Rockville SS8P 400 Review (Tried & Tested by Experts!)

I was looking to add a little more oomph to my car stereo, and after doing some research I decided that adding a powered subwoofer would be the way to go.

I didn’t want anything too big or bulky, so when I came across the Rockville SS8P 400 Watt Slim Under-Seat Powered Car/Truck Subwoofer Sub+Amp Kit, I knew it was exactly what I was looking for.

This subwoofer is compact and easy to install, yet it packs a powerful punch. In this review, I’ll share with you my experience with the Rockville SS8P and why I think it’s one of the best under-seat subwoofers on the market.

Rockville SS8P Review:

The Rockville SS8P 8-inch powered subwoofer kit is a solid choice if you want a powered sub that doesn’t require extra installation work.

The sub’s enclosure is well-designed and capable of withstanding a lot of abuse, and it offers enough features to make it worth the money.

The RMS power output is decent, but if you’d prefer a 400W peak rating, you can opt for the Rockville RWK10 400W amp kit instead.

The Rockville SS8P 8-inch subwoofer sub is perfect for any vehicle. The sound is clean and clear, and it pumps out a surprising amount of bass for its size and price. The built-in bass boost is a sweet feature, too.

The sub’s low notes are not overpowering, but they aren’t tinny. The bass boost feature gives an extra boost of bass, especially at lower volumes. The subwoofer operates on 100 watts, which can get loud, but bass isn’t muddy or distorted.

The bass boost setting adds a perceptible boost to the bass, but it’s subtle and won’t completely overwhelm the sound, so it won’t turn anyone off. The sub is compatible with most smartphones, and the large receiver is compact and portable.

Both the receiver and the subwoofer have a 3-foot power cord. The sub is 8.3 inches long, 11.4 inches wide, and 2.8 inches tall. It weighs 3 pounds.

The subwoofer is slim, so it fits easily under most seats, and it has rubber feet to keep it steady. The Rockville RWK10 is an extremely powerful amp, so you won’t need to upgrade it to drive this sub.

How We Pick & Tested Rockville SS8P Subwoofer?

  • Size matters: We looked for subwoofers that fit under most cars’ seats, and we tested them based on their ability to reproduce low bass notes.
  • Size matters, again: We wanted models that fit into most cars’ trunks or cargo areas, and we tested them based on their ability to reproduce high bass notes.
  • Sound quality: We listened to loud bass notes to determine how well the subwoofers reproduced them.
  • Portability: We looked for subwoofers with good ergonomics and a convenient handle.
  • Quality construction: We looked for subwoofers that had sturdy enclosures, good-quality speaker drivers, and user-accessible bass controls.
  • Portability: We looked for subwoofers with convenient handles.

Features We Like:

  • Built-In Variable Low Pass Filter
  • Built-In Phase Switch
  • Built-In Soft-Delayed Power On Circuit
  • Subsonic Filter
  • Built-In Bass Boost

Pros And Cons:



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About the product

Outputs: 2

This car subwoofer kit comes with everything you need to add some serious bass to your vehicle. It includes a powerful 400 watt amplifier and two 8″ subwoofers that can fit easily under your seat.

The slim design means that it won’t take up a lot of space, and the included wired remote allows you to control the volume from the driver’s seat.

Speaker Wiring: 17 RCA cables and 1 remote control cable

The RCA cables make sure that the speakers are getting power from the amplifier, and the remote control cable lets you control the volume from the comfort of your seat. This is a must-have feature for any under-seat subwoofer kit.

Frequency Response: 20Hz-150Hz

This car subwoofer has a frequency response of 20Hz-150Hz, meaning that it can reproduce sound frequencies in that range.

The highs will be clear and the lows will be pretty darn low. This is thanks to the 400 watt power output which gives this subwoofer plenty of oomph.

Sensitivity: 90dB @ 1w/1m

This car subwoofer has a sensitivity of 90dB @ 1w/1m, meaning that it is able to produce high-quality sound even at low volumes.

This is due to the fact that the SS8P subwoofer has a higher than average power output (400 watts), which allows it to reproduce sound more accurately than other similar models.

Dimensions (L x W x H): 11.4″x 8.3″x 2.8″ Inches

This subwoofer is powerful and slim, so it can easily fit under your seat without taking up a lot of space. The dimensions are just right for fitting into tight spaces. Plus, the 400 watt power means that this subwoofer pack a real punch when it comes to delivering deep bass sound.

Fuse Rating: Single 15A

This subwoofer is powerful and needs a good fuse rating to make sure it doesn’t damage your car. Single 15A is just the right amount of power for this bad boy.

Review and Score

Our Score: 89/100

I bought this subwoofer to add some extra bass to my car stereo and I’m very impressed with the results. This thing pounds hard, yet still sounds controlled and doesn’t get too muddy.

The install was pretty easy as well, although it did take a little bit of time to route all the wires neatly.

Overall, I’m very happy with this purchase and would recommend it to anyone looking for a quality under-seat subwoofer. Product: Rockville SS8P 400 Watt Slim Under-Seat Powered Car/Truck Subwoofer Sub+Amp Kit Rating: 89/100

Are rockville underseat subwoofer Worth It?

Are rockville underseat subwoofers worth it? In short, yes. If you’re looking for a quality underseat subwoofer that will provide great sound without breaking the bank, Rockville is a great option.

Rockville underseat subwoofers are known for their quality sound and reasonable price tag. If you’re looking for an underseat subwoofer that will add some serious thump to your music, Rockville is a great choice.

While there are more expensive options on the market, Rockville underseat subwoofers offer a great value for the price. If you’re looking for a quality underseat subwoofer that won’t break the bank, Rockville is worth considering.

Rockville SS8P 400 Is it any good?

The Rockville SS8P 400 is a great subwoofer. It’s very powerful and gives you a lot of bass. The only downside is that it’s a little bit expensive.

Overall, the SS8P 400 is a great subwoofer and I would recommend it to anyone looking for a powerful subwoofer.


All in all, the Rockville SS8P 400 Watt Slim Under-Seat Powered Car/Truck Subwoofer Sub+Amp Kit is a great component subwoofer kit that will give you plenty of bass without compromising space. It’s easy to install and provides good value for the money.

The Rockville SS8P is a great subwoofer for anyone looking for an upgrade. It offers a lot of features and a great sound quality. The only downside is the price, but it is worth it for the quality you get.

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