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Ground Shaker SQP 2 8

8" Dual Slot Ported/Vented Pro Subwoofer Enclosure


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This item has been discontinued

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Ground Shaker SQP 2 8

8" Dual Slot Ported/Vented Pro Subwoofer Enclosure


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High-Performance Streetwires Speaker Wire

25 ft. of 12 Gauge speaker cable with twisted pair construction for improved power flow and fine-stranded copper windings.


20 ft. of Dynamat Xtreme Trunk Kit

Keep your trunk from rattling and improve bass quality by using a sound dampening trunk kit.



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General Features:

  • 8" Dual Ported Subwoofer Enclosure
  • Subwoofer mounting depth: 11"
  • Durable 5/8" Medium Density Fiberboard (MDF) construction
  • Box volume: 0.62 cubic feet (per chamber)
  • Total box volume: 1.24 cubic feet
  • CARB compliant construction
  • Made in USA
  • Dimensions: 15-1/4"D x 28-1/4"W x 9-3/4"H
  • Authorized Internet Dealer
Also Found As: SQP28, SQP-28, SQP-2-8

Product History:

Ground Shaker SQP 2 8 thumbnail
(newest, current model)
Sonic Sub Boxes 2SV8-BLACK thumbnail
(previous model, replaced by Ground Shaker SQP 2 8)

Speaker Box / Enclosure Specifications

Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
Subwoofer Cutout Shape
This is the shape of the enclosures cutout hole and defines the style of subwoofer that can be installed.
Round / Circle
Box Type
Represents the style of the enclosure. Be sure to purchase the appropriate enclosure type and internal volume that will be compatible with your subwoofer's recommendation.

Sealed - Sealed boxes are those that have no holes or vents in it. The only hole in a sealed box is where the subwoofer is installed. Smaller sealed boxes require more power than a larger sealed box. They provide a tight, accurate bass, while the larger sealed enclosures provide a "boomier" and louder bass.

Ported / Vented - Ported/Vented Enclosures provide an even boomier, louder bass, but less accurate then a small, sealed box. Ported enclosures typically require more airspace per sub and also less power output from an amplifier to perform correctly.

Bandpass - Bandpass enclosures make subwoofers perform efficiently, but loose. The bass is not as "boomy" as a ported enclosure nor as punchy as a sealed enclosure. Bandpass enclosures work well with lower to mid-level subwoofers.
Vented / Ported
Number of Subs/Speakers
This value represents the number of speakers or subwoofers that the enclosure accommodates.
Box Style/Shape
The box style or shape refers to the actual shape of the box. Square and rectangular boxes are straight-edged boxes on all sides, whereas hatchback and truck style enclosures feature an angled front or back design that allows for installation in places short on depth such as single cab pickup trucks. You can also use such enclosures in hatchback cars or other vehicles where space is a premium. Tube and cylinder shaped boxes were made popular by Bazooka and are a great option for those looking for a nice amount of bass without sacrificing lots of space. They may even fit in locations that slim truck boxes cannot fit in. If the enclosure is vehicle specific, we encourage you to read the product description to find out which vehicles the enclosure is made for.
Maximum Speaker Depth
Your subwoofer or speaker must not exceed this dimension in order to properly mount in this enclosure.
Total Box Volume
The internal volume measurement in cubic feet before subwoofer magnet displacement.
0.62 cubic feet
Box Volume (Each Chamber)
This is the total air space inside each chamber of the empty subwoofer enclosure. By matching this value with the recommended air space of the subwoofer, you will be able to know if the subwoofer will match this box.
1.24 cubic feet
The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
Wood Thickness
The thickness of the wood the enclosure is made of, measured in inches.
Tuning Frequency
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.

Port Details

Number of Ports
The number of ports the enclosure has.
Tuning Frequency


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Warranty and Return Policy

Parts Warranty Duration
Not warranted
Labor Warranty Duration
Not warranted
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


El Paso, Texas

Well Built Enclosure, USA Quality

May 19, 2014

I have several Ground Shaker enclosures that I use for R&D. I am using the SQP 2 8 for a 7 inch 2 way speaker design. I build custom front plates to accommodate the drivers, and this price can't be beat for a .6 CF well made cabinet. I line the insides with carpet felt and add poly fill.

No resonances, perfect for design, they look and sound great.

10 of 18 found this helpful

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awesome box!

June 20, 2013

I put some sundown audio SA-8 V2's in this box assuming it wouldn't hold up but to my surprise the box has zero port noise and handles the sundown monsters great!

9 of 18 found this helpful

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Livermore, CA

When will prefab manufacturers get it right?

October 11, 2013

It's a nicely built box, but for newbies like me who are learning more and more about car audio each day, will soon understand that these prefabricated boxes are tuned hideously high. People use these boxes for subs, not tweeters. I had to give a friend the measurements to calculate the tuning because the manufacturer won't. I ended buying an Atrend 8DQV, same as this ground Shaker but larger, and my JL 8w3's hit slightly louder and deeper, which made a difference for me.

7 of 15 found this helpful

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Havre, MT

Not bad at all

December 31, 2013

First off just let me state that this box is "cute". That was the first thing my wife said upon me removing it for it's shipping container. The box was noticeably heavy and felt very well built.

I fitted 2 Skar SD-8 into the box with a little coercion. It was not an overly easy task. I had to notch out some extra space for the basket of the subs in order to get them to fit. And once they were anchored down, the box was almost tank like in weight.

The subs had already been broken in in another box so I was free to play. Listening to music the subs sounded good, after tweaking some settings I got them to sound great. They hit hard, fast, and relatively deep. They were out playing the 12" sub I just pulled from this vehicle.

Now it was time for the true test. I had procured a CD from the last local bass competition, it has several mixed tracks of boomy music and then goes on to a frequency sweep and then linear low frequency tones by track number. I started low at 20hz and was not disappointed, they are 8's after all, I didn't expect much but got more than foreseen. Skipping along and listening to every 3rd track, I kept getting more and more impressed. By the time I hit 44hz I was blown away. Now mind you I am not a huge fan of high playing sub/box combos but this is something absolutely awesome. I was having trouble focusing and talking to my buddy was not an option anymore. We both just grinned with delight. I have never owned 8's that could make me gasp, but in this box the impact was huge.

I may at some point get a larger ported box for these subs but at this point, this little tank of a box will do just fine. Overall I am very impressed.

9 of 20 found this helpful

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Sandy, UT


October 6, 2013

I was disappointed with this box. It looks good, but mine came with air leaks by the thin plastic terminals. It sounded awful until I sealed up the leaks with caulk. Another thing I noticed on my box was that a smudge of wood glue had been spilled onto the carpet leaving a yellowish dried blob. I will say it was decent sounding after the air leaks were fixed but not quite as good as I hoped.

7 of 16 found this helpful

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richmond ,ca

great product, for low price

August 26, 2013

I would proudly recommend this box, its well made, well designed and and like it says its a groundshaker!!!

7 of 17 found this helpful

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Accessory Tools and Products

Accessories added

NVX XKIT42 - 4 Gauge Amp Kit

Pure Virgin Copper, 4 Gauge Amplifier Installation Kit

Your Price $69.99

Belva BAK42 - 4 Gauge Amp Kit

CCA 4 Gauge Wiring Kit with RCA & Speaker Wire

Your Price $29.99

8 Gauge - Stinger Amp Kit

Single amplifier 4000 Series complete installation kit.

Your Price $49.99

High-Performance Streetwires Speaker Wire

25 ft. of 12 Gauge speaker cable with twisted pair construction for improved power flow and fine-stranded copper windings.

Your Price $44.95

20 ft. of Dynamat Xtreme Trunk Kit

Keep your trunk from rattling and improve bass quality by using a sound dampening trunk kit.

Your Price $94.95

NVX SDBP40 - 40 ft. (10% More Than Competition)

40 ft. Bulk Pack of Sound Dampening Material

Your Price $97.79

36 ft. of Dynamat Extreme Bulk Pack

Make your sound system sound perfect by reducing road noise with 9 sheets of sound dampening material.

Your Price $159.99

Banana Clip Terminals

These high grade banana clips allow you to plug into your banana clip ready terminal for a secure connection.

Your Price $1.99

Insulated Female Quick Disconnect Connectors

100 pack of 12-10 Gauge yellow insulated quick disconnects.

Your Price $8.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles or can be used for your polyfil.

Your Price $6.99

Car Stereo and Speaker / Subwoofer Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $16.99

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Product Summary


Model Number

SQP 2 8



Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Ground Shaker SQP 2 8