Name: NVX NE121P
Brand: NVX
SKU: ne121p
Price: 136.95 USD
Availability: InStock
Rating: 3.5000 (2 reviews)

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Product highlights

• 12" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Internal box volume: 1.75 cubic feet
• Premium Black Carpet with Black NVX Logo

Learn more about the ne121p

Universal – fits most vehicles.

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$135.99

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Current Promotions (1 offer)

40% off a Sound Deadening Trunk Kit!

Get the most out of your Loaded Enclosure with the NVX SDTK20. Eliminates road noise, quiet vibrations, and increase the sound quality and output of audio system, 50%. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

NVX NE121P

https://images.sonicelectronix.com/images/5427831/main/sdtk20.jpg

40% off

NVX NE121P

$136 ⁹⁵

NVX SDTK20

$49 ⁹⁹

Priced separately $186 ⁹⁴

Promo Savings of $20 ⁰⁰

Total price:

$166 ⁹⁴

Product Highlights

• 12" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Internal box volume: 1.75 cubic feet
• Premium Black Carpet with Black NVX Logo

Description

Authorized dealer

Product Details:

Not compatible with NVX VC-Series Subwoofers
12" Single Ported Subwoofer Enclosure
Made from 3/4" Medium Density Fiberboard (MDF) construction
Built with precision CNC technology for exceptional accuracy
Pre-lined with Poly-Fil for improved acoustic response
Premium Black Carpet with Black NVX Logo
Spring Loaded Push Terminals
Maximum subwoofer mounting depth: 13-7/8"
Subwoofer cutout diameter: 11-7/32"
Internal box volume: 1.75 cubic feet
Dimensions: 16.50" D x 20.00" W x 16.00" H
Authorized Internet Dealer
1-year Sonic Electronix Warranty

Port Specifications:

Tuning Frequency: 38 Hz
Port Width: 1.5"
Port Height: 14.50"
Port Length: 17.52"

Product history:

	NVX NE121P (newest, current model)
	Atrend 12SQV (previous model, replaced by NVX NE121P)
	Ground Shaker SQP 1 12 (previous model, replaced by Atrend 12SQV)

Frequently Asked Questions (FAQ)

Why should I choose a sealed enclosure like the NE121P over its ported counterpart (NE121S)?

NE121P is great for peak SPL and room-shaking rumble. The ported slot releases air pressure and amplifies the low-end. This is ideal for large SUVs and trucks and when you want thunderous bass. However, if you want a tight bass, NE121S is the way to go.

Will a high-excursion 12" sub with a massive magnet hit the back panel of NE121P?

Most likely not. For example, the NE121P has a generous mounting depth of up to nearly 14". That’s enough clearance for even the beefiest competition-grade magnets to breathe without slamming against the rear wall.

My hip-hop tracks feel like they’re missing deep beats, sounding hollow. How does the NE121P help?

The slot port is tuned to 38Hz, which is the sweet spot for low-end extension. It uses the air inside the box to amplify the deepest notes, giving you that physical rumble that a sealed box just can't match at the same power level.

Can I add more Polyfill to the NE121P?

We don't recommend. NVX includes just enough to help the box act about 15-20% larger sound-wise. Adding too much can actually choke the sub's movement. Only add more if your sub's specs significantly exceed the box's actual internal volume.

What’s with the choice to build NE121P with rounded corners?

It’s for durability and fitment. Sharp MDF corners under carpet are prone to bruising or chipping during installation. Rounded edges prevent the carpet from tearing and make it much easier to slide the box into tight trunk gaps.

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Specifications & Details

Box/Enclosure specifications

Subwoofer Size

12"

Subwoofer Cutout Shape

Round / Circle

Box Type

Ported

Number of Subwoofers

Box Style/Shape

Square/Rectangle

Cutout Diameter or Length

11-7/32"

Maximum Speaker Depth

13-7/8"

Total Box Volume

1.75 cubic feet

Wood Thickness

3/4"

Number of Terminals

Terminal Type

Binding posts (banana clip ready)

Box Exterior Color

Black

Box Finish

Carpet

Tuning Frequency

38 Hz

Port Details

Number of Ports

Tuning Frequency

38 Hz

Port Diameter

1.5" x 14.50"

Port Length

17.52"

Warranty and Return Policy

Parts Warranty Duration

1 year

Labor Warranty Duration

1 year

Warranty Provider

Sonic Electronix

Customer Ratings & Reviews

Overall rating distribution

5 star		0%
4 star		50%
3 star		50%
2 star		0%
1 star		0%

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By feature average rating

Durability		3.5
Value		5
Features		5
Design		5
Usability		4

Customer Reviews

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Nice sounding box but abit tall.

Great sturdy box, carpeting was nicest done only thing i disliked about it was its hight it too tall my trunk is 14.75. But this thing is 16" tall had to cuz the foam that was under the mat to make it barely fit and also re.oved the back seat...it was worth it though, im running a rf-p3d2 12"

By robinson on February 27, 2026 Checkmark Icon

Verified purchase