size-fits-all setting that will be moderate improvement for everything with a nice tight response. Sometimes I think I've got it and then the distortion hits. Maybe it needs to break in some more too. Either way, it has nice features. The remote is cool, as is the RCA inputs. It was easy to wire up and I have it sitting behind my backseat hidden and out of the way. No wires no box anywhere. All this being said, I will likely upgrade to the 10" eventually if I can talk my wife into taking this one for her car.
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Reviewed in the United States on December 21, 2023 by TC